若直接判断tapCount的次数调用相应的方法,那么为出现奇怪的现象,双击的时候会先调用单击方法,再调用双击方法,那么我们如何解决该问题呢?
** 解决方法:
1.若tapCount==1 延迟调用单击方法(为了判断是否实单双击的处理)**

if (count == 1) {
        [self performSelector:@selector(sigleTapAction) withObject:nil afterDelay:0.3];
    }```
**2.若tapCount==2,先取消单击方法的调用,再调用双击方法**

if (count == 2) {
//取消单击
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(sigleTapAction) object:nil];
[self doubleTapAction];
}

*代码如下:*

import "ViewController.h"

import "MyView.h"

@interface ViewController ()

@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];

  MyView *view = [[MyView alloc] initWithFrame:CGRectMake(50, 200, 200, 200)];
  view.backgroundColor = [UIColor orangeColor];
  [self.view addSubview:view];

}

@end

import "MyView.h"

@implementation MyView

• (instancetype)initWithFrame:(CGRect)frame
  {
  self = [super initWithFrame:frame];
  if (self) {

  }
  return self;
  }

• (void) sigleTapAction{
  NSLog(@"单击");
  }

• (void) doubleTapAction {

  NSLog(@"双击");
  }
  //当一个或多个手指触碰到屏幕时

• (void) touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

  UITouch *touch = [touches anyObject];
  NSInteger count = [touch tapCount];
  //问题:当你双击的时候,会调用单击的方法.

  //重点:双击事件取消单击
  if (count == 1) {
  [self performSelector:@selector(sigleTapAction) withObject:nil afterDelay:0.3];
  }
  if (count == 2) {
  //取消单击
  [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(sigleTapAction) object:nil];
  [self doubleTapAction];
  }
  }

@end```

运行效果: