带有 UIBezierPath 的 CAShapeLayer 阴影
CAShapeLayer Shadow with UIBezierPath
这个问题从 继续。
我有以下 CAShapeLayer:
- (CAShapeLayer *)gaugeCircleLayer {
if (_gaugeCircleLayer == nil) {
_gaugeCircleLayer = [CAShapeLayer layer];
_gaugeCircleLayer.lineWidth = self.gaugeWidth;
_gaugeCircleLayer.fillColor = [UIColor clearColor].CGColor;
_gaugeCircleLayer.strokeColor = self.gaugeTintColor.CGColor;
_gaugeCircleLayer.strokeStart = 0.0f;
_gaugeCircleLayer.strokeEnd = self.value;
_gaugeCircleLayer.lineCap = kCALineCapRound;
_gaugeCircleLayer.path = [self insideCirclePath].CGPath;
CAShapeLayer *cap = [CAShapeLayer layer];
cap.shadowColor = [UIColor blackColor].CGColor;
cap.shadowRadius = 8.0;
cap.shadowOpacity = 0.9;
cap.shadowOffset = CGSizeMake(0, 0);
cap.fillColor = [UIColor grayColor].CGColor;
[_gaugeCircleLayer addSublayer:cap];
}
return _gaugeCircleLayer;
}
然后我有以下UIBezierPath：
- (UIBezierPath *)insideCirclePath {
CGPoint arcCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:arcCenter
radius:CGRectGetWidth(self.bounds) / 2.0f
startAngle:(3.0f * M_PI_2)
endAngle:(3.0f * M_PI_2) + (2.0f * M_PI)
clockwise:YES];
return path;
}
这会产生如下内容：
我想用 cap 子图层制作的是末尾的投影，我也很想知道如何让 GradientLayer 像下图一样工作：
问题是子层没有出现在任何地方，我不太清楚为什么。我也不是 100% 确定这是否是产生预期效果的最佳方式。
更新：
以下代码 ，但我不太确定如何将其正确添加到我的 UIBezierPath 中：
let cap = CAShapeLayer()
cap.shadowColor = UIColor.blackColor().CGColor
cap.shadowRadius = 8.0
cap.shadowOpacity = 0.9
cap.shadowOffset = CGSize(width: 0, height: 0)
cap.path = UIBezierPath(ovalInRect: CGRectMake(0, 40, 20, 20)).CGPath
cap.fillColor = UIColor.grayColor().CGColor
layer.addSublayer(cap)
这应该可以解决问题。
唯一剩下的问题是动画，帽子没有动画。
诀窍是将上限添加到仪表的末尾，并在仪表的值发生变化时更新它。为了计算位置，使用了一点数学魔法。它需要低于规格，因此在 trackCircleLayer
中添加了上限
//
// CHCircleGaugeView.m
//
// Copyright (c) 2014 ChaiOne <http://www.chaione.com/>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#import "CHCircleGaugeView.h"
#import "CHCircleGaugeViewDebugMacros.h"
#import <CoreText/CoreText.h>
#import <QuartzCore/QuartzCore.h>
static CGFloat const CHKeyAnimationDuration = 0.5f;
static CGFloat const CHKeyDefaultValue = 0.0f;
static CGFloat const CHKeyDefaultFontSize = 32.0f;
static CGFloat const CHKeyDefaultTrackWidth = 0.5f;
static CGFloat const CHKeyDefaultGaugeWidth = 2.0f;
static NSString * const CHKeyDefaultNAText = @"n/a";
static NSString * const CHKeyDefaultNoAnswersText = @"%";
#define CHKeyDefaultTrackTintColor [UIColor blackColor]
#define CHKeyDefaultGaugeTintColor [UIColor blackColor]
#define CHKeyDefaultTextColor [UIColor blackColor]
@interface CHCircleGaugeView ()
@property (nonatomic, strong) CAShapeLayer *trackCircleLayer;
@property (nonatomic, strong) CAShapeLayer *gaugeCircleLayer;
// ADDED
@property (nonatomic, strong) CAShapeLayer *capLayer;
// END ADDED
@property (nonatomic, strong) UILabel *valueTextLabel;
@end
@implementation CHCircleGaugeView
#pragma mark - View Initialization
- (instancetype)init {
return [self initWithFrame:CGRectZero];
}
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self initSetup];
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if (self) {
[self initSetup];
}
return self;
}
- (void)initSetup {
_state = CHCircleGaugeViewStateNA;
_value = CHKeyDefaultValue;
_trackTintColor = CHKeyDefaultTrackTintColor;
_gaugeTintColor = CHKeyDefaultGaugeTintColor;
_textColor = CHKeyDefaultTextColor;
_font = [UIFont systemFontOfSize:CHKeyDefaultFontSize];
_trackWidth = CHKeyDefaultTrackWidth;
_gaugeWidth = CHKeyDefaultGaugeWidth;
_notApplicableString = CHKeyDefaultNAText;
_noDataString = CHKeyDefaultNoAnswersText;
[self createGauge];
}
- (void)createGauge {
[self.layer addSublayer:self.trackCircleLayer];
[self.layer addSublayer:self.gaugeCircleLayer];
[self addSubview:self.valueTextLabel];
[self setupConstraints];
}
- (void)setupConstraints {
NSDictionary *viewDictionary = @{@"valueText" : self.valueTextLabel};
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[valueText]|" options:0 metrics:nil views:viewDictionary]];
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[valueText]|" options:0 metrics:nil views:viewDictionary]];
}
#pragma mark - Property Setters
- (void)setState:(CHCircleGaugeViewState)state {
if (_state != state) {
_state = state;
switch (state) {
case CHCircleGaugeViewStateNA: {
[self updateGaugeWithValue:0 animated:NO];
break;
}
case CHCircleGaugeViewStatePercentSign: {
[self updateGaugeWithValue:0 animated:NO];
break;
