参数化UIButton动作选择器在另一个类中的方法？ [英] Parameterized UIButton action selector for method in another class?

问题描述

这在很大程度上是一个句法问题。如何设置UIButton操作选择器来调用不同类的方法？我做了一个#import类的方法，我需要使用按钮调用，我有以下部分了解按钮代码应该是什么样子：

  UIButton * btnSplash = [UIButton buttonWithType：UIButtonTypeRoundedRect]; 
 btnSplash.frame = CGRectMake（250，270，180，30）; 
 [btnSplash setTitle：@MenuforState：UIControlStateNormal]; 
 [btnSplash addTarget：self action：@selector（[CLASS METHOD：PARAMETER]）forControlEvents：UIControlEventTouchUpInside]; 
 [self addSubview：btnSplash];但是，我收到以下错误：
 
  
预期'：'before'[@ token 
 
 
 
 @selector中缺少方法名
 
  
 
 
我在参考库中看到的示例代码调用了本地方法，所以我试图泛化，我的尝试迄今为止都是无效的。
 
 
 
感谢
解决方案
选择器是方法名称的表示，无论哪些类别或类别
 
 
 
假设你有一个类 AnotherClass ，它实现了方法  - ）doSomething：（id）sender 。对应的选择器是 doSomething：，在代码中表示为 @selector（doSomething：）。如果你想要按钮动作来调用该方法，你需要有一个 AnotherClass 的实例，并且这个实例是动作 target  ，而不是 self 。因此你的代码应该有：
  #importAnotherClass.h
 
 AnotherClass * instanceOfAnotherClass; 
 //将实例赋值给instanceOfAnotherClass 
 
 UIButton * btnSplash = [UIButton buttonWithType：UIButtonTypeRoundedRect]; 
 btnSplash.frame = CGRectMake（250，270，180，30）; 
 [btnSplash setTitle：@MenuforState：UIControlStateNormal]; 
 
 [btnSplash addTarget：instanceOfAnotherClass 
 action：@selector（doSomething :) 
 forControlEvents：UIControlEventTouchUpInside]; 
 
 [self addSubview：btnSplash]; 
  
 
This is largely a syntactical question. How does one set the UIButton action selector to call a method of a different class? I've done a #import of the class whose methods I need to call with the button and I have the following partial understanding of what the button code should look like:
    UIButton *btnSplash = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    btnSplash.frame = CGRectMake(250, 270, 180, 30);
    [btnSplash setTitle:@"Menu" forState:UIControlStateNormal];
    [btnSplash addTarget:self action:@selector([CLASS METHOD:PARAMETER]) forControlEvents:UIControlEventTouchUpInside];
    [self addSubview:btnSplash];
However, I get the following errors:

  
expected ':' before '[' token
  
  
method name missing in @selector
The sample code I've seen in the reference library calls local methods, so I'm trying to generalize and my attempts have thus far been unfruitful.

Thanks
解决方案
A selector is a representation of a method name regardless of which classes or categories implement it.

Say you have a class called AnotherClass which implements the method - (void)doSomething:(id)sender. The corresponding selector is doSomething:, represented in code as @selector(doSomething:). If you want the button action to invoke that method, you need to have an instance of AnotherClass — and it is this instance that is the action target, instead of self. Hence your code should have:
#import "AnotherClass.h"

AnotherClass *instanceOfAnotherClass;
// assign an instance to instanceOfAnotherClass

UIButton *btnSplash = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btnSplash.frame = CGRectMake(250, 270, 180, 30);
[btnSplash setTitle:@"Menu" forState:UIControlStateNormal];

[btnSplash addTarget:instanceOfAnotherClass
              action:@selector(doSomething:)
    forControlEvents:UIControlEventTouchUpInside];

[self addSubview:btnSplash];


                        
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