ios – 如何调整UIImage的大小,同时保持其纵横比

概述我想调整UIImage的大小,同时保持其纵横比.我已经写了下面的代码,但是没有按预期的方式工作. 码 -(UIImage * ) scaleImage: (UIImage * ) image toSize: (CGSize) targetSize { CGFloat scaleFactor = 1.0; if (image.size.width > targetSize.widt 我想调整UIImage的大小,同时保持其纵横比.我已经写了下面的代码,但是没有按预期的方式工作.

码

-(UIImage * ) scaleImage: (UIImage * ) image toSize: (CGSize) targetSize {    CGfloat scaleFactor = 1.0;    if (image.size.wIDth > targetSize.wIDth || image.size.height > targetSize.height)        if (!((scaleFactor = (targetSize.wIDth / image.size.wIDth)) > (targetSize.height / image.size.height))) //scale to fit wIDth,or            scaleFactor = targetSize.height / image.size.height; // scale to fit heigth.    UIGraphicsBeginImageContext(targetSize);    CGRect rect = CGRectMake((targetSize.wIDth - image.size.wIDth * scaleFactor) / 2,(targetSize.height - image.size.height * scaleFactor) / 2,image.size.wIDth * scaleFactor,image.size.height * scaleFactor);    [image drawInRect: rect];    UIImage * scaledImage = UIGraphicsGetimageFromCurrentimageContext();    UIGraphicsEndImageContext();    return scaledImage;}

这里究竟是错的？

解决方法 我在几个项目中使用类似的东西：

- (UIImage*) scaleImage:(UIImage*)image toSize:(CGSize)newSize {    CGSize scaledSize = newSize;    float scaleFactor = 1.0;    if( image.size.wIDth > image.size.height ) {        scaleFactor = image.size.wIDth / image.size.height;        scaledSize.wIDth = newSize.wIDth;        scaledSize.height = newSize.height / scaleFactor;    }    else {        scaleFactor = image.size.height / image.size.wIDth;        scaledSize.height = newSize.height;        scaledSize.wIDth = newSize.wIDth / scaleFactor;    }    UIGraphicsBeginImageContextWithOptions( scaledSize,NO,0.0 );    CGRect scaledImageRect = CGRectMake( 0.0,0.0,scaledSize.wIDth,scaledSize.height );    [image drawInRect:scaledImageRect];    UIImage* scaledImage = UIGraphicsGetimageFromCurrentimageContext();    UIGraphicsEndImageContext();        return scaledImage;}

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