写一个Demo来自定义一个长触屏事件,自定义长按手势。
实现步骤：
1.创建一个自定义手势类，命名为LongPressGestureRecognizer,在创建的时候继承UIGestureRecognizer
LongPressGestuRecognizer.h:
#import <UIKit/UIKit.h> @interface LongPressGestureRecognizer : UIGestureRecognizer @end
LongPressGestuRecognizer.m:
#import "LongPressGestureRecognizer.h"
#import <UIKit/UIGestureRecognizerSubclass.h>
#import <time.h>
NSInteger timer1;
NSInteger timer2;
@implementation LongPressGestureRecognizer
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesBegan:touches withEvent:event];
NSDate *nowDate = [NSDate date];
NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init];
[dateformatter setDateFormat:@"ss"];
timer1 = [[dateformatter stringFromDate:nowDate] integerValue];
[dateformatter release];
NSLog(@"%d",timer1);
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesEnded:touches withEvent:event];
NSDate *nowDate = [NSDate date];
NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init];
[dateformatter setDateFormat:@"ss"];
[dateformatter release];
NSLog(@"%d",timer1);
if ((timer2 -timer1) >= 2)
{
self.state = UIGestureRecognizerStateEnded;
}
}
@end
2.修改主ViewController
ViewController.h:
#import <UIKit/UIKit.h> @interface DXWViewController : UIViewController<UIGestureRecognizerDelegate> @end
ViewController.m:
#import "DXWViewController.h"
#import "LongPressGestureRecognizer.h"
@interface DXWViewController ()
@end
@implementation DXWViewController
- (void)viewDidLoad
{
[super viewDidLoad];
LongPressGestureRecognizer * longPress = [[LongPressGestureRecognizer alloc] initWithTarget:self action:@selector(LongPress:)];
[self.view addGestureRecognizer:longPress];
}
-(void)LongPress:(LongPressGestureRecognizer *)my
{
NSLog(@"OK");
}
@end
3.ViewController中的触屏事件touchesBegan和自定义手势中的touchesBegan区别：
ViewController中的touchesBegan是针对整个View而言的，而自定义中的手势是要绑定到某个特定的view，只针对这个view才相应的手势事件
