cornerRadius 导致加载时间过长 iOS 10

Question

我的应用程序有问题。我有一个带有 25 个按钮的 View，并且 cornerRadius 发生了变化。由于 iOS 10 加载此视图大约需要 5-6 秒。这是相关代码：

- (void)setupTiles {
 for (TileButton *btn in tiles_btn) {
  btn.alpha = 0.0;
  btn.layer.borderColor = [UIColor blackColor].CGColor;
  btn.layer.borderWidth = 1.0f;
  [btn layoutIfNeeded];
  bin.layer.cornerRadius = btn.frame.size.width*0.3;
 }
 [self colorTilesWithArray:currentTileColors];
}

当我删除以下行时，会立即加载视图：

[btn layoutIfNeeded];
bin.layer.cornerRadius = btn.frame.size.width*0.3;

Buttons 分组在一个 outlet 集合中，以备不时之需。

有人有解决办法吗？提前致谢！

妮可

Image 1: This takes about 5-6 seconds

Image 2: This is the View that will be loaded

TileButton.h-文件:

@interface TileButton : UIButton

@property (nonatomic) int colorMode;

+ (UIColor *)blue;
+ (UIColor *)red;
+ (UIColor *)green;
+ (UIColor *)yellow;
+(UIColor *)colorForColorCode:(int)colorCode;
-(int)colorMode;

@end

TileButton.m-文件:

@implementation TileButton
- (instancetype)init {
self = [super init];
if (self) {
    self.layer.cornerRadius = self.frame.size.width*0.3;
}
return self;
}

+(UIColor *)blue {
return [UIColor colorWithRed:41.0/255.0 green:161.0/255.0 blue:255.0/255.0 alpha:1];
}

+(UIColor *)red {
return [UIColor colorWithRed:255.0/255.0 green:71.0/255.0 blue:109.0/255.0 alpha:1];
}

+(UIColor *)green {
return [UIColor colorWithRed:0.0/255.0 green:185.0/255.0 blue:30.0/255.0 alpha:1];
} 

+(UIColor *)yellow {
return [UIColor colorWithRed:255.0/255.0 green:198.0/255.0 blue:26.0/255.0 alpha:1];
} 

+(UIColor *)colorForColorCode:(int)colorCode {
switch (colorCode) {
    case 1:
        return [TileButton blue];
        break;
    case 2:
        return [TileButton red];
        break;
    case 3:
        return [TileButton green];
        break;
    case 4:
        return [TileButton yellow];
        break;
    default:
        return [UIColor blackColor];
        break;
}
}

-(int)colorMode {
if (CGColorEqualToColor(self.backgroundColor.CGColor, [TileButton blue].CGColor))
    return 1;
else if (CGColorEqualToColor(self.backgroundColor.CGColor, [TileButton red].CGColor))
    return 2;
else if (CGColorEqualToColor(self.backgroundColor.CGColor, [TileButton green].CGColor))
    return 3;
else if (CGColorEqualToColor(self.backgroundColor.CGColor, [TileButton yellow].CGColor))
    return 4;
else
    return -1;
}

@end

Answer 1

为什么不能在for循环外设置圆角半径？

UIButton *btn = [UIButton alloc] initWithFrame:CGRectMake(0, 0, 0, 0)]; // set your frame here
bin.layer.cornerRadius = btn.frame.size.width*0.3; // width stays the same, set it here
for (TileButton *btn in tiles_btn) {
    btn.alpha = 0.0;
    btn.layer.borderColor = [UIColor blackColor].CGColor;
    btn.layer.borderWidth = 1.0f;
    // you need to set the button frame here
    btn.frame = CGRectMake(0,0,0,0);
    [btn layoutIfNeeded];
}
[self colorTilesWithArray:currentTileColors];

Answer 2

假设 TileButton 是 UIButton 的子类，在初始化时，您可以将 TileButton 设置为具有自定义颜色、宽度和圆角半径。这样一来，您的所有按钮在创建按钮时都已经具有指定的自定义设置。

Answer 3

由于您是在 Interface Builder 中创建按钮，因此您需要在 awakeFromNib 方法中设置 cornerRadius。它应该看起来像这样：

@implementation TileButton
-(void) awakeFromNib {
     [super awakeFromNib];
     self.layer.cornerRadius = self.frame.size.width*0.3;
}

https://developer.apple.com/reference/objectivec/nsobject/1402907-awakefromnib

cornerRadius 导致加载时间过长 iOS 10

cornerRadius causes long load time in iOS 10

ios

calayer

xcode8

ios10

cornerradius