iOS : CGContextDrawImage: invalid context 0x0.

: CGContextDrawImage: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.

: CGBitmapContextCreateImage: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.

网上查了很多,说是iOS6的bug,不影响程序的运行上线,可是出现这个bug很难受啊

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