}
case CHCircleGaugeViewStateScore: {
[self updateGaugeWithValue:self.value animated:NO];
break;
}
default: {
ALog(@"Missing gauge state.");
break;
}
}
}
}
- (void)setValue:(CGFloat)value {
[self setValue:value animated:NO];
}
- (void)setValue:(CGFloat)value animated:(BOOL)animated {
self.state = CHCircleGaugeViewStateScore;
if (value != _value) {
[self willChangeValueForKey:NSStringFromSelector(@selector(value))];
value = MIN(1.0f, MAX(0.0f, value));
[self updateGaugeWithValue:value animated:animated];
_value = value;
[self didChangeValueForKey:NSStringFromSelector(@selector(value))];
}
}
- (void)setUnitsString:(NSString *)unitsString {
if ([_unitsString isEqualToString:unitsString] == NO) {
_unitsString = [unitsString copy];
self.valueTextLabel.attributedText = [self formattedStringForValue:self.value];
}
}
- (void)updateGaugeWithValue:(CGFloat)value animated:(BOOL)animated {
self.valueTextLabel.attributedText = [self formattedStringForValue:value];
BOOL previousDisableActionsValue = [CATransaction disableActions];
[CATransaction setDisableActions:YES];
self.gaugeCircleLayer.strokeEnd = value;
// ADDED
_capLayer.path = [self capPathForValue:value].CGPath;
// END ADDED
if (animated) {
self.gaugeCircleLayer.strokeEnd = value;
CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
pathAnimation.duration = CHKeyAnimationDuration;
pathAnimation.fromValue = [NSNumber numberWithFloat:self.value];
pathAnimation.toValue = [NSNumber numberWithFloat:value];
pathAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[self.gaugeCircleLayer addAnimation:pathAnimation forKey:@"strokeEndAnimation"];
}
[CATransaction setDisableActions:previousDisableActionsValue];
}
- (void)setTrackTintColor:(UIColor *)trackTintColor {
if (_trackTintColor != trackTintColor) {
_trackTintColor = trackTintColor;
self.trackCircleLayer.strokeColor = trackTintColor.CGColor;
}
}
- (void)setGaugeTintColor:(UIColor *)gaugeTintColor {
if (_gaugeTintColor != gaugeTintColor) {
_gaugeTintColor = gaugeTintColor;
self.gaugeCircleLayer.strokeColor = gaugeTintColor.CGColor;
// ADDED
self.capLayer.fillColor = gaugeTintColor.CGColor;
// END ADDED
}
}
- (void)setTrackWidth:(CGFloat)trackWidth {
if (_trackWidth != trackWidth) {
_trackWidth = trackWidth;
self.trackCircleLayer.lineWidth = trackWidth;
[self.layer layoutSublayers];
}
}
- (void)setGaugeWidth:(CGFloat)gaugeWidth {
if (_gaugeWidth != gaugeWidth) {
_gaugeWidth = gaugeWidth;
self.gaugeCircleLayer.lineWidth = gaugeWidth;
[self.layer layoutSublayers];
}
}
- (void)setTextColor:(UIColor *)textColor {
if (_textColor != textColor) {
_textColor = textColor;
self.valueTextLabel.textColor = textColor;
}
}
- (void)setFont:(UIFont *)font {
if (_font != font) {
_font = font;
self.valueTextLabel.font = font;
}
}
- (void)setGaugeStyle:(CHCircleGaugeStyle)gaugeStyle {
if (_gaugeStyle != gaugeStyle) {
_gaugeStyle = gaugeStyle;
[self.layer layoutSublayers];
}
}
#pragma mark - Circle Shapes
- (CAShapeLayer *)trackCircleLayer {
if (_trackCircleLayer == nil) {
_trackCircleLayer = [CAShapeLayer layer];
_trackCircleLayer.lineWidth = self.trackWidth;
_trackCircleLayer.fillColor = [UIColor clearColor].CGColor;
_trackCircleLayer.strokeColor = self.trackTintColor.CGColor;
_trackCircleLayer.path = [self insideCirclePath].CGPath;
// ADDED
_capLayer = [CAShapeLayer layer];
_capLayer.shadowColor = [UIColor blackColor].CGColor;
_capLayer.shadowRadius = 8.0;
_capLayer.shadowOpacity = 0.9;
_capLayer.shadowOffset = CGSizeMake(0, 0);
_capLayer.fillColor = self.gaugeTintColor.CGColor;
_capLayer.path = [self capPathForValue:self.value].CGPath;
[_trackCircleLayer addSublayer:_capLayer];
// END ADDED
}
return _trackCircleLayer;
}
- (CAShapeLayer *)gaugeCircleLayer {
if (_gaugeCircleLayer == nil) {
_gaugeCircleLayer = [CAShapeLayer layer];
_gaugeCircleLayer.lineWidth = self.gaugeWidth;
_gaugeCircleLayer.fillColor = [UIColor clearColor].CGColor;
_gaugeCircleLayer.strokeColor = self.gaugeTintColor.CGColor;
_gaugeCircleLayer.strokeStart = 0.0f;
_gaugeCircleLayer.strokeEnd = self.value;
_gaugeCircleLayer.path = [self circlPathForCurrentGaugeStyle].CGPath;
}
return _gaugeCircleLayer;
}
// ADDED
- (UIBezierPath *)capPathForValue:(float)value {
CGPoint arcCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
CGFloat radius = CGRectGetWidth(self.bounds) / 2.0f;
float angle = value * 360.0;
float x = radius * sin(angle*M_PI/180.0);
