无效上下文0x0在iOS 7.0和系统降级

关于这个可怕的问题，我已经阅读了尽可能多的搜索结果，不幸的是，每个搜索结果似乎都集中在一个特定的函数调用上。

我的问题是，我从多个函数得到相同的错误，我猜是从我使用的函数回调的。

更糟糕的是，实际的代码是在另一个项目中导入的自定义私有框架中，因此，调试不是那么简单吗?

有人能告诉我正确的方向吗?我有一种感觉，我正在错误地调用某些方法或与坏的上下文，但xcode的输出在这一点上不是很有帮助。

: 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. : CGContextSetStrokeColorWithColor: 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. CGContextSaveGState: 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. : CGContextSetFlatness: 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. : CGContextAddPath: 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. : CGContextDrawPath: 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. : CGContextRestoreGState: 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. : CGContextGetBlendMode: 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.

当呈现自定义视图或其继承的类之一时，可能会发生这些错误。这时它们会生成多次，直到键盘不再提供任何输入。触摸事件仍然被注册，但是系统变慢，最终可能导致未分配对象错误。

编辑#1:我确实可以访问正在导入的框架，但我没有看到导致问题的类中有任何奇怪的东西。

编辑#2:我刚刚收到一封电子邮件，iOS 7.1已经发布给开发者了。我很好奇这种情况是否会消失，或者变得更糟，或者是否能得到解决。

当前回答

在某些情况下，你可能需要包含一行#import <QuartzCore/QuartzCore.h>。

2014-07-17 06:46:26

其他回答

在某些情况下，当您在视图中放置和移动UI元素(特别是以编程方式绘制的自定义元素)时，关闭受影响视图中的自动布局会导致此错误消失。当我发现这个症状时，我正在使用JVFloatLabeledTextField。

2014-02-23 02:01:09

在某些情况下，你可能需要包含一行#import <QuartzCore/QuartzCore.h>。

2014-07-17 06:46:26

这些类型的错误是历史上调用核心图形函数的结果，而不是在一个上下文中建立的drawRect或调用之间，如UIGraphicsBeginImageContext和UIGraphicsEndImageContext(或其他UIKit函数，如开始和结束一个上下文)。

话虽如此，但bilobatum说的没错，这一系列错误可能是他在回答中提到的iOS 7漏洞造成的。如果在你的iOS6目标中没有看到这些错误，或者在快速扫描这个私有框架后，你没有发现任何可疑的核心图形调用，这可能只是iOS 7的错误。接得好，双叶巴坦!

2013-10-25 21:26:38

对我来说，答案是我不必要地释放了drawRect:中的图形上下文。在CGPostError上抛出一个符号断点使我找到了罪魁祸首。

2014-04-03 22:10:10

我得到了代码错误

UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:pointA];
[path addLineToPoint:pointB];
[path addLineToPoint:pointC];
[[UIColor colorWithHexString:@"EFEFEF"] set];
[path fill];
[path closePath];

CAShapeLayer *triangle = [CAShapeLayer layer];
triangle.fillColor = [UIColor colorWithHexString:@"EFEFEF"].CGColor;
triangle.path = path.CGPath;

return triangle;

并在删除代码后

[[UIColor colorWithHexString:@"EFEFEF"] set];
[path fill];

世界变得寂静

2016-03-23 08:27:13

无效上下文0x0在iOS 7.0和系统降级

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