我在 drawInRect 中捏合、平移或旋转 UIImageview
时遇到问题,转换没有被保留。
如何在 drawInRect 中保留变换?
我试过了但是不行:(
- (UIImage*) combineImage:(UIImageView *)selectedImage withOverlay:(UIImageView *)overlayImage
{
/* Identify the region that needs to be cropped */
CGRect viewForImgFrame = self.viewForImg.frame;
NSLog(@"view %@", NSStringFromCGRect(viewForImgFrame));
NSLog(@"selectedImage Img value %@",selectedImage);
NSLog(@"overlayImage Img value %@",overlayImage);
CGSize newImageSize =self.viewForImg.frame.size;
NSLog(@"CGSize %@",NSStringFromCGSize(newImageSize));
UIGraphicsBeginImageContextWithOptions(newImageSize, NO, 0.0); //retina res
//[self.viewForImg.layer renderInContext:UIGraphicsGetCurrentContext()];
[selectedImage.image drawInRect:CGRectMake(0, 0, selectedImage.frame.size.width, selectedImage.frame.size.height)];
CGContextConcatCTM(UIGraphicsGetCurrentContext(), overlayImage.transform);
[overlayImage.image drawInRect:CGRectMake(overlayImage.frame.origin.x, overlayImage.frame.origin.y, overlayImage.frame.size.width, overlayImage.frame.size.height)];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
NSData *imgData = UIImageJPEGRepresentation(image, 0.9); //UIImagePNGRepresentation ( image ); // get JPEG representation
UIImage * imagePNG = [UIImage imageWithData:imgData]; // wrap UIImage around PNG representation
UIGraphicsEndImageContext();
return imagePNG;
}
非常感谢任何评论。
最佳答案
你需要尝试
CGRectApplyAffineTransform(<#CGRect rect#>, <#CGAffineTransform t#>)
你的代码应该是这样的
CGContextConcatCTM(UIGraphicsGetCurrentContext(), overlayImage.transform);
CGRect rect = CGRectMake(overlayImage.frame.origin.x, overlayImage.frame.origin.y, overlayImage.frame.size.width, overlayImage.frame.size.height);
CGRect transformedRect = CGRectApplyAffineTransform(rect, overlayImage.transform);
[overlayImage.image drawInRect:transformedRect];
关于ios - drawInRect 不读取/保留 UIImageView 转换,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19706419/