先上问题：出现以下日志：
Oct 9 11:34:38 Trip[5861] <Error>: CGContextDrawImage: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Oct 9 11:34:38 Trip[5861] <Error>: CGBitmapContextCreateImage: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
解决办法：是加载uiimageView的图片url不正确导致无法正常显示出来，url改为正确的即可。
先上问题：出现以下日志： Oct 9 11:34:38 Trip[5861]
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本文标题：<Error>: CGContextDrawImag
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