缩放图片限制横宽区域内

/* * 缩放图片限制横宽区域内 */- (UIImage*)scaleWithSize:(CGSize)size {    CGFloat imageWidth = self.size.width;    CGFloat imageHeight = self.size.height;     CGFloat wScale = imageWidth / size.width;    CGFloat hScale = imageHeight / size.height;    NSLog(@"ws = %f, hs = %f", wScale, hScale);         CGSize newSize = self.size;    BOOL needRedraw;    if (wScale > hScale && wScale > 1) {        newSize.width = size.width;        newSize.height = imageHeight / wScale;        needRedraw = YES;    }    else if (hScale > wScale && hScale > 1) {        newSize.width = imageWidth / hScale;        newSize.height = size.height;        needRedraw = YES;    }         NSLog(@"w = %f, h = %f", newSize.width, newSize.height);         if (needRedraw) {        UIGraphicsBeginImageContext(newSize);        [self drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];        self = UIGraphicsGetImageFromCurrentImageContext();        UIGraphicsEndImageContext();    }     return self;}