IOS开发（72）之监听捕获轻击的手势动作

1 前言
使用uitapgesturerecognizer 监听捕获用户点击了屏幕的事件。

2 代码实例
zyviewcontroller.m

 

[plain]
 (void)viewdidload 
{ 
    [super viewdidload]; 
    // do any additional setup after loading the view, typically from a nib. 
    self.view.backgroundcolor = [uicolor whitecolor]; 
    //创建手势 
    self.tapgesturerecognizer = [[uitapgesturerecognizer alloc] initwithtarget:self action:@selector(handletaps:)]; 
    /* 屏幕上必须有两个手指 */ 
    self.tapgesturerecognizer.numberoftouchesrequired = 2; 
    /* 必须敲击3下 */ 
    self.tapgesturerecognizer.numberoftapsrequired = 3; 
    [self.view addgesturerecognizer:self.tapgesturerecognizer]; 
     
} 
- (void) handletaps:(uitapgesturerecognizer*)paramsender{ 
    nsuinteger touchcounter = 0; 
    for (touchcounter = 0;touchcounter < paramsender.numberoftouchesrequired;touchcounter++){ 
        //获得手指位置 
        cgpoint touchpoint =[paramsender locationoftouch:touchcounter inview:paramsender.view]; 
        nslog(@"touch #%lu: %@",(unsigned long)touchcounter+1, nsstringfromcgpoint(touchpoint)); 
    } 
} 

- (void)viewdidload
{
    [super viewdidload];
 // do any additional setup after loading the view, typically from a nib.
    self.view.backgroundcolor = [uicolor whitecolor];
    //创建手势
    self.tapgesturerecognizer = [[uitapgesturerecognizer alloc] initwithtarget:self action:@selector(handletaps:)];
    /* 屏幕上必须有两个手指 */
    self.tapgesturerecognizer.numberoftouchesrequired = 2;
    /* 必须敲击3下 */
    self.tapgesturerecognizer.numberoftapsrequired = 3;
    [self.view addgesturerecognizer:self.tapgesturerecognizer];
   
}
- (void) handletaps:(uitapgesturerecognizer*)paramsender{
    nsuinteger touchcounter = 0;
    for (touchcounter = 0;touchcounter < paramsender.numberoftouchesrequired;touchcounter++){
        //获得手指位置
        cgpoint touchpoint =[paramsender locationoftouch:touchcounter inview:paramsender.view];
        nslog(@"touch #%lu: %@",(unsigned long)touchcounter+1, nsstringfromcgpoint(touchpoint));
    }
}
运行结果

两根手指连续三次点击屏幕后控制台显示

2013-05-13 15:58:36.524 uitapgesturetest[4482:c07] touch #1: {180, 321}

2013-05-13 15:58:36.525 uitapgesturetest[4482:c07] touch #2: {140, 119}