[IOS]自訂長觸屏事件

寫一個Demo來自訂一個長觸屏事件,自訂長按手勢。實現步驟：1.建立一個自訂手勢類，命名為LongPressGestureRecognizer,在建立的時候繼承UIGestureRecognizerLongPressGestuRecognizer.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ViewControllerViewController.h: 

#import <UIKit/UIKit.h>    @interface DXWViewController : UIViewController<UIGestureRecognizerDelegate>    @end  ViewController.m:[plain] view plaincopyprint?#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中的觸屏事件touchesBegan和自訂手勢中的touchesBegan區別：                                              ViewController中的touchesBegan是針對整個View而言的，而自訂中的手勢是要綁定到某個特定的view，只針對這個view才相應的手勢事件