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

我有这个问题与一个简单的UITextField(键盘不显示和许多不同的无效上下文错误消息在控制台)。我只是通过查找SO上的另一个问题找到了一个解决方案:无法找到CFBundle CertUIFramework.axbundle的可执行文件

只做:

点击iOS模拟器>重置内容和设置…然后再跑。

问题不应该再存在了

2014-01-08 16:03:45

其他回答

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

其他人会要求你在访问核心图形上下文的地方发布代码，但我怀疑这是问题所在。这些无效的上下文0x0错误消息很常见，很容易在iOS 7中重现。事实上，我可以使用零代码的故事板重现错误。我在IB中拖动UITextField到画布上，运行应用程序，双击文本字段内。

在许多情况下，我很难认真对待无效上下文0x0错误消息。我不知道您的情况是否值得更大的关注(我同意Rob Napier的观点，这是值得研究的，特别是如果您显式地使用图形上下文)。

在我自己的项目中，我希望有一天这些错误会神奇地消失(但这一天并没有伴随着7.0.3)。

更新:在安装Xcode 5.1并瞄准iOS 7.1后，我再也不能通过双击空文本字段来重现错误。

2013-10-25 21:26:16

这有点俗气，但对我很管用。

我在UITableViewCell的init中设置了UIImageView，给它一个大小和约束。

然后在我的视图控制器的cellForRowAtIndexPath中我这样做:

let img = PFImageView(frame: CGRect(x: 0, y: 0, width: 50, height: 50))
img.setImage(withFile: nil, defaultText: message.senderUsername)
cell.profileImageView?.image = img.image

这避免了错误，在函数下面，我为UIImageView设置了实际图像。上面的代码是一个很好的默认值

2018-09-05 15:17:33

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

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

无效上下文0x0在iOS 7.0和系统降级

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