float y = radius * cos(angle*M_PI/180.0);
CGPoint capArcCenter = CGPointMake(arcCenter.x + x, arcCenter.y - y);
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:capArcCenter
radius:self.gaugeWidth*_capLayer.shadowRadius / 2.0f
startAngle:(3.0f * M_PI_2)
endAngle:(3.0f * M_PI_2) + (2.0f * M_PI)
clockwise:YES];
return path;
}
// END ADDED
- (UIBezierPath *)circlPathForCurrentGaugeStyle {
switch (self.gaugeStyle) {
case CHCircleGaugeStyleInside: {
return [self insideCirclePath];
}
case CHCircleGaugeStyleOutside: {
return [self outsideCirclePath];
}
default: {
return nil;
}
}
}
- (UIBezierPath *)insideCirclePath {
CGPoint arcCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:arcCenter
radius:CGRectGetWidth(self.bounds) / 2.0f
startAngle:(3.0f * M_PI_2)
endAngle:(3.0f * M_PI_2) + (2.0f * M_PI)
clockwise:YES];
return path;
}
- (UIBezierPath *)outsideCirclePath {
CGPoint arcCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
CGFloat radius = (CGRectGetWidth(self.bounds) / 2.0f) + (self.trackWidth / 2.0f) + (self.gaugeWidth / 2.0f);
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:arcCenter
radius:radius
startAngle:(3.0f * M_PI_2)
endAngle:(3.0f * M_PI_2) + (2.0f * M_PI)
clockwise:YES];
return path;
}
#pragma mark - Text Label
- (UILabel *)valueTextLabel {
if (_valueTextLabel == nil) {
_valueTextLabel = [[UILabel alloc] init];
[_valueTextLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
_valueTextLabel.textAlignment = NSTextAlignmentCenter;
_valueTextLabel.attributedText = [self formattedStringForValue:self.value];
}
return _valueTextLabel;
}
- (NSAttributedString *)formattedStringForValue:(CGFloat)value {
NSAttributedString *valueString;
NSDictionary *stringAttributes = @{
NSForegroundColorAttributeName : self.textColor,
NSFontAttributeName : self.font
};
switch (self.state) {
case CHCircleGaugeViewStateNA: {
valueString = [[NSAttributedString alloc] initWithString:self.notApplicableString attributes:stringAttributes];
break;
}
case CHCircleGaugeViewStatePercentSign: {
valueString = [[NSAttributedString alloc] initWithString:self.noDataString attributes:stringAttributes];
break;
}
case CHCircleGaugeViewStateScore: {
NSString *suffix = self.unitsString ? self.unitsString : @"";
valueString = [[NSAttributedString alloc] initWithString:[NSString stringWithFormat:@"%.0f %@", value * 100.0f, suffix]
attributes:stringAttributes];
break;
}
default: {
ALog(@"Missing gauge state.");
break;
}
}
return valueString;
}
#pragma mark - KVO
// Handling KVO notifications for the value property, since
// we're proxying with the setValue:animated: method.
+ (BOOL)automaticallyNotifiesObserversForKey:(NSString *)key {
if ([key isEqualToString:NSStringFromSelector(@selector(value))]) {
return NO;
} else {
return [super automaticallyNotifiesObserversForKey:key];
}
}
#pragma mark - CALayerDelegate
- (void)layoutSublayersOfLayer:(CALayer *)layer {
[super layoutSublayersOfLayer:layer];
if (layer == self.layer) {
self.trackCircleLayer.path = [self insideCirclePath].CGPath;
self.gaugeCircleLayer.path = [self circlPathForCurrentGaugeStyle].CGPath;
}
}
@end
我不知道这对您是否有用，因为它不使用 CHCircleGaugeView。我正在处理与这个问题相关的几个项目，所以我将它们混合在一起并进行了一些更改以生成一个进度视图，该视图具有颜色渐变背景，其尖端与末端 100% 重叠。我还没有达到让圆形尖端在 0% 时消失的地步，但我最终会到达那里。以下是在 2 个不同的进度级别上对它的一些看法，
视图是使用在 drawRect 中绘制的极坐标渐变创建的，由圆环遮盖。圆形尖端是一个单独的层，它是连接到圆心的直线末端的半圆，圆心围绕其中心旋转，并根据进度水平进行变换。这是代码，
@implementation AnnulusProgressView{ // subclass of UIView
int slices;
CGFloat circleRadius;
CAShapeLayer *maskLayer;
CGFloat segmentAngle;
CGFloat startAngle;
CAShapeLayer *tipView;
NSMutableArray *colors;
int sign;
}
-(instancetype)initWithFrame:(CGRect)frame wantsBackgroundRing:(BOOL)wantsBackground backgroundRingColor:(UIColor *)ringColor {
if (self = [super initWithFrame:frame]) {
slices = 360;
_ringThickness = 12;
circleRadius = self.bounds.size.width/2;
_startColor = [UIColor colorWithHue:0.24 saturation:1 brightness:0.8 alpha:1];
_endColor = [UIColor colorWithHue:0.03 saturation:1 brightness:1 alpha:1];
[self setupColorArray];
_backgroundRing = wantsBackground? [self createBackgroundRingWithColor:ringColor] : nil;
self.layer.mask = [self createAnnulusMask];
}
return self;
}
-(void)setStartColor:(UIColor *)startColor {
_startColor = startColor;
[self setupColorArray];
}
-(void)setEndColor:(UIColor *)endColor {
_endColor = endColor;
[self setupColorArray];
}
-(void)setupColorArray {
