ios CGContextSetFillColorWithColor: 无效的上下文 0x0
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CGContextSetFillColorWithColor: invalid context 0x0
提问by E-Madd
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.
CGContextSetFillColorWithColor: 无效的上下文 0x0。这是一个严重的错误。此应用程序或其使用的库正在使用无效的上下文，从而导致系统稳定性和可靠性的整体下降。此通知是一种礼貌：请解决此问题。在即将到来的更新中，这将成为致命错误。
I'm getting the error from the [color setFill] line of this method. Any ideas on how I can resolve it?
我从该方法的 [color setFill] 行收到错误消息。关于如何解决它的任何想法？
+ (UIImage *)fillImage:(UIImage*)image withColor:(UIColor *)color
{
// begin a new image context, to draw our colored image onto
UIGraphicsBeginImageContextWithOptions(image.size, NO, [[UIScreen mainScreen] scale]);
// get a reference to that context we created
CGContextRef context = UIGraphicsGetCurrentContext();
// set the fill color
[color setFill];
// translate/flip the graphics context (for transforming from CG* coords to UI* coords
CGContextTranslateCTM(context, 0, image.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
// set the blend mode to overlay, and the original image
CGContextSetBlendMode(context, kCGBlendModeOverlay);
CGRect rect = CGRectMake(0, 0, image.size.width, image.size.height);
//if(overlay) CGContextDrawImage(context, rect, img.CGImage);
// set a mask that matches the shape of the image, then draw (overlay) a colored rectangle
CGContextClipToMask(context, rect, image.CGImage);
CGContextAddRect(context, rect);
CGContextDrawPath(context,kCGPathFill);
// generate a new UIImage from the graphics context we drew onto
UIImage *coloredImg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//return the color-burned image
return coloredImg;
}
回答by rob mayoff
Your image.sizeisn't valid, so UIGraphicsBeginImageContextWithOptionsisn't creating a graphics context. Both image.size.widthand image.size.heightmust be positive, finite numbers.
您image.size的无效，因此UIGraphicsBeginImageContextWithOptions未创建图形上下文。双方image.size.width并image.size.height必须是积极的，有限的数字。
Possibly imageitself is nil. When you send the sizemessage to nil, you get back CGSizeZero.
可能image本身就是nil。当您向 发送size消息时nil，您会收到回复CGSizeZero。
