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

在我的情况下，我有这个警告时，创建一个可靠的图像与caps insets。问题是我没有在“未封顶”区域留下至少1个像素。

    UIImage *image = [UIImage imageNamed:@"name"];
    UIEdgeInsets edgeInsets = UIEdgeInsetsMake(20, 10, 20, 10);  //Problem here if the width is 20 or the height is 40
    image = [image resizableImageWithCapInsets:edgeInsets];

2015-03-09 15:28:40

直接回答: 这个问题是因为你已经使用了核心图形元素，如CGContext等，而不是- (void)drawRect:(CGRect)rect这个方法。

现在请将代码移到该方法。它将停止给你警告/错误。

2015-05-14 06:49:28

就像其他人在这里评论的一样，当我做以下任何一件事时，我得到了这个警告:

在空白文本框中:双击，触摸并按住，长时间单点。

这似乎只影响iOS 7.0.3

我发现了一个工作周围，警告不会被触发，如果你的纸板不是NULL。

所以我在textFieldDidBeginEditing中做了以下事情:

- (void)textFieldDidBeginEditing:(UITextField *)textField {

    UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
    if (pasteboard.string.length == 0) {

        pasteboard.string = @" ";

    }
}

我在iphone 4s、5和5s的iOS 7.0.3模拟器中测试了这一点，不再收到警告。我也在iphone 6和6 plus上的iOS 8模拟器中测试了这一点，但我不相信iOS 8会受到影响。

在发现这个工作之前，我经历了两天的挫折，所以我真的希望我的回答能帮助那些有同样问题的人。

2015-08-31 03:00:33

如果在使用UIBezierPath并为描边或填充设置颜色时发生错误，请将设置的颜色代码放在drawRect函数中而不是其他地方。

2016-07-04 03:42:18

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

无效上下文0x0在iOS 7.0和系统降级

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