colors = [NSMutableArray new];
CGFloat startHue, startSaturation, startBrightness, startAlpha, endHue, endSaturation, endBrightness, endAlpha;
[self.startColor getHue:&startHue saturation:&startSaturation brightness:&startBrightness alpha:&startAlpha];
[self.endColor getHue:&endHue saturation:&endSaturation brightness:&endBrightness alpha:&endAlpha];
for(int i=0;i<slices;i++){
CGFloat hue = startHue + (endHue - startHue)*i/slices;
CGFloat brightness = startBrightness + (endBrightness - startBrightness)*i/slices;
CGFloat saturation = startSaturation + (endSaturation - startSaturation)*i/slices;
CGFloat alpha = startAlpha + (endAlpha - startAlpha)*i/slices;
UIColor *color = [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:alpha];
[colors addObject:color];
}
self.progress = _progress;
}
-(UIView *)createBackgroundRingWithColor:(UIColor *) color {
UIView *bgRing = [[UIView alloc] initWithFrame:self.frame];
bgRing.backgroundColor = color;
bgRing.layer.mask = [self createAnnulusMask];
[(CAShapeLayer *)bgRing.layer.mask setStrokeEnd:startAngle + 2*M_PI ];
return bgRing;
}
-(void)didMoveToSuperview {
if (self.backgroundRing) [self.superview insertSubview:self.backgroundRing belowSubview:self];
tipView = [self tipView];
[self.superview.layer addSublayer:tipView];
}
-(CAShapeLayer *)tipView {
CAShapeLayer *tip = [CAShapeLayer layer];
tip.frame = self.frame;
tip.fillColor = [UIColor redColor].CGColor;
UIBezierPath *shape = [UIBezierPath bezierPath];
CGPoint center = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
[shape moveToPoint:center];
CGPoint bottomPoint = CGPointMake(center.x, center.y + circleRadius - self.ringThickness*2);
CGFloat tipCenterY = bottomPoint.y + self.ringThickness - 1;
[shape addLineToPoint: bottomPoint];
[shape addLineToPoint:CGPointMake(bottomPoint.x+2, bottomPoint.y)];
double fractionAlongTangent = self.ringThickness;
[shape addCurveToPoint:CGPointMake(center.x, center.y + circleRadius) controlPoint1:CGPointMake(center.x - self.ringThickness*1.5, tipCenterY - fractionAlongTangent) controlPoint2:CGPointMake(center.x - self.ringThickness*1.5, tipCenterY + fractionAlongTangent)];
[shape closePath];
tip.path = shape.CGPath;
tip.shadowColor = [UIColor darkGrayColor].CGColor;
tip.shadowOpacity = 0.8;
tip.shadowOffset = CGSizeMake(-6, 0);
tip.shadowRadius = 2;
return tip;
}
- (void)setProgress:(CGFloat)progress{
sign = (progress >= _progress)? 1 : -1;
[self animateProgressTo:@(progress)];
}
-(void)animateProgressTo:(NSNumber *) newValueNumber{
float newValue = newValueNumber.floatValue;
_progress = (_progress + (sign * 0.1) > 1)? 1 : _progress + (sign * 0.1);
if ((_progress > newValue && sign == 1) || (_progress < newValue && sign == -1)) {
_progress = newValue;
}
maskLayer.strokeEnd = _progress;
tipView.transform = CATransform3DMakeRotation(-(1 - _progress + 0.002) * M_PI*2, 0, 0, 1); //the 0.002 closes a small gap between the tip and the annulus strokeEnd
int i = (int)(_progress*(slices - 1));
tipView.fillColor = ((UIColor *)colors[i]).CGColor;
if (sign == 1) {
if (_progress < newValue) {
[self performSelector:@selector(animateProgressTo:) withObject:@(newValue) afterDelay:0.05];
}
}else{
if (_progress > newValue) {
[self performSelector:@selector(animateProgressTo:) withObject:@(newValue) afterDelay:0.05];
}
}
NSLog(@"%f",_progress);
}
- (CAShapeLayer *)createAnnulusMask {
maskLayer = [CAShapeLayer layer];
maskLayer.frame = self.bounds;
segmentAngle = 2*M_PI/(slices);
startAngle = M_PI_2;
CGFloat endAngle = startAngle + 2*M_PI;
maskLayer.path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds)) radius:circleRadius - self.ringThickness startAngle:startAngle endAngle:endAngle clockwise:YES].CGPath;
maskLayer.fillColor = [UIColor clearColor].CGColor;
maskLayer.strokeColor = [UIColor blackColor].CGColor;
maskLayer.lineWidth = self.ringThickness * 2;
maskLayer.strokeEnd = self.progress;
return maskLayer;
}
-(void)drawRect:(CGRect)rect{
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetAllowsAntialiasing(ctx, NO);
CGPoint center = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
for(int i=0;i<slices;i++){
CGContextSaveGState(ctx);
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:center];
[path addArcWithCenter:center radius:circleRadius startAngle:startAngle endAngle:startAngle+segmentAngle clockwise:YES];
[path addClip];
[colors[i] setFill];
[path fill];
