iOS的基本手勢

標籤：

1.點選手勢：

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTapGesture:)];
    //設定點擊次序，識別手勢的時候使用
    tapGesture.numberOfTapsRequired = 2;

2.長按手勢：

 UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(handleLongPressGesture:)];
    //設定按壓最短期間，預設0.5s
    longPress.minimumPressDuration = 1;

3.滑動手勢：

UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePanGesture:)];
    [view addGestureRecognizer:panGesture];

4.捏合手勢：

 UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(handlePinchGesture:)];
    pinchGesture.delegate = self;
5.旋轉手勢：

UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(handleRotationGesture:)];
    rotationGesture.delegate = self;
#pragma mark -
#pragma mark Handle Gesture Recoginzer

- (void)handleRotationGesture:(UIRotationGestureRecognizer*)gesture{
    if (gesture.state == UIGestureRecognizerStateBegan || gesture.state == UIGestureRecognizerStateChanged) {
        UIView *view = gesture.view;
        [self.view bringSubviewToFront:view];
        //旋轉的弧度
        CGFloat rotation = gesture.rotation;
        view.transform = CGAffineTransformRotate(view.transform, rotation);
        
        //注意有累加
        gesture.rotation = 0.0;
    }
}

- (void)handlePinchGesture:(UIPinchGestureRecognizer*)gesture
{
    if (gesture.state == UIGestureRecognizerStateBegan || gesture.state == UIGestureRecognizerStateChanged) {
        UIView *view = gesture.view;
        [self.view bringSubviewToFront:view];
        //得到縮放的比例，然後設定transform的縮放參數
        //gesture.scale 捏合時候的縮放比例
        CGFloat scale = gesture.scale;
        
        //設定view.transform scale 代表縮放
        //第一個參數，是基準值，在此基礎上進行縮放
        //第二個參數，x 座標方向的縮放比例
        //第三個參數，y 座標方向的縮放比例
        view.transform = CGAffineTransformScale(view.transform, scale, scale);
        
        //由於手勢效果會累積,所以需要給他複位
        gesture.scale = 1.0;
    }
}

- (void)handlePanGesture:(UIPanGestureRecognizer*)gesture
{
    if (gesture.state == UIGestureRecognizerStateBegan || gesture.state == UIGestureRecognizerStateChanged) {
        //手勢識別成功，並且手勢持續進行中
        UIView *view = gesture.view;
        [self.view bringSubviewToFront:view];
        //手勢在self.view上移動的多少
        CGPoint offset = [gesture translationInView:self.view];
        CGPoint newCenter = CGPointMake(view.center.x+offset.x, view.center.y+offset.y);
        view.center = newCenter;
        
        //手勢的效果會累加，translation一直累加
        //重新初始化，去除原來的累加效果
        [gesture setTranslation:CGPointZero inView:self.view];
    }
}

//點選手勢處理
- (void)handleTapGesture:(UITapGestureRecognizer*)gesture
{
    //gesture.view; 代表手勢發生在哪一個view上
    NSLog(@"點擊了2次，手勢識別成功");
}

//手勢識別的過程，首先接受到touchbegin的事件，開始啟動手勢識別，手勢的狀態
//UIGestureRecognizerStatePossible,然後繼續接收並分析觸摸事件，如果手勢識別成功，手勢的狀態變為UIGestureRecognizerStateBegan
//如果手勢繼續進行，手勢的狀態變為UIGestureRecognizerStateChanged
//如果手勢結束，狀態變為UIGestureRecognizerStateEnded
//如果手勢識別失敗 UIGestureRecognizerStateFailed
- (void)handleLongPressGesture:(UILongPressGestureRecognizer*)gestrue
{
    if (gestrue.state == UIGestureRecognizerStateBegan || gestrue.state == UIGestureRecognizerStateChanged) {
        NSLog(@"長按手勢識別成功");
    }
    if (gestrue.state == UIGestureRecognizerStateEnded) {
        NSLog(@"手勢識別結束");
    }
}

#pragma mark -
#pragma mark UIGestureReconigerDelegate
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    if (gestureRecognizer.view == otherGestureRecognizer.view) {
        return YES;
    }
    return NO;
}

iOS的基本手勢