objective-c - CGContext 无效上下文 0x0

Question

: 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.

和重复的类似错误:

• CGContextSaveGState
• CGContextSetFlatness
• CGContextAddPath
• CGContextDrawPath
• CGContextRestoreGState
• CGContextSaveGState
• CGContextSetFlatness
• CGContextAddPath
• CGContextDrawPath
• CGContextRestoreGState
• CGContextSetFillColorWithColor
• CGContextSetStrokeColorWithColor
• CGContextSetFillColorWithColor
• CGContextSetStrokeColorWithColor
• CGContextGetBlendMode
• CGContextSetBlendMode
• 还有更多...

在我的应用程序中，我不使用任何 CGContext 东西。我只有一个 UITextView、UIButton 和 UILabel。还没有添加太多代码。只需通过以下方式设置 UITextView 的内容:

[self.text_view setText:@"123"];

如何解决错误？

我正在使用 Xcode 5.0(内部版本 5A1413)、iOS 7 模拟器(64 位 Retina 4")、Mac OS X 10.8.5

Answer 1

试试这个:在 xcode 中将符号断点添加到 CGPostError。 (添加符号断点，并在 Symbol 字段类型 CGPostError 中)

当错误发生时，调试器将停止代码执行，您可以检查方法调用堆栈并检查参数。