调用系统文件夹上传文件

调用系统文件夹主要用到了UIDocumentPicker，上传文件使用AFNetWorking

1.首先接受<UIDocumentPickerDelegate>

2.在点击事件中加入

//文件类型      
 NSArray *documentTypes = @[@"public.content", @"public.text", @"public.source-code ", @"public.image", @"public.audiovisual-content", @"com.adobe.pdf", @"com.apple.keynote.key", @"com.microsoft.word.doc", @"com.microsoft.excel.xls", @"com.microsoft.powerpoint.ppt"];
        
 UIDocumentPickerViewController *documentPickerViewController = [[UIDocumentPickerViewController alloc] initWithDocumentTypes:documentTypes                                                     inMode:UIDocumentPickerModeOpen];
 documentPickerViewController.delegate = self;
  [[self viewController] presentViewController:documentPickerViewController animated:YES completion:nil];

3.在UIDocumentPickerDelegate中处理回调事件

-(void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentAtURL:(NSURL *)url
{
    NSArray *array = [[url absoluteString] componentsSeparatedByString:@"/"];
    NSString *fileName = [array lastObject];
    fileName = [fileName stringByRemovingPercentEncoding];

    NSArray *fileArray=[fileName componentsSeparatedByString:@"."];
    
    //判断URL是否能找到，如果直接用url很可能找不到对应的文件
    BOOL canAccessingResource = [url startAccessingSecurityScopedResource];
    if(canAccessingResource) {
        NSFileCoordinator *fileCoordinator = [[NSFileCoordinator alloc] init];
        NSError *error;
        [fileCoordinator coordinateReadingItemAtURL:url options:0 error:&error byAccessor:^(NSURL *newURL) {
            NSData *fileData = [NSData dataWithContentsOfURL:newURL];
           
            //上传文件
           NSString *urlString2=@“”;

           [manager POST:urlString2 parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {

            //这里面可以追加参数或者上传的文件
            [formData appendPartWithFileData:fileData name:@"file" fileName:fileArray.firstObject mimeType:[NSString stringWithFormat:@"file/%@",fileArray.lastObject]];

             } progress:^(NSProgress * _Nonnull uploadProgress) {

              } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
                           
            } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {

             NSLog(@"%@",error);
            }];
        }];
        if (error) {
            // error handing
        }
    } else {
        // startAccessingSecurityScopedResource fail
    }
//    [url stopAccessingSecurityScopedResource];

}