UISwipeGestureRecognizer ---手指动作(转)

tap是指轻触手势。类似鼠标操作的点击。从iOS 3.2版本开始支持完善的手势api：

• tap：轻触
• long press：在一点上长按
• pinch：两个指头捏或者放的操作
• pan：手指的拖动
• swipe：手指在屏幕上很快的滑动
• rotation：手指反向操作

这为开发者编写手势识别操作，提供了很大的方便，想想之前用android写手势滑动的代码（编写android简单的手势切换视图示例），尤其感到幸福。

这里写一个简单的tap操作。在下面视图的蓝色视图内增加对tap的识别：

当用手指tap蓝色视图的时候，打印日志输出：

代码很简单，首先要声明tap的recognizer：

UITapGestureRecognizer *recognizer=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapFrom:)]; 
[infoView addGestureRecognizer:recognizer]; 
[recognizer release];

在这里：

• initWithTarget:self，要引用到Controller，因为一般这部分代码写在controller中，用self；
• action:@selector(handleTapFrom:)，赋值一个方法名，用于当手势事件发生后的回调；
• [infoView addGestureRecognizer:recognizer]，为view注册这个手势识别对象，这样当手指在该视图区域内，可引发手势，之外则不会引发

对应的回调方法：

-(void)handleTapFrom:(UITapGestureRecognizer *)recognizer{ 
    NSLog(@">>>tap it"); 
}

controller相关方法完整的代码（包含了一些与本文无关的视图构建代码）：

// Implement loadView to create a view hierarchy programmatically, without using a nib. 
- (void)loadView { 
    //去掉最顶端的状态拦 
    [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation: UIStatusBarAnimationSlide]; 
    
    UIImage *image=[UIImage imageNamed:@"3.jpg"]; 
    
    //创建背景视图 
    self.view=[[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]]; 
    UIImageView *backgroudView=[[UIImageView alloc] initWithImage:image]; 
    [self.view addSubview:backgroudView]; 
    
    /* 
    UIToolbar *toolBar=[[UIToolbar alloc] initWithFrame:CGRectMake(0, 1024-70, 768, 70)]; 
    toolBar.alpha=0.8; 
    toolBar.tintColor = [UIColor colorWithRed:.3 green:.5 blue:.6 alpha:.1]; 
    
    NSArray *items=[NSArray arrayWithObjects:[[UIBarButtonItem alloc] initWithTitle:@"test" style:UIBarButtonItemStyleDone target:self action:nil],nil]; 
    toolBar.items=items; 
    [self.view addSubview:toolBar]; 
    */ 
    
    UIView *bottomView=[[UIView alloc]  initWithFrame:CGRectMake(0, 1024-70, 768, 70)]; 
    bottomView.backgroundColor=[UIColor grayColor]; 
    bottomView.alpha=0.8; 
    
    //UIButton *backButton=[[UIButton alloc] initWithFrame:CGRectMake(10, 10, 100, 40)]; 
    UIButton *backButton=[UIButton buttonWithType: UIButtonTypeRoundedRect]; 
    [backButton setTitle:@"ok" forState:UIControlStateNormal]; 
    backButton.frame=CGRectMake(10, 15, 100, 40); 
    
    [bottomView addSubview:backButton]; 
    
    [self.view addSubview:bottomView]; 
    
    UIView *infoView=[[UIView alloc] initWithFrame:CGRectMake(200, 700, 768-400, 70)]; 
    infoView.backgroundColor=[UIColor blueColor]; 
    infoView.alpha=0.6; 
    infoView.layer.cornerRadius=6; 
    infoView.layer.masksToBounds=YES; 
    [self.view addSubview:infoView]; 
    
    UITapGestureRecognizer *recognizer=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapFrom:)]; 
    [infoView addGestureRecognizer:recognizer]; 
    [recognizer release]; 
}

-(void)handleTapFrom:(UITapGestureRecognizer *)recognizer{ 
    NSLog(@">>>tap it"); 
}