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```
