2
我'做一個應用程序是這樣的：你加載一個照片，你把圖像了它，像氣球等。合併兩個UIImage的是旋轉和縮放
當我嘗試合併的這一個只有調整大小的圖像才能正常工作。就像它應該是10px一樣，但沒問題。
當你旋轉圖像[UIImageView]時，它出現了問題，它顯得大得多，它的圖像，我嘗試分配的東西，什麼都沒有。我離開代碼。我希望有人能幫忙。
注：圖像大小其內部的UIImageView，然後由主圖像的比例乘以它
- (UIImage *)mergeImage:(UIImageView *)mainImage withImageView:(UIImageView *)imageView {
UIImage *temp = imageView.image;
UIImage *tempMain = mainImage.image;
CGFloat mainScale = [self imageViewScaleFactor:mainImage];
CGFloat tempScale = 1/mainScale;
NSLog(@"%f", tempScale);
//Rotate UIIMAGE
UIGraphicsBeginImageContext(temp.size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGAffineTransform transform = CGAffineTransformIdentity;
transform = CGAffineTransformTranslate(transform, temp.size.width/2, temp.size.height/2);
CGFloat angle = atan2(imageView.transform.b, imageView.transform.a);
transform = CGAffineTransformRotate(transform, angle);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
CGContextConcatCTM(ctx, transform);
// Draw the image into the context
CGContextDrawImage(ctx, CGRectMake(-temp.size.width/2, -temp.size.height/2, temp.size.width, temp.size.height), temp.CGImage);
// Get an image from the context
temp = [UIImage imageWithCGImage: CGBitmapContextCreateImage(ctx)];
NSLog(@"%f %f %f", mainScale, mainImage.frame.size.width, mainImage.frame.size.height);
UIGraphicsBeginImageContextWithOptions(tempMain.size, NO, 1.0f);
//Get imageView size & position
NSLog(@"%f %f %f %f", imageView.frame.origin.x, imageView.frame.origin.y, imageView.frame.size.width, imageView.frame.size.height);
CGFloat offsetX = 0;
CGFloat offsetY = -44;
if (tempMain.size.height > tempMain.size.width) {
offsetX = ((tempMain.size.width * mainScale) - 320)/2;
}else{
offsetY = ((tempMain.size.height * mainScale) - 416)/2;
offsetY -= 44;
}
CGFloat imageViewX = (imageView.frame.origin.x + offsetX) * tempScale;
CGFloat imageViewY = (imageView.frame.origin.y + offsetY) * tempScale;
CGFloat imageViewW = imageView.frame.size.width * tempScale;
CGFloat imageViewH = imageView.frame.size.height * tempScale;
CGRect tempRect = CGRectMake(imageViewX, imageViewY, imageViewW, imageViewH);
[tempMain drawAtPoint:CGPointZero];
[temp drawInRect:tempRect];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
感謝