iOS手勢辨識器

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UIGestureRecognizer

UIGestureRecognizer類,用於檢測、識別使用者使用裝置時所用的手勢.它是一個抽象類別,定義了所有手勢的基本行為.以下是UIGestureRecognizer子類,用於處理具體的使用者手勢行為:

UITapGestureRecognizer // 1.單擊
UILongPressGestureRecognizer // 3.長按
UISwipeGestureRecognizer // 4.輕掃
UIPanGestureRecognizer // 5.移動
UIRotationGestureRecognizer // 6.旋轉
UIPinchGestureRecognizer // 7.捏合

建立手勢:

    // 1.單擊    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];    [imgView addGestureRecognizer:tap];        // 2.雙擊    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTapAction:)];    doubleTap.numberOfTapsRequired = 2;    [imgView addGestureRecognizer:doubleTap];        // 雙擊失敗才單擊    [tap requireGestureRecognizerToFail:doubleTap];        // 3.長按    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressAction:)];    //設定最短時間    longPress.minimumPressDuration = 1;    [imgView addGestureRecognizer:longPress];            // 4.輕掃    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAction:)];    // 設定輕掃方向    [swipe setDirection:UISwipeGestureRecognizerDirectionRight];    [imgView addGestureRecognizer:swipe];        // 5.移動    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];    [imgView addGestureRecognizer:pan];        // 輕掃失敗才移動    [pan requireGestureRecognizerToFail:swipe];        // 6.旋轉    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];    [imgView addGestureRecognizer:rotation];        // 7.捏合    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];    [imgView addGestureRecognizer:pinch];

手勢觸發事件：

GestureAction:

-(void)longPressAction:(UILongPressGestureRecognizer *)longPress{    if (longPress.state == UIGestureRecognizerStateBegan) {        NSLog(@"長按開始");    }else if (longPress.state == UIGestureRecognizerStateEnded){        NSLog(@"長按結束");    }}- (void)panAction:(UIPanGestureRecognizer *)pan {    //手指所在的座標    CGPoint point = [pan locationInView:self.view];    _view.center = point;}- (void)rotationAction:(UIRotationGestureRecognizer *)rotation{    if (rotation.state == UIGestureRecognizerStateChanged) {                //取到弧度        CGFloat angle = rotation.rotation;                //正在旋轉        rotation.view.transform = CGAffineTransformMakeRotation(angle);            } else if (rotation.state == UIGestureRecognizerStateEnded) {                //還原        [UIView animateWithDuration:.5 animations:^{                        rotation.view.transform = CGAffineTransformIdentity;        }];    }}- (void)pinchAction:(UIPinchGestureRecognizer *)pinch{    if (pinch.state == UIGestureRecognizerStateChanged) {                // 取到縮放比率        CGFloat scale = pinch.scale;                // 縮放        pinch.view.transform = CGAffineTransformMakeScale(scale, scale);            } else if (pinch.state == UIGestureRecognizerStateEnded) {                [UIView animateWithDuration:.5 animations:^{                        pinch.view.transform = CGAffineTransformIdentity;        }];    }}

Motion 搖晃手勢 

//讓當前對象成為第一響應者- (BOOL)canBecomeFirstResponder{             return YES;}- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event{   NSLog(@"搖一搖開始");}- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event{   NSLog(@"搖一搖結束");}

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iOS手勢辨識器