CGContextRestoreGState(ctx);
startAngle += segmentAngle;
}
}
这个问题从
我有以下 CAShapeLayer:
- (CAShapeLayer *)gaugeCircleLayer {
if (_gaugeCircleLayer == nil) {
_gaugeCircleLayer = [CAShapeLayer layer];
_gaugeCircleLayer.lineWidth = self.gaugeWidth;
_gaugeCircleLayer.fillColor = [UIColor clearColor].CGColor;
_gaugeCircleLayer.strokeColor = self.gaugeTintColor.CGColor;
_gaugeCircleLayer.strokeStart = 0.0f;
_gaugeCircleLayer.strokeEnd = self.value;
_gaugeCircleLayer.lineCap = kCALineCapRound;
_gaugeCircleLayer.path = [self insideCirclePath].CGPath;
CAShapeLayer *cap = [CAShapeLayer layer];
cap.shadowColor = [UIColor blackColor].CGColor;
cap.shadowRadius = 8.0;
cap.shadowOpacity = 0.9;
cap.shadowOffset = CGSizeMake(0, 0);
cap.fillColor = [UIColor grayColor].CGColor;
[_gaugeCircleLayer addSublayer:cap];
}
return _gaugeCircleLayer;
}
然后我有以下UIBezierPath：
- (UIBezierPath *)insideCirclePath {
CGPoint arcCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:arcCenter
radius:CGRectGetWidth(self.bounds) / 2.0f
startAngle:(3.0f * M_PI_2)
endAngle:(3.0f * M_PI_2) + (2.0f * M_PI)
clockwise:YES];
return path;
}
这会产生如下内容：
我想用 cap 子图层制作的是末尾的投影，我也很想知道如何让 GradientLayer 像下图一样工作：
问题是子层没有出现在任何地方，我不太清楚为什么。我也不是 100% 确定这是否是产生预期效果的最佳方式。
更新：
以下代码 UIBezierPath 中：
let cap = CAShapeLayer()
cap.shadowColor = UIColor.blackColor().CGColor
cap.shadowRadius = 8.0
cap.shadowOpacity = 0.9
cap.shadowOffset = CGSize(width: 0, height: 0)
cap.path = UIBezierPath(ovalInRect: CGRectMake(0, 40, 20, 20)).CGPath
cap.fillColor = UIColor.grayColor().CGColor
layer.addSublayer(cap)
这应该可以解决问题。
唯一剩下的问题是动画，帽子没有动画。
诀窍是将上限添加到仪表的末尾，并在仪表的值发生变化时更新它。为了计算位置，使用了一点数学魔法。它需要低于规格，因此在 trackCircleLayer
//
// CHCircleGaugeView.m
//
// Copyright (c) 2014 ChaiOne <http://www.chaione.com/>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#import "CHCircleGaugeView.h"
#import "CHCircleGaugeViewDebugMacros.h"
#import <CoreText/CoreText.h>
#import <QuartzCore/QuartzCore.h>
static CGFloat const CHKeyAnimationDuration = 0.5f;
static CGFloat const CHKeyDefaultValue = 0.0f;
static CGFloat const CHKeyDefaultFontSize = 32.0f;
static CGFloat const CHKeyDefaultTrackWidth = 0.5f;
static CGFloat const CHKeyDefaultGaugeWidth = 2.0f;
static NSString * const CHKeyDefaultNAText = @"n/a";
static NSString * const CHKeyDefaultNoAnswersText = @"%";
#define CHKeyDefaultTrackTintColor [UIColor blackColor]
#define CHKeyDefaultGaugeTintColor [UIColor blackColor]
#define CHKeyDefaultTextColor [UIColor blackColor]
@interface CHCircleGaugeView ()
@property (nonatomic, strong) CAShapeLayer *trackCircleLayer;
@property (nonatomic, strong) CAShapeLayer *gaugeCircleLayer;
// ADDED
@property (nonatomic, strong) CAShapeLayer *capLayer;
// END ADDED
@property (nonatomic, strong) UILabel *valueTextLabel;
@end
@implementation CHCircleGaugeView
#pragma mark - View Initialization
- (instancetype)init {
return [self initWithFrame:CGRectZero];
}
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self initSetup];
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if (self) {
[self initSetup];
}
return self;
}
- (void)initSetup {
_state = CHCircleGaugeViewStateNA;
_value = CHKeyDefaultValue;
_trackTintColor = CHKeyDefaultTrackTintColor;
_gaugeTintColor = CHKeyDefaultGaugeTintColor;
_textColor = CHKeyDefaultTextColor;
_font = [UIFont systemFontOfSize:CHKeyDefaultFontSize];
_trackWidth = CHKeyDefaultTrackWidth;
_gaugeWidth = CHKeyDefaultGaugeWidth;
_notApplicableString = CHKeyDefaultNAText;
_noDataString = CHKeyDefaultNoAnswersText;
[self createGauge];
}
- (void)createGauge {
[self.layer addSublayer:self.trackCircleLayer];
[self.layer addSublayer:self.gaugeCircleLayer];
[self addSubview:self.valueTextLabel];
[self setupConstraints];
}
- (void)setupConstraints {
NSDictionary *viewDictionary = @{@"valueText" : self.valueTextLabel};
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[valueText]|" options:0 metrics:nil views:viewDictionary]];
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[valueText]|" options:0 metrics:nil views:viewDictionary]];
}
#pragma mark - Property Setters
- (void)setState:(CHCircleGaugeViewState)state {
if (_state != state) {
_state = state;
switch (state) {
case CHCircleGaugeViewStateNA: {
[self updateGaugeWithValue:0 animated:NO];
break;
}
case CHCircleGaugeViewStatePercentSign: {
[self updateGaugeWithValue:0 animated:NO];
break;
}
case CHCircleGaugeViewStateScore: {
