iOS 常用手勢

UIGestureRecognizer 對iOS的各種手勢進行了封裝，完全滿足了用戶對手勢的需求。

以下是對各種手勢的詳細應用和說明，希望能對大家有幫助。^_^

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor groupTableViewBackgroundColor];
    
    _imageView = [[UIImageView alloc]initWithFrame:CGRectMake((self.view.frame.size.width-150)/2, (self.view.frame.size.height-150)/2, 150, 150)];
    _imageView.userInteractionEnabled = YES;//交互使能，允許界面交互
    _imageView.image = [UIImage imageNamed:@"cat.png"];
    [self.view addSubview:_imageView];
    
    // 單擊的 TapRecognizer
    UITapGestureRecognizer *singleTap;
    singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(SingleTap:)];
    singleTap.numberOfTapsRequired = 1; //點擊的次數 ＝1 單擊
    
    [_imageView addGestureRecognizer:singleTap];//給對象添加一個手勢監測；
    
    // 雙擊的 TapRecognizer
    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(DoubleTap:)];
    doubleTap.numberOfTapsRequired = 2; //點擊的次數 ＝2 雙擊
    [_imageView addGestureRecognizer:doubleTap];//給對象添加一個手勢監測；
    
    /*
     1.雙擊手勢確定監測失敗才會觸發單擊手勢的相應操作，否則雙擊時第一擊時會響應單擊事件
     2.會造成單擊時要判斷是否是雙擊，調用單擊會有所延時。屬正常現象。
     */
    [singleTap requireGestureRecognizerToFail:doubleTap];
    
    
    //捏合縮放手勢 Pinch
    UIPinchGestureRecognizer *pinch;
    pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(handlePinch:)];
    //    [_imageView addGestureRecognizer:pinch];//添加到_imageView的時候，是要把手指放到_imageView操作
    [self.view addGestureRecognizer:pinch];//是self的時候，操作整個view都可以捏合_imageView（在響應事件中操作）
    pinch.delegate = self;
    
    
    //旋轉手勢 Rotation
    UIRotationGestureRecognizer *rotateRecognizer = [[UIRotationGestureRecognizer alloc]
                                                     initWithTarget:self
                                                     action:@selector(handleRotate:)];
    [self.view addGestureRecognizer:rotateRecognizer];//是self的時候，操作整個view都可以捏合_imageView（在響應事件中操作）
    rotateRecognizer.delegate = self;
    
    
    //滑動手勢 SwipeRecognizer
    UISwipeGestureRecognizer *swipeRecognizer = [[UISwipeGestureRecognizer alloc]
                                                 initWithTarget:self
                                                 action:@selector(handleSwipe:)];
    [self.view addGestureRecognizer:swipeRecognizer];//是self的時候，操作整個view都可以捏合_imageView（在響應事件中操作）
    swipeRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;//操作為左滑
    swipeRecognizer.delegate = self;

    
    //拖動手勢 PanRecognizer
    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc]
                                             initWithTarget:self
                                             action:@selector(handlePan:)];
    [_imageView addGestureRecognizer:panRecognizer];//關鍵語句，添加一個手勢監測；
    panRecognizer.maximumNumberOfTouches = 1;
    panRecognizer.delegate = self;
    
    //長按手勢 LongPressRecognizer
    UILongPressGestureRecognizer *longPressRecognizer = [[UILongPressGestureRecognizer alloc]
                                                         initWithTarget:self
                                                         action:@selector(handlelongPress:)];
    [_imageView addGestureRecognizer:longPressRecognizer];
    longPressRecognizer.minimumPressDuration = 1.0f;//觸髮長按事件時間為：1.0秒
    longPressRecognizer.delegate = self;
    
}

-(void)SingleTap:(UITapGestureRecognizer*)recognizer
{
    //處理單擊操作
    NSLog(@"單擊操作");
}

-(void)DoubleTap:(UITapGestureRecognizer*)recognizer
{
    //處理雙擊操作
    NSLog(@"雙擊操作");
}

- (void)handlePinch:(UIPinchGestureRecognizer*)recognizer
{
    NSLog(@"縮放操作");//處理縮放操作
    //對imageview縮放
    _imageView.transform = CGAffineTransformScale(_imageView.transform, recognizer.scale, recognizer.scale);
    //對self.view縮放，因為recognizer是添加在self.view上的
    //recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale);
    recognizer.scale = 1;
}

- (void)handleRotate:(UIRotationGestureRecognizer*) recognizer
{
    NSLog(@"旋轉操作");//處理旋轉操作
    //對imageview旋轉
    _imageView.transform = CGAffineTransformRotate(_imageView.transform, recognizer.rotation);
    //對self.view旋轉，因為recognizer是添加在self.view上的
    //    recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);
    recognizer.rotation = 0;
}

- (void)handleSwipe:(UISwipeGestureRecognizer*) recognizer
{
    //處理滑動操作
    if(recognizer.direction==UISwipeGestureRecognizerDirectionLeft) {
        NSLog(@"左滑滑動操作");
    }else if(recognizer.direction==UISwipeGestureRecognizerDirectionRight){
        NSLog(@"右滑滑動操作");
    }
}

-(void)handlePan:(UIPanGestureRecognizer*)recognizer
{
    NSLog(@"拖動操作");
    //處理拖動操作,拖動是基於imageview，如果經過旋轉，拖動方向也是相對imageview上下左右移動，而不是屏幕對上下左右
    CGPoint translation = [recognizer translationInView:_imageView];
    recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x,
                                         recognizer.view.center.y + translation.y);
    [recognizer setTranslation:CGPointZero inView:_imageView];
}

-(void)handlelongPress:(UILongPressGestureRecognizer*)recognizer
{
    //處理長按操作,開始結束都會調用，所以長按1次會執行2次
    if(recognizer.state == UIGestureRecognizerStateBegan){
        NSLog(@"開始長按操作");
    }else if(recognizer.state == UIGestureRecognizerStateEnded){
        NSLog(@"結束長按操作");
    }
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}