递归 请求队列实现

demo.m

//仅列出关键代码

@property (strong, nonatomic) NSArarry *datasArray;

- (void)beginUploadData {
 	     [self uploadDataToServer:self.datasArray[0] index:0];
 }
 
- (void)uploadDataToServer:(id)data index:(NSUInteger)index {
 	      AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
        manager.requestSerializer = [AFJSONRequestSerializer serializer];
        [manager POST:@"url"
           parameters:@{@"data":data}
              success:^(AFHTTPRequestOperation *operation, id responseObject) {
                     if(index == self.datasArray.count - 1) {
                     	     //最后一条数据上传成功
                     }
                     else {
                           //上传下一条数据
                     	   [self uploadDataToServer:self.datasArray[index + 1] index:index + 1];
                     }
              }
              failure:^(AFHTTPRequestOperation *operation,NSError *error)  { 
                        //提示错误 
              ];
}