Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
541 views
in Technique[技术] by (71.8m points)

objective c - CGContext invalid context 0x0

: 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.

and similar errors repeated with:

  • CGContextSaveGState
  • CGContextSetFlatness
  • CGContextAddPath
  • CGContextDrawPath
  • CGContextRestoreGState
  • CGContextSaveGState
  • CGContextSetFlatness
  • CGContextAddPath
  • CGContextDrawPath
  • CGContextRestoreGState
  • CGContextSetFillColorWithColor
  • CGContextSetStrokeColorWithColor
  • CGContextSetFillColorWithColor
  • CGContextSetStrokeColorWithColor
  • CGContextGetBlendMode
  • CGContextSetBlendMode
  • and more...

In my App, I do not use any CGContext stuff. I just have a UITextView, UIButton and UILabel. Not much codes added yet. Just set the content of UITextView by:

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

How to resolve the error ?

I'm using Xcode 5.0 (build 5A1413), iOS 7 Simulator (64-bit Retina 4"), Mac OS X 10.8.5

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Try this: In xcode add symbolic breakpoint to CGPostError. (Add symbolic breakpoint, and to Symbol field type CGPostError)

When error happen, debugger will stop code executions and you can check stack of methods calls and check parameters.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...