[IOS]觸摸事件和手勢

如何使用IOS中的觸摸事件和手勢，這也是增加我們IOS應用的一個重要的一個功能？下面我來用一個簡單的Demo來入門一下吧！

實現(xiàn)的功能具備右滑動和雙擊操作：

雙擊切換圖片：

友情提醒：要實現(xiàn)兩點滑動，按住alt鍵和shift鍵試試

操作步驟：

1.創(chuàng)建一個SingleView的項目，在頁面上添加一個子view和幾個label；

2.ViewController.h:

#import <UIKit/UIKit.h>  @interface DXWViewController : UIViewController @property (retain, nonatomic) IBOutlet UILabel *state; @property (retain, nonatomic) IBOutlet UILabel *tapCount; @property (retain, nonatomic) IBOutlet UILabel *xPoint; @property (retain, nonatomic) IBOutlet UILabel *yPoint; @property (retain, nonatomic) IBOutlet UILabel *touchNum; @property (retain, nonatomic) IBOutlet UIView *otherView; @property(retain,nonatomic)UIImageView *imgView; @property(retain,nonatomic)UIImage *img; @end

3.ViewController.m:

#import "DXWViewController.h"  @interface DXWViewController ()  @end  @implementation DXWViewController  //加載圖片 -(void)loadimag:(NSString *)imgName {     self.img = [UIImage imageNamed:imgName];     self.imgView = [[UIImageView alloc] initWithImage:self.img];     CGRect rec = CGRectMake(5, 5, 150, 117);     self.imgView.frame = rec;     [self.otherView addSubview:self.imgView];          [self.imgView release]; }  - (void)viewDidLoad {     [super viewDidLoad];     self.img = [UIImage imageNamed:@"flower1.jpg"]; 	//花開     [self loadimag:@"flower1.jpg"];      }  -(void)fun:(NSSet *)touches {     UITouch *touch = [touches anyObject];     int tapCount = [touch tapCount];     CGPoint point = [touch locationInView:self.view];          self.tapCount.text = [NSString stringWithFormat:@"tapCount %d",tapCount];     int touchNum = [touches count];     self.xPoint.text = [NSString stringWithFormat:@"x %.1f",point.x];     self.yPoint.text = [NSString stringWithFormat:@"y %.1f",point.y];     //接受多點，要設置允許多點     self.touchNum.text = [NSString stringWithFormat:@"touchNum %d",touchNum];  } //返回點擊次數(shù) -(int)getNumber:(NSSet *)touches {     UITouch *touch = [touches anyObject];     int tapCount = [touch tapCount];     CGPoint point = [touch locationInView:self.view];          self.tapCount.text = [NSString stringWithFormat:@"tapCount %d",tapCount];     int touchNum = [touches count];     self.xPoint.text = [NSString stringWithFormat:@"x %.1f",point.x];     self.yPoint.text = [NSString stringWithFormat:@"y %.1f",point.y];     //接受多點，要設置允許多點     self.touchNum.text = [NSString stringWithFormat:@"touchNum %d",touchNum];     return tapCount;      } BOOL flag = true;  float x=0;  //支持多點 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {          //如果有子view的話如何獲取子view的觸摸事件     //touches = [event touchesForView:self.otherView];     self.state.text = @"touchesBegin";     [self fun:touches];     [self fun:[event touchesForView:self.otherView]];               if ([self getNumber:[event touchesForView:self.otherView]] == 2) {         if (flag) {                          [self loadimag:@"flower.jpg"];             flag = false;         }         else         {             [self loadimag:@"flower1.jpg"];             flag = true;         }     }               UITouch *touch = [touches anyObject];     CGPoint point = [touch locationInView:self.otherView];     x = point.x;          } -(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {      } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {      } -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {     //自己自定義手勢     UITouch *touch = [touches anyObject];     CGPoint point = [touch locationInView:self.otherView];     float moveX = 0;     moveX = point.x;     if ((moveX-x)>100) {         NSLog(@"右滑");     } }  - (void)dealloc {     [_state release];     [_tapCount release];     [_xPoint release];     [_yPoint release];     [_touchNum release];     [_otherView release];     [super dealloc]; } @end 

4.要注意，要把頁面設置一下，設置能多點識別的屬性。

5.也可以通過拖放一個手勢控件來實現(xiàn)手勢，在頁面中有一個Swipe Gesture Recognizer的手勢控件

- (void)viewDidLoad {     [super viewDidLoad];     //代碼創(chuàng)建手勢     UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(gesture:)];     swipe.direction = UISwipeGestureRecognizerDirectionRight | UISwipeGestureRecognizerDirectionLeft;          //添加上手勢，控件添加     [self.view addGestureRecognizer:swipe]; }  -(void)gesture:(id)sender {     NSLog(@"left or right"); }  - (IBAction)swipe:(id)sender {     NSLog(@"right"); }

6.實現(xiàn)單擊/雙擊觸發(fā)事件        

-(void)viewLoad { //點擊事件     UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(fun1)];     //單點觸摸     tap.numberOfTouchesRequired = 1;     //點擊幾次，如果是1就是單擊     tap.numberOfTapsRequired = 1;     [self.view addGestureRecognizer:tap]; }  //一次點擊事件 -(void)fun1 {     NSLog(@"click1"); } 

==================== 迂者 丁小未 CSDN博客專欄=================

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