迅速完成Firebase完成侦听器 [英] Firebase completion listeners in swift

问题描述

你如何在swift中执行firebase的完成监听器？它表示在文档中有SetValue和UpdateValue的完成监听器，但是没有例子。

解决方案

setValue的完成是在{}块（闭包）内处理。因此，一旦尝试setValue，该块内的代码执行。错误将是零如果没有和快照将被写入的数据。

  let ref = self.myRootRef.child（some_path）
 ref.setValue（Hello，withCompletionBlock ：$ {
 print（oops，an error）
} else {
 print（completed）
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 $ 
 
  root_ref 
 some_path：您好
  
 
 
打印完成
 
How do you execute a completion listener for firebase in swift? It says there are completion listers for SetValue and UpdateValue in the docs but there is no example.
解决方案
The completion of a setValue is handled within the {} block (closure). So once the attempt to setValue is made, the code within that block executes. error will be nil if none and snapshot will be the data that was written.   
let ref = self.myRootRef.child("some_path")
    ref.setValue("Hello", withCompletionBlock: { (error, snapshot) in
        if error != nil {
            print("oops, an error")
        } else {
            print("completed")
        }
    })
gives a result of
root_ref
   some_path: Hello
and prints "completed"

                        
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