IOS开发中异步网络请求上实现同步逻辑

- (void)uploadFile:(NSArray *)imageArray atIndex:(NSInteger)index imagesCount:(NSInteger)count completeBlock:(uploadCompleteBlock)block {
 FNCircleImage *aTCImage = imageArray[index];
 NSString *filepath = aTCImage.localFilePath;
 [self.resourceManager upload:filepath progress:nil completion:^(NSString * _Nullable urlString, NSError * _Nullable error) {
  if (error == nil) {
   aTCImage.remoteUrl = urlString;

   NSInteger idx = index + 1;
   if (idx >= count) {
    block(nil);
   } else {
    [self uploadFile:imageArray atIndex:idx imagesCount:count completeBlock:block];
   }
  } else {
   block(error);
  }
 }];
}

__block NSError *e = nil;
[imageArray enumerateObjectsUsingBlock:^(NSString *filePath, NSUInteger idx, BOOL * _Nonnull stop) {
 __block dispatch_semaphore_t t = dispatch_semaphore_create(0);
 [self upload:filepath progress:nil completion:^(NSString * _Nullable urlString, NSError * _Nullable error) {
  if (error == nil) {
   
  } else {
   e = error;
   *stop = YES;
  }
  dispatch_semaphore_signal(t);
 }];
 dispatch_semaphore_wait(t, DISPATCH_TIME_FOREVER);
}];