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【ObjC】图像压缩

作者:宝清 / 发布于2014/11/17/ 351


	- (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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