在Swift中完成方法时执行一个动作

Question

我想在完成一个方法时执行一个动作，在其他方法中执行一个方法，并且希望第二个方法停止，直到完成第一个方法。

我有一个方法：

func ejecutarOBJC(){ 
    let txtNombre = self.view.viewWithTag(4) as? UITextField 
    let textoNombre=txtNombre?.text 
    let txtContra = self.view.viewWithTag(5) as? UITextField 
    let textoContra=txtContra?.text 


    let instanceOfCustomObject: SQLViewController = SQLViewController() 
    instanceOfCustomObject.nombre = textoNombre; 
    instanceOfCustomObject.contra = textoContra; 
    instanceOfCustomObject.obtenerExistenciaUsuario() 

} 

而且还有另一种方法：

func otherMethod(){ 

    ejecutarOBJC() 

//I want continue with that method when the execution of the other method finish 

} 

Answer 1

这是你将如何实现这一目标：

func methodOne() { 

    //Method one code here 

    methodTwo() 

} 

func methodTwo() { 

    //Method Two code here. 

} 

根据您的评论，在这里使用异步代码时如何等待：

点

func methodOne() { 
    //Code goes here 
    methodTwo {() ->() in 
     //Method two has finished 
    } 
} 

func methodTwo(completion:() ->()) { 
    //Code goes here 
    completion() 
} 

Answer 2

使用闭：

func callCompetionFunction() 
{ 
    // Tira mola meseda (do your stuff) 

    completionFunction("a parameter") {() -> Void in 
     print("function copleted") 
    } 
} 

func completionFunction(param: AnyObject, completion:()->Void) 
{ 
    // Do your stuff 

    completion() 
} 

要在视图控制器

import UIKit 

class ViewController: UIViewController { 

override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 

    callCompetionFunction() 
} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 

func callCompetionFunction() 
{ 
    // Tira mola meseda (do your stuff) 
    print("do something here") 

    completionFunction("a parameter") {() -> Void in 
     print("function copleted") 
    } 
} 

func completionFunction(param: AnyObject, completion:()->Void) 
{ 
    // Do your stuff 
    if param is String 
    { 
     print("parameter = \(param)") 
    } 

    print("going to execute completion closure") 
    completion() 
} 


}