[self updateGaugeWithValue:self.value animated:NO];
break;
}
default: {
ALog(@"Missing gauge state.");
break;
}
}
}
}
- (void)setValue:(CGFloat)value {
[self setValue:value animated:NO];
}
- (void)setValue:(CGFloat)value animated:(BOOL)animated {
self.state = CHCircleGaugeViewStateScore;
if (value != _value) {
[self willChangeValueForKey:NSStringFromSelector(@selector(value))];
value = MIN(1.0f, MAX(0.0f, value));
[self updateGaugeWithValue:value animated:animated];
_value = value;
[self didChangeValueForKey:NSStringFromSelector(@selector(value))];
}
}
- (void)setUnitsString:(NSString *)unitsString {
if ([_unitsString isEqualToString:unitsString] == NO) {
_unitsString = [unitsString copy];
self.valueTextLabel.attributedText = [self formattedStringForValue:self.value];
}
}
- (void)updateGaugeWithValue:(CGFloat)value animated:(BOOL)animated {
self.valueTextLabel.attributedText = [self formattedStringForValue:value];
BOOL previousDisableActionsValue = [CATransaction disableActions];
[CATransaction setDisableActions:YES];
self.gaugeCircleLayer.strokeEnd = value;
// ADDED
_capLayer.path = [self capPathForValue:value].CGPath;
// END ADDED
if (animated) {
self.gaugeCircleLayer.strokeEnd = value;
CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
pathAnimation.duration = CHKeyAnimationDuration;
pathAnimation.fromValue = [NSNumber numberWithFloat:self.value];
pathAnimation.toValue = [NSNumber numberWithFloat:value];
pathAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[self.gaugeCircleLayer addAnimation:pathAnimation forKey:@"strokeEndAnimation"];
}
[CATransaction setDisableActions:previousDisableActionsValue];
}
- (void)setTrackTintColor:(UIColor *)trackTintColor {
if (_trackTintColor != trackTintColor) {
_trackTintColor = trackTintColor;
self.trackCircleLayer.strokeColor = trackTintColor.CGColor;
}
}
- (void)setGaugeTintColor:(UIColor *)gaugeTintColor {
if (_gaugeTintColor != gaugeTintColor) {
_gaugeTintColor = gaugeTintColor;
self.gaugeCircleLayer.strokeColor = gaugeTintColor.CGColor;
// ADDED
self.capLayer.fillColor = gaugeTintColor.CGColor;
// END ADDED
}
}
- (void)setTrackWidth:(CGFloat)trackWidth {
if (_trackWidth != trackWidth) {
_trackWidth = trackWidth;
self.trackCircleLayer.lineWidth = trackWidth;
[self.layer layoutSublayers];
}
}
- (void)setGaugeWidth:(CGFloat)gaugeWidth {
if (_gaugeWidth != gaugeWidth) {
_gaugeWidth = gaugeWidth;
self.gaugeCircleLayer.lineWidth = gaugeWidth;
[self.layer layoutSublayers];
}
}
- (void)setTextColor:(UIColor *)textColor {
if (_textColor != textColor) {
_textColor = textColor;
self.valueTextLabel.textColor = textColor;
}
}
- (void)setFont:(UIFont *)font {
if (_font != font) {
_font = font;
self.valueTextLabel.font = font;
}
}
- (void)setGaugeStyle:(CHCircleGaugeStyle)gaugeStyle {
if (_gaugeStyle != gaugeStyle) {
_gaugeStyle = gaugeStyle;
[self.layer layoutSublayers];
}
}
#pragma mark - Circle Shapes
- (CAShapeLayer *)trackCircleLayer {
if (_trackCircleLayer == nil) {
_trackCircleLayer = [CAShapeLayer layer];
_trackCircleLayer.lineWidth = self.trackWidth;
_trackCircleLayer.fillColor = [UIColor clearColor].CGColor;
_trackCircleLayer.strokeColor = self.trackTintColor.CGColor;
_trackCircleLayer.path = [self insideCirclePath].CGPath;
// ADDED
_capLayer = [CAShapeLayer layer];
_capLayer.shadowColor = [UIColor blackColor].CGColor;
_capLayer.shadowRadius = 8.0;
_capLayer.shadowOpacity = 0.9;
_capLayer.shadowOffset = CGSizeMake(0, 0);
_capLayer.fillColor = self.gaugeTintColor.CGColor;
_capLayer.path = [self capPathForValue:self.value].CGPath;
[_trackCircleLayer addSublayer:_capLayer];
// END ADDED
}
return _trackCircleLayer;
}
- (CAShapeLayer *)gaugeCircleLayer {
if (_gaugeCircleLayer == nil) {
_gaugeCircleLayer = [CAShapeLayer layer];
_gaugeCircleLayer.lineWidth = self.gaugeWidth;
_gaugeCircleLayer.fillColor = [UIColor clearColor].CGColor;
_gaugeCircleLayer.strokeColor = self.gaugeTintColor.CGColor;
_gaugeCircleLayer.strokeStart = 0.0f;
_gaugeCircleLayer.strokeEnd = self.value;
_gaugeCircleLayer.path = [self circlPathForCurrentGaugeStyle].CGPath;
}
return _gaugeCircleLayer;
}
// ADDED
- (UIBezierPath *)capPathForValue:(float)value {
CGPoint arcCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
CGFloat radius = CGRectGetWidth(self.bounds) / 2.0f;
float angle = value * 360.0;
float x = radius * sin(angle*M_PI/180.0);
float y = radius * cos(angle*M_PI/180.0);
