Objective c CGContextSaveGState:无效的上下文0x0错误

我正在尝试在我的应用程序中播放Youtube上的视频 代码：

但它显示了一些错误，如：

CGContextSaveGState: invalid context 0x0 error.
CGContextSetBlendMode: invalid context 0x0.
 CGContextSetAlpha: invalid context 0x0
CGContextScaleCTM: invalid context 0x0.
 CGContextClipToRect: invalid context 0x0.
CGContextDrawTiledImage: invalid context 0x0.
CGContextRestoreGState: invalid context 0x0
 CGContextGetCTM: invalid context 0x0.
 CGContextClipToRect: invalid context 0x0.
 CGContextDrawTiledImage: invalid context 0x0.
 CGContextRestoreGState: invalid context 0x0.
CGContextGetCTM: invalid context 0x0.

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为什么videoView=nil；在self上添加videoView后？remove videoView=nil，您的问题将得到解决。我删除了videoView nil，但它仍然会给出相同类型的错误

CGContextSaveGState: invalid context 0x0 error.
CGContextSetBlendMode: invalid context 0x0.
 CGContextSetAlpha: invalid context 0x0
CGContextScaleCTM: invalid context 0x0.
 CGContextClipToRect: invalid context 0x0.
CGContextDrawTiledImage: invalid context 0x0.
CGContextRestoreGState: invalid context 0x0
 CGContextGetCTM: invalid context 0x0.
 CGContextClipToRect: invalid context 0x0.
 CGContextDrawTiledImage: invalid context 0x0.
 CGContextRestoreGState: invalid context 0x0.
CGContextGetCTM: invalid context 0x0.