在发送到服务器之前用UIImageJPEGRepresentation压缩图像

Question

我试图在使用UIImageJPEGRepresentation上传到服务器之前压缩图像。

到目前为止，我已经将图像更改为PNG，并将质量更改为0.01f。我试过几种不同的写法。

在发送到服务器之前这是最优的吗?我应该改变什么来优化?

 - (void)uploadPhoto {
    WUTModelImageUploadReq *imageUploadReq = [[WUTModelImageUploadReq alloc]init];
    imageUploadReq.photo = [self encodeToBase64String:[UIImage imageWithData:UIImageJPEGRepresentation(self.viewControllerPost.imageForPost, 0.01f)]];
    imageUploadReq.extension = @"png";
    void (^wsSuccessHandler)(AFHTTPRequestOperation *operation, NSDictionary* responseObject) = ^(AFHTTPRequestOperation *operation, id responseObject){
    NSLog(@"Pull Feed responseObject %@",responseObject);
    NSError *error;
    WUTModelPostImageResponse *wsResponse = [[WUTModelPostImageResponse alloc]initWithDictionary:(NSDictionary *)responseObject error:&error];
    if (error) {
        errorMessage = @"Failure to upload image.";
        [self postExecuteFail];
    }
    else{
        if (wsResponse.success) {
            WUTModelImage *imageTemp = [wsResponse.data firstObject];
            [postItem setObject:imageTemp.photo forKey:@"photo"];
            [self uploadPostFeed];
        }else{
            errorMessage = @"Failure to upload image.";
            [self postExecuteFail];
        }
      }
   };

Answer 1

建议:

1. 使用扩展名"jpg"，而不是"png"。
2. 使用0.0的compressionQuality来最大化压缩。
3. 考虑调整图像的大小，如果你的情况允许。