IOS手势小结...

- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    //实例化图片视图对象    UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 100, 320, 320)];    //设置图片背景颜色    imageView.backgroundColor=[UIColor redColor];    //将图片视图对象添加到根视图对象上    [self.view addSubview:imageView];    //设置图片视图对象的一组动态图片    imageView.animationImages=[self animationImages];    imageView.animationDuration=2;//遍历一遍需要的时间    imageView.animationRepeatCount=-1;//重复次数,-1表示无数次    [imageView startAnimating];        //实例化开始按钮对象,大小(100,30)位置从根视图坐标系统的原点偏移(110,440),按钮初始文字"开始"    //按钮触发事件,didClickButton;self,按钮变量名,button    UIButton *button=[[UIButton alloc]initWithFrame:CGRectMake(110, 440, 100, 30)];    [button setTitle:@"开始" forState:UIControlStateNormal];    button.backgroundColor=[UIColor orangeColor];    [button addTarget:self action:@selector(didClickButton:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button];}-(void)didClickButton:(UIButton *)button{    if ([button.titleLabel.text isEqualToString:@"开始"]) {        [button setTitle:@"结束" forState:UIControlStateNormal];        return;    }    [button setTitle:@"开始" forState:UIControlStateNormal];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}//加载动态图片-(NSArray *)animationImages{    //用来存储图片的名字,路径    NSMutableArray *array=[NSMutableArray new];    //程序安装包的根路径    NSString *rootPath=[[NSBundle mainBundle]resourcePath];    //图片文件的路径    NSString *imageDirectiory=[rootPath stringByAppendingString:@"/ImagePackage"];    //遍历生成40张图片路径    for (NSInteger index=1; index<=40; index++) {        NSString *imagePath=[imageDirectiory stringByAppendingFormat:@"/2250_3650903_179fb89ae279fae－%d（被拖移）.tiff",index];        //用文件内容初始化成一张图片        UIImage *image=[[UIImage alloc]initWithContentsOfFile:imagePath];        //每一张图片路径添加到数组内        [array addObject:image];    }    return array;}@endUIEvent,事件分三类:触摸事件/晃动事件/远程控制事件UIResponder是基类,所有UIView派生出来的UIKit类都源自他,他继承与NSObject第一响应者是应用程序中当前负责接受触摸事件的响应者对象.响应者链:硬件--响应者--application--window--viewController--View.1,在一定时间内关闭事件传递:应用程序调用UIApplication的beginIgnoringInteractionEvents和endIgnoringInteractionEvents 2,UIGestureRecognizer  tap longTap swipe rotation pan平移 pinch捏合  //实例化图像视图    UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(10, 100, 300, 300)];    UIImage *image=[UIImage imageNamed:@"test"];    imageView.image=image;    imageView.userInteractionEnabled=YES;   //    UITapGestureRecognizer:UIGestureRecognizer               点击   //    UISwipeGestureRecognizer:UIGestureRecognizer            轻扫   //    UILongPressGestureRecognizer:UIGestureRecognizer      长按   //    UIPanGestureRecognizer:UIGestureRecognizer                拖拽   //    UIPinchGestureRecognizer:UIGestureRecognizer              捏合   //    UIRotationGestureRecognizer:UIGestureRecognizer          翻转    UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]init];    //点击需要的手指头个数    [tapGesture setNumberOfTouchesRequired:1];    //点击需要的次数    [tapGesture setNumberOfTapsRequired:1];    //添加手势成功识别后的动作及发送对象    [tapGesture addTarget:self action:@selector(_tapMethods:)];    [self.view addSubview:imageView];   // [imageView addGestureRecognizer:tapGesture];        UILongPressGestureRecognizer *longPress=[[UILongPressGestureRecognizer alloc]init];    [longPress setNumberOfTapsRequired:1];    [longPress setNumberOfTouchesRequired:1];     //最小识别时长    [longPress setMinimumPressDuration:0.1];    //设置允许的误差    [longPress setAllowableMovement:12];    //添加目标动作    [longPress addTarget:self action:@selector(longMethod:)];    [imageView addGestureRecognizer:longPress];}-(void)longMethod:(UILongPressGestureRecognizer *)sender{    NSLog(@"%s",__FUNCTION__);}-(void)_tapMethods:(UITapGestureRecognizer *)tap{    UIActionSheet *actionSheet=[[UIActionSheet alloc]initWithTitle:@"温馨提示" delegate:Nil cancelButtonTitle:@"cancel" destructiveButtonTitle:@"点击" otherButtonTitles:@"Ok", nil];    [actionSheet showInView:self.view];    }最后重点如下代码有什么问题? UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(labelOnClick:)];    tap.numberOfTapsRequired=1;    tap.numberOfTouchesRequired=1;           self.label.userInteractionEnabled=YES;    [self.label addGestureRecognizer:tap];    [self.button addGestureRecognizer:tap];-(void)labelOnClick:sender{    NSLog(@"label on click");}发现label的手势不起作用,原因有两点:1,label默认UserInteractionEnabled为no,需要设置[self.label setUserInteractionEnabled:YES];2,手势对应一个事件,并且对应一个控件,如果label和button用同一个手势,只有后来使用的才会有效果.