ios - 保留计数并从Fromview移除

Question

我有一个UIView，初始化时它已经保留了2，我不明白为什么，因此无法使用removefromsuperview将其删除

ViewController.h

  @property (nonatomic, retain)FinalAlgView * drawView;

ViewController.m

  self.drawView =[[FinalAlgView alloc]init];

 NSLog(@"the retain count 1 of drawView is %d", [self.drawView retainCount]);
 //the retain count 1 of drawView is 2

 [self.bookReader addSubview:self.drawView];

 NSLog(@"the retain count 2 of drawView is %d", [self.drawView retainCount]);
 //the retain count 2 of drawView is 3

 [self.drawView release];

 NSLog(@"the retain count 3 of drawView is %d", [self.drawView retainCount]);
 //the retain count 3 of drawView is 2

 [UIView animateWithDuration:0.2
                 animations:^{self.drawView.alpha = 0.0;}
                 completion:^(BOOL finished){ [self.drawView removeFromSuperview];
                 }]; 
 //do not remove

我不使用ARC

Answer 1

您不能指望retainCount会导致混乱的结果，最好不要使用它。

从Apple:

...从这种方法中很难获得有用的信息。