SDWebImage 不能加载网络图片。

发现出这个问题

<Error>: CGBitmapContextCreate: unsupported parameter combination: set CGBITMAP_CONTEXT_LOG_ERRORS environmental variable to see the details
<Error>: CGContextDrawImage: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
<Error>: CGBitmapContextCreateImage: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.

解决:

add this in SDWebImageDecoder.m file:

    if (!context) {
        if (unsupportedColorSpace){
            CGColorSpaceRelease(colorspaceRef);
        }
        return image;
    }
after this call:

CGContextRef context = CGBitmapContextCreate(NULL, width,
                                                 height,
                                                 CGImageGetBitsPerComponent(imageRef),
                                                 0,
                                                 colorspaceRef,
                                                 kCGBitmapByteOrderDefault | kCGImageAlphaPremultipliedFirst);