CGPoint capArcCenter = CGPointMake(arcCenter.x + x, arcCenter.y - y);
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:capArcCenter
radius:self.gaugeWidth*_capLayer.shadowRadius / 2.0f
startAngle:(3.0f * M_PI_2)
endAngle:(3.0f * M_PI_2) + (2.0f * M_PI)
clockwise:YES];
return path;
}
// END ADDED
- (UIBezierPath *)circlPathForCurrentGaugeStyle {
switch (self.gaugeStyle) {
case CHCircleGaugeStyleInside: {
return [self insideCirclePath];
}
case CHCircleGaugeStyleOutside: {
return [self outsideCirclePath];
}
default: {
return nil;
}
}
}
- (UIBezierPath *)insideCirclePath {
CGPoint arcCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:arcCenter
radius:CGRectGetWidth(self.bounds) / 2.0f
startAngle:(3.0f * M_PI_2)
endAngle:(3.0f * M_PI_2) + (2.0f * M_PI)
clockwise:YES];
return path;
}
- (UIBezierPath *)outsideCirclePath {
CGPoint arcCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
CGFloat radius = (CGRectGetWidth(self.bounds) / 2.0f) + (self.trackWidth / 2.0f) + (self.gaugeWidth / 2.0f);
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:arcCenter
radius:radius
startAngle:(3.0f * M_PI_2)
endAngle:(3.0f * M_PI_2) + (2.0f * M_PI)
clockwise:YES];
return path;
}
#pragma mark - Text Label
- (UILabel *)valueTextLabel {
if (_valueTextLabel == nil) {
_valueTextLabel = [[UILabel alloc] init];
[_valueTextLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
_valueTextLabel.textAlignment = NSTextAlignmentCenter;
_valueTextLabel.attributedText = [self formattedStringForValue:self.value];
}
return _valueTextLabel;
}
- (NSAttributedString *)formattedStringForValue:(CGFloat)value {
NSAttributedString *valueString;
NSDictionary *stringAttributes = @{
NSForegroundColorAttributeName : self.textColor,
NSFontAttributeName : self.font
};
switch (self.state) {
case CHCircleGaugeViewStateNA: {
valueString = [[NSAttributedString alloc] initWithString:self.notApplicableString attributes:stringAttributes];
break;
}
case CHCircleGaugeViewStatePercentSign: {
valueString = [[NSAttributedString alloc] initWithString:self.noDataString attributes:stringAttributes];
break;
}
case CHCircleGaugeViewStateScore: {
NSString *suffix = self.unitsString ? self.unitsString : @"";
valueString = [[NSAttributedString alloc] initWithString:[NSString stringWithFormat:@"%.0f %@", value * 100.0f, suffix]
attributes:stringAttributes];
break;
}
default: {
ALog(@"Missing gauge state.");
break;
}
}
return valueString;
}
#pragma mark - KVO
// Handling KVO notifications for the value property, since
// we're proxying with the setValue:animated: method.
+ (BOOL)automaticallyNotifiesObserversForKey:(NSString *)key {
if ([key isEqualToString:NSStringFromSelector(@selector(value))]) {
return NO;
} else {
return [super automaticallyNotifiesObserversForKey:key];
}
}
#pragma mark - CALayerDelegate
- (void)layoutSublayersOfLayer:(CALayer *)layer {
[super layoutSublayersOfLayer:layer];
if (layer == self.layer) {
self.trackCircleLayer.path = [self insideCirclePath].CGPath;
self.gaugeCircleLayer.path = [self circlPathForCurrentGaugeStyle].CGPath;
}
}
@end
我不知道这对您是否有用，因为它不使用 CHCircleGaugeView。我正在处理与这个问题相关的几个项目，所以我将它们混合在一起并进行了一些更改以生成一个进度视图，该视图具有颜色渐变背景，其尖端与末端 100% 重叠。我还没有达到让圆形尖端在 0% 时消失的地步，但我最终会到达那里。以下是在 2 个不同的进度级别上对它的一些看法，
视图是使用在 drawRect 中绘制的极坐标渐变创建的，由圆环遮盖。圆形尖端是一个单独的层，它是连接到圆心的直线末端的半圆，圆心围绕其中心旋转，并根据进度水平进行变换。这是代码，
@implementation AnnulusProgressView{ // subclass of UIView
int slices;
CGFloat circleRadius;
CAShapeLayer *maskLayer;
CGFloat segmentAngle;
CGFloat startAngle;
CAShapeLayer *tipView;
NSMutableArray *colors;
int sign;
}
-(instancetype)initWithFrame:(CGRect)frame wantsBackgroundRing:(BOOL)wantsBackground backgroundRingColor:(UIColor *)ringColor {
if (self = [super initWithFrame:frame]) {
slices = 360;
_ringThickness = 12;
circleRadius = self.bounds.size.width/2;
_startColor = [UIColor colorWithHue:0.24 saturation:1 brightness:0.8 alpha:1];
_endColor = [UIColor colorWithHue:0.03 saturation:1 brightness:1 alpha:1];
[self setupColorArray];
_backgroundRing = wantsBackground? [self createBackgroundRingWithColor:ringColor] : nil;
self.layer.mask = [self createAnnulusMask];
}
return self;
}
-(void)setStartColor:(UIColor *)startColor {
_startColor = startColor;
[self setupColorArray];
}
-(void)setEndColor:(UIColor *)endColor {
_endColor = endColor;
[self setupColorArray];
}
-(void)setupColorArray {
colors = [NSMutableArray new];
