<Error>：CGContextSetFillColorWithColor：无效上下文 0x0

Question

我是 objective-c 的新手，现在我遇到了一个我不知道如何解决的问题。我已阅读此主题 CGContextSetFillColorWithColor: invalid context 0x0 但没有找到答案。

问题是我遇到了 2 个这样的错误：

CGContextSetFillColorWithColor: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

这是我的代码：

#import "PushButtonView.h"
#import <QuartzCore/QuartzCore.h>

@implementation PushButtonView

@synthesize isAddButton;
@synthesize fillColor;

-(id)initWithCoder:(NSCoder *)aDecoder{
    self = [super initWithCoder:(NSCoder *)aDecoder];
    if (!self) {
    return nil;
}
[self inspectableDefaults];
return self;
}

-(void)inspectableDefaults{
    self.isAddButton = YES;
    self.fillColor = [UIColor colorWithRed:0.95 green:0.6 blue:0.5 alpha:1];    
    [self.fillColor setFill];
}

- (void)drawRect:(CGRect)rect {
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextClearRect(context, rect);
    if (self.isAddButton) {
        self.fillColor = [UIColor colorWithRed:0.3 green:0.85 blue:0.91 alpha:1];
    } else
    self.fillColor = [UIColor colorWithRed:0.95 green:0.6 blue:0.5 alpha:1];
    [self.fillColor setFill];
    CGContextFillEllipseInRect(context, rect);

//Line characteristics
    CGContextSetRGBStrokeColor(context, 1, 1, 1, 1);
    CGContextSetLineWidth(context, 4);

// Horizontal line
    CGPoint bezierStart = {self.bounds.origin.x + (self.bounds.size.width)/5, self.bounds.size.height/2};
    CGPoint bezierEnd = {self.bounds.size.width - (self.bounds.size.width)/5, self.bounds.size.height/2};
    CGContextBeginPath(context);
    CGContextMoveToPoint(context, bezierStart.x, bezierStart.y);
    CGContextAddLineToPoint(context, bezierEnd.x, bezierEnd.y);
    CGContextStrokePath(context);

 // Vertical line
    if (self.isAddButton) {                    
        CGPoint bezier2Start = {self.bounds.size.width/2, self.bounds.size.width - (self.bounds.size.height)/5};
        CGPoint bezier2End = {self.bounds.size.width/2, (self.bounds.origin.y + self.bounds.size.height/5)};
        CGContextBeginPath(context);
        CGContextMoveToPoint(context, bezier2Start.x, bezier2Start.y);
        CGContextAddLineToPoint(context, bezier2End.x, bezier2End.y);
        CGContextStrokePath(context);
    }

   [self.fillColor setFill];
 }
 @end

Answer 1

在您的 inspectableDefaults 方法中，您不应调用 [self.fillColor setFill]。 setFill 方法为当前图形上下文设置填充颜色，由于您没有任何上下文，所以会出现此错误。只需删除这一行就可以了。

<Error>：CGContextSetFillColorWithColor：无效上下文 0x0

<Error>: CGContextSetFillColorWithColor: invalid context 0x0

core-graphics

objective-c

ios