Ios 在UIView中未调用自定义setter

我正在使用bool属性的自定义setter，因为当这个值更改时，我需要做一些额外的工作。以下是我的实现：

MyView.h

@interface MyView : UIView 

@property (nonatomic) BOOL isSelected;

@end

MyView.m

@implementation MyView

@synthesize isSelected;

-(void)setIsSelected:(BOOL)_isSelected
{
    self.isSelected = _isSelected;

    //Custom code that changes UI based on bool state  


}

@end

---

然而，二传手并没有被召唤！有人能告诉我为什么吗？

尝试将

-（void）setIsSelected:

方法的参数

\u isSelected

更改为其他变量，例如

selected

，并使用它将属性指定为

\u isSelected=selected。
尝试将
-（void）setIsSelected:
方法的参数
\u isSelected
更改为其他变量，例如
selected
，并使用它将属性指定为
\u isSelected=selected。
调用两种设置属性和setter方法的方法

1、 点语法：self.isSelected=YES；
2、 直接打电话。[set-setIsSelected:是]

@interface MyView : UIView 
@property (nonatomic) BOOL isSelected;
@end

@implementation MyView
@synthesize isSelected;
-(void)setIsSelected:(BOOL)_isSelected
{
    isSelected = _isSelected;
    //Custom code that changes UI based on bool state  
}
@end

你的应用程序崩溃，因为你在setter方法中调用
self.isSelected=\u isSelected
，它将递归地、无休止地调用你的setter方法，直到堆栈溢出
 调用两种设置属性和setter方法的方法

1、 点语法：self.isSelected=YES；
2、 直接打电话。[set-setIsSelected:是]

@interface MyView : UIView 
@property (nonatomic) BOOL isSelected;
@end

@implementation MyView
@synthesize isSelected;
-(void)setIsSelected:(BOOL)_isSelected
{
    isSelected = _isSelected;
    //Custom code that changes UI based on bool state  
}
@end

你的应用程序崩溃，因为你在setter方法中调用
self.isSelected=\u isSelected
，它将递归地、无休止地调用你的setter方法，直到堆栈溢出
 例如，在viewDidLoad中，加载设置值
self.isSelected=YES，或要设置此值的位置

您的setter方法应该如下所示：

-(void)setIsSelected:(BOOL)seleted
{
    _isSelected = seleted;

    //Custom code that changes UI based on bool state


}

如果您在setter中使用该代码，这就是“setter循环”：
self.isSelected=\u isSelected
例如，在viewDidLoad set value
self.isSelected=YES，或要设置此值的位置

您的setter方法应该如下所示：

-(void)setIsSelected:(BOOL)seleted
{
    _isSelected = seleted;

    //Custom code that changes UI based on bool state


}

如果您在setter中使用该代码，这就是“setter循环”：
self.isSelected=\u isSelected
试试这个



   //in myView.h
   @interface customView : UIView
  {

  }
  @property(nonatomic)BOOL *isSelected;
  @end

    @implementation customView
    @synthesize isSelected = _isSelected;


    - (void)setIsSelected:(BOOL *)inSelected //inSelected is the in coming value for bool
    {
       _isSelected = inSelected;
       NSLog(@"setter is called");
    }



   //in myView.h
   @interface customView : UIView
  {

  }
  @property(nonatomic)BOOL *isSelected;
  @end

    @implementation customView
    @synthesize isSelected = _isSelected;


    - (void)setIsSelected:(BOOL *)inSelected //inSelected is the in coming value for bool
    {
       _isSelected = inSelected;
       NSLog(@"setter is called");
    }

在myView.m文件中



   //in myView.h
   @interface customView : UIView
  {

  }
  @property(nonatomic)BOOL *isSelected;
  @end

    @implementation customView
    @synthesize isSelected = _isSelected;


    - (void)setIsSelected:(BOOL *)inSelected //inSelected is the in coming value for bool
    {
       _isSelected = inSelected;
       NSLog(@"setter is called");
    }


试试这个

   //in myView.h
   @interface customView : UIView
  {

  }
  @property(nonatomic)BOOL *isSelected;
  @end

    @implementation customView
    @synthesize isSelected = _isSelected;


    - (void)setIsSelected:(BOOL *)inSelected //inSelected is the in coming value for bool
    {
       _isSelected = inSelected;
       NSLog(@"setter is called");
    }



   //in myView.h
   @interface customView : UIView
  {

  }
  @property(nonatomic)BOOL *isSelected;
  @end

    @implementation customView
    @synthesize isSelected = _isSelected;


    - (void)setIsSelected:(BOOL *)inSelected //inSelected is the in coming value for bool
    {
       _isSelected = inSelected;
       NSLog(@"setter is called");
    }



   //in myView.h
   @interface customView : UIView
  {

  }
  @property(nonatomic)BOOL *isSelected;
  @end

    @implementation customView
    @synthesize isSelected = _isSelected;


    - (void)setIsSelected:(BOOL *)inSelected //inSelected is the in coming value for bool
    {
       _isSelected = inSelected;
       NSLog(@"setter is called");
    }

在myView.m文件中



   //in myView.h
   @interface customView : UIView
  {

  }
  @property(nonatomic)BOOL *isSelected;
  @end

    @implementation customView
    @synthesize isSelected = _isSelected;


    - (void)setIsSelected:(BOOL *)inSelected //inSelected is the in coming value for bool
    {
       _isSelected = inSelected;
       NSLog(@"setter is called");
    }


在某些情况下，当对象为nil时，它会给您一种不调用setter和getter的感觉。希望您能解决这个问题。
在某些情况下，当您的对象为nil时，它会让您感觉到setter和getter没有被调用。希望您能解决这个问题。
当您希望调用setter方法时，如何设置属性？更多不能在setter方法中使用点符号设置属性。在同一个类中，我。。。isSelected=是；您应该执行
self.isSelected=YES当您希望调用setter方法时，如何设置属性？更多不能在setter方法中使用点符号设置属性。在同一个类中，我。。。isSelected=是；您应该执行
self.isSelected=YES我这样做了。它会导致应用程序在具有EXC_BAD_access的setter中崩溃，这是我做的。它会导致应用程序在setter中崩溃，并带有EXC_BAD_access谢谢，这可以修复它！我想我可以在下一次iOS面试中问这个问题！：-）谢谢，这就解决了！我想我可以在下一次iOS面试中问这个问题！：-）谢谢，这就解决了！我想我可以在下一次iOS面试中问这个问题！：-）谢谢，这就解决了！我想我可以在下一次iOS面试中问这个问题！：-）亚伦最好把你的答案写出来。作为对用户问题的评论。Aaron最好给出你的答案。作为对用户问题的评论。
   //in myView.h
   @interface customView : UIView
  {

  }
  @property(nonatomic)BOOL *isSelected;
  @end

    @implementation customView
    @synthesize isSelected = _isSelected;


    - (void)setIsSelected:(BOOL *)inSelected //inSelected is the in coming value for bool
    {
       _isSelected = inSelected;
       NSLog(@"setter is called");
    }