MapKit：未调用 setSelected(_:animated:)

Question

In the display map page, the annotationview is customized and I am overriding the setSelected(:) method in the implementation. However, when I click annotationView , the method is not called.

- (void)setSelected:(BOOL)select {
    [super setSelected:select];  
  
    NSLog(@"select:+++++ %d", select);
}

the NSLog not print, Why?

Answer 1

Direct Solution

If you only want a direct solution, this may help.

- (void)setSelected:(BOOL)select { 
    [super setSelected:select animated:YES]
  
    NSLog(@"select:+++++ %d", select);
}

---

Implementation

I am overriding the setSelected(_:animated:) method in the implementation

If so, I think you should override below method rather than - (void)setSelected:(BOOL)select , which is the Setter method of property selected .

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];
    .... // do your custom work
}

---

Why and How

After testing a lot, I find that Super Class must implentation this

- (void)setSelected:(BOOL)selected {
    
}

So you will get nothing when calling [super setSelected:select]

It's weird but may be reasonable If Apple does not recommend us to override selected 's Setter method as - (void)setSelected:(BOOL)select already do the job.

As you can see, this method exist in the most of System Class.