从另一个类调用的选择器函数

I have a viewController Controller and a view view A. Also ViewA contains a button. Generally, we call a function in the same class to be executed when clicked on button. But I want a method in controller to be executed when clicked on button.

我有一个viewController控制器和一个视图A.此外，ViewA包含一个按钮。通常，我们在单击按钮时调用同一类中的函数。但我希望在单击按钮时执行控制器中的方法。

Following are the two methods I have worked out:

以下是我制定的两种方法：

//method 1 
//UIView A
-(id)initWithSelector:(SEL)callbackInB withDelegate:(id)delagateB
{
    self = [super init];
    if (self)
    {
         delegate = delegateB;
         myCB = callbackInB;
    }
    return self;
}
//somewhere in UIView A
[btn addTarget:delegate action:myCB forControlEvents:UIControlEventTouchUpInside];

This works fine .But instead of this if I do as second method , it shows "perform selector may leak as the selector function is unknown" .

这样可以正常工作。但如果我做第二种方法，它会显示“执行选择器可能会因选择器功能未知而泄漏”。

//method 2
//somewhere in UIView A 
[btn addTarget:self action:@selector(btnPressed:) forControlEvents:UIControlEventTouchUpInside];


-(void)btnPressed:(id)sender
{

    if([delegate respondsToSelector:myCB])
        [delegate performSelector:myCB];

}

1 个解决方案

#1

Blocks are the answer to this problem:

块是这个问题的答案：

Class B

B级

@property (copy, nonatomic) void (^myBlock)(void);

 -(id)initWithMyBlock:(void(^)(void))block
 {
    self = [super init];
    if (self)
    {
         self.myBlock = block;
    }
     return self;
 }

[btn addTarget:delegate action:@selector(btnPressed) forControlEvents:UIControlEventTouchUpInside];

- (void)btnPressed {
  if (_myBlock) {
    _myBlock();
  }
}

Just watch out for retain cycles

请注意保留周期

#1