iOS對圖像進行壓縮代碼

dw2d 9年前發布 | 838 次閱讀 Objective-C IOS 

- (UIImage)scaleFromImage:(UIImage)image scaledToSize:(CGSize)newSize
{
 CGSize imageSize = image.size;
 CGFloat width = imageSize.width;
 CGFloat height = imageSize.height;


if (width <= newSize.width && height <= newSize.height){
  return image;
 }


if (width == 0 || height == 0){
  return image;
 }


CGFloat widthFactor = newSize.width / width;
 CGFloat heightFactor = newSize.height / height;
 CGFloat scaleFactor = (widthFactor<heightFactor?widthFactor:heightFactor);


CGFloat scaledWidth = width  scaleFactor;
 CGFloat scaledHeight = height  scaleFactor;
 CGSize targetSize = CGSizeMake(scaledWidth,scaledHeight);



UIGraphicsBeginImageContext(targetSize);
[image drawInRect:CGRectMake(0,0,scaledWidth,scaledHeight)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;



}
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