iOS UIImage 压缩到100K 以内上传

// ------ 图片压缩至100K以内上传

-(NSData *)imageData:(UIImage *)myimage
{
    NSData *data=UIImageJPEGRepresentation(myimage, 1.0);
    if (data.length>100*1024) {
        if (data.length>2*1024*1024) {//2M以及以上
            data=UIImageJPEGRepresentation(myimage, 0.05);
        }else if (data.length>1024*1024) {//1M-2M
            data=UIImageJPEGRepresentation(myimage, 0.1);
        }else if (data.length>512*1024) {//0.5M-1M
            data=UIImageJPEGRepresentation(myimage, 0.2);
        }else if (data.length>200*1024) {//0.25M-0.5M
            data=UIImageJPEGRepresentation(myimage, 0.4);
        }
    }
    return data;
}