IOS图片压缩上传服务器终极解决方案

来源：互联网发布：好玩的贴吧有哪些知乎编辑：程序博客网时间：2024/05/02 02:47

我最终才去的方案如下：

/** *  压缩图片到指定大小并且返回图片数据 * *  @param maxFileSize 指定大小 * *  @return 图片数据 */- (NSData *)compressionImageToDataWithMaxFileSize:(NSInteger)maxFileSize;- (NSData *)compressionImageToDataTargetWH:(CGFloat)targetWH maxFileSize:(NSInteger)maxFileSize;

先调整分辨率，分辨率可以自己设定一个值，大于的就缩小到这分辨率，小余的就保持原本分辨率。然后在判断图片数据大小，传入范围maxSize = 100 ，大于的再压缩，小的就保持原样

- (NSData *)compressionImageToDataTargetWH:(CGFloat)targetWH maxFileSize:(NSInteger)maxFileSize{    if (targetWH <= 0) {        targetWH = 1024;    }        //缩    CGSize newSize = CGSizeMake(self.size.width, self.size.height);    CGFloat tempHeight = newSize.height / targetWH;    CGFloat tempWidth = newSize.width / targetWH;    if (tempWidth > 1.0 && tempWidth > tempHeight) {        newSize = CGSizeMake(self.size.width / tempWidth, self.size.height / tempWidth);    }    else if (tempHeight > 1.0 && tempWidth < tempHeight){        newSize = CGSizeMake(self.size.width / tempHeight, self.size.height / tempHeight);    }    UIGraphicsBeginImageContext(newSize);    [self drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();        //压    CGFloat compression = 0.9f;    CGFloat maxCompression = 0.1f;    NSData *imageData = UIImageJPEGRepresentation(newImage, compression);    while (imageData.length / 1000 > maxFileSize && compression > maxCompression) {        compression -= 0.1;        imageData = UIImageJPEGRepresentation(newImage, compression);    }        return imageData;}

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