[IOS]自定义长触屏事件

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