CGFloat startHue, startSaturation, startBrightness, startAlpha, endHue, endSaturation, endBrightness, endAlpha;
[self.startColor getHue:&startHue saturation:&startSaturation brightness:&startBrightness alpha:&startAlpha];
[self.endColor getHue:&endHue saturation:&endSaturation brightness:&endBrightness alpha:&endAlpha];
for(int i=0;i<slices;i++){
CGFloat hue = startHue + (endHue - startHue)*i/slices;
CGFloat brightness = startBrightness + (endBrightness - startBrightness)*i/slices;
CGFloat saturation = startSaturation + (endSaturation - startSaturation)*i/slices;
CGFloat alpha = startAlpha + (endAlpha - startAlpha)*i/slices;
UIColor *color = [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:alpha];
[colors addObject:color];
}
self.progress = _progress;
}
-(UIView *)createBackgroundRingWithColor:(UIColor *) color {
UIView *bgRing = [[UIView alloc] initWithFrame:self.frame];
bgRing.backgroundColor = color;
bgRing.layer.mask = [self createAnnulusMask];
[(CAShapeLayer *)bgRing.layer.mask setStrokeEnd:startAngle + 2*M_PI ];
return bgRing;
}
-(void)didMoveToSuperview {
if (self.backgroundRing) [self.superview insertSubview:self.backgroundRing belowSubview:self];
tipView = [self tipView];
[self.superview.layer addSublayer:tipView];
}
-(CAShapeLayer *)tipView {
CAShapeLayer *tip = [CAShapeLayer layer];
tip.frame = self.frame;
tip.fillColor = [UIColor redColor].CGColor;
UIBezierPath *shape = [UIBezierPath bezierPath];
CGPoint center = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
[shape moveToPoint:center];
CGPoint bottomPoint = CGPointMake(center.x, center.y + circleRadius - self.ringThickness*2);
CGFloat tipCenterY = bottomPoint.y + self.ringThickness - 1;
[shape addLineToPoint: bottomPoint];
[shape addLineToPoint:CGPointMake(bottomPoint.x+2, bottomPoint.y)];
double fractionAlongTangent = self.ringThickness;
[shape addCurveToPoint:CGPointMake(center.x, center.y + circleRadius) controlPoint1:CGPointMake(center.x - self.ringThickness*1.5, tipCenterY - fractionAlongTangent) controlPoint2:CGPointMake(center.x - self.ringThickness*1.5, tipCenterY + fractionAlongTangent)];
[shape closePath];
tip.path = shape.CGPath;
tip.shadowColor = [UIColor darkGrayColor].CGColor;
tip.shadowOpacity = 0.8;
tip.shadowOffset = CGSizeMake(-6, 0);
tip.shadowRadius = 2;
return tip;
}
- (void)setProgress:(CGFloat)progress{
sign = (progress >= _progress)? 1 : -1;
[self animateProgressTo:@(progress)];
}
-(void)animateProgressTo:(NSNumber *) newValueNumber{
float newValue = newValueNumber.floatValue;
_progress = (_progress + (sign * 0.1) > 1)? 1 : _progress + (sign * 0.1);
if ((_progress > newValue && sign == 1) || (_progress < newValue && sign == -1)) {
_progress = newValue;
}
maskLayer.strokeEnd = _progress;
tipView.transform = CATransform3DMakeRotation(-(1 - _progress + 0.002) * M_PI*2, 0, 0, 1); //the 0.002 closes a small gap between the tip and the annulus strokeEnd
int i = (int)(_progress*(slices - 1));
tipView.fillColor = ((UIColor *)colors[i]).CGColor;
if (sign == 1) {
if (_progress < newValue) {
[self performSelector:@selector(animateProgressTo:) withObject:@(newValue) afterDelay:0.05];
}
}else{
if (_progress > newValue) {
[self performSelector:@selector(animateProgressTo:) withObject:@(newValue) afterDelay:0.05];
}
}
NSLog(@"%f",_progress);
}
- (CAShapeLayer *)createAnnulusMask {
maskLayer = [CAShapeLayer layer];
maskLayer.frame = self.bounds;
segmentAngle = 2*M_PI/(slices);
startAngle = M_PI_2;
CGFloat endAngle = startAngle + 2*M_PI;
maskLayer.path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds)) radius:circleRadius - self.ringThickness startAngle:startAngle endAngle:endAngle clockwise:YES].CGPath;
maskLayer.fillColor = [UIColor clearColor].CGColor;
maskLayer.strokeColor = [UIColor blackColor].CGColor;
maskLayer.lineWidth = self.ringThickness * 2;
maskLayer.strokeEnd = self.progress;
return maskLayer;
}
-(void)drawRect:(CGRect)rect{
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetAllowsAntialiasing(ctx, NO);
CGPoint center = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
for(int i=0;i<slices;i++){
CGContextSaveGState(ctx);
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:center];
[path addArcWithCenter:center radius:circleRadius startAngle:startAngle endAngle:startAngle+segmentAngle clockwise:YES];
[path addClip];
[colors[i] setFill];
[path fill];
CGContextRestoreGState(ctx);
startAngle += segmentAngle;
}
}