iOS对图像进行压缩代码
- 作者: 霜霜洗逼用霸王
- 来源: 51数据库
- 2022-08-17
- (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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