图片不失真压缩

不失真压缩"/>

图片不失真压缩

//对图片尺寸进行压缩

-(UIImage *)compressOriginalImage:(UIImage *)image toSize:(CGSize)size{

    UIGraphicsBeginImageContext(size);

    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];

    UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return scaledImage;

}

//对图片质量进行压缩 

- (NSData *)imageData:(UIImage *)myimage

{

    NSData *data=UIImageJPEGRepresentation(myimage, 1.0);

    if (data.length>100*1024) {

        if (data.length>1024*1024) {//1M以及以上

            data=UIImageJPEGRepresentation(myimage, 0.1);

        }else if (data.length>512*1024) {//0.5M-1M

            data=UIImageJPEGRepresentation(myimage, 0.5);

        }else if (data.length>200*1024) {//0.25M-0.5M

            data=UIImageJPEGRepresentation(myimage, 0.9);

        }

    }

    return data;

}

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