iOS——常用的手勢總結

前言

我們在平時玩手機的時候都知道關于手勢的重要性，在加入手勢的應用時，使我們的App變得更加方便使用，那么具體iOS有幾種常用的手勢呢？下面我簡單的總結一下那些關于iOS最常用的手勢。關于手勢的應用iOS提供了UIGestureRecognizer類。手勢識別UIGestureRecognizer類是個抽象類，下面的子類是具體的手勢，開發這可以直接使用這些手勢識別：

使用手勢的步驟

使用手勢很簡單，分為兩步：

創建手勢實例。當創建手勢時，指定一個回調方法，當手勢開始，改變、或結束時，回調方法被調用。

添加到需要識別的View中。每個手勢只對應一個View，當屏幕觸摸在View的邊界內時，如果手勢和預定的一樣，那就會回調方法。

需要注意的是：一個手勢只能對應一個View，但是一個View可以有多個手勢。

UIPanGestureRecognizer （拖動手勢）

新建一個ImageView，然后添加手勢

UIImageView *panImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"pan.png"]]; panImageView.frame = CGRectMake(50, 50, 100, 160); UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)]; [panImageView addGestureRecognizer:panGestureRecognizer]; [self.view setBackgroundColor:[UIColor whiteColor]]; [self.view addSubview:panImageView];

它 的回調方法：

- (void) handlePan:(UIPanGestureRecognizer*) recognizer { CGPoint translation = [recognizer translationInView:self.view]; recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, recognizer.view.center.y + translation.y); [recognizer setTranslation:CGPointZero inView:self.view]; }

UIPinchGestureRecognizer(縮放手勢）

//創建手勢對象 UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pichGestureClick:)];//添加到視圖 [imageView addGestureRecognizer:pinch];

關聯方法:

- (void)pichClick:(UIPinchGestureRecognizer *)pinch {//縮放的系數NSLog(@"%.2lf", pinch.scale);//固定寫法pinch.view.transform = CGAffineTransformScale(pinch.view.transform, pinch.scale, pinch.scale);//重置縮放系數（否則系數會累加）pinch.scale = 1.0; }

UIRotationGestureRecognizer(旋轉手勢)

//創建手勢對象 UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationGestureClick:)];//添加到視圖 [imageView addGestureRecognizer:rotation];

關聯方法：

- (void)rotationClick:(UIRotationGestureRecognizer *)rotation {//rotation.rotation 手勢旋轉的角度rotation.view.transform = CGAffineTransformRotate(rotation.view.transform, rotation.rotation);//重置角度rotation.rotation = 0; }

UITapGestureRecognizer (點按手勢）

//創建手勢對象 UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick:)];//設置相關屬性 //點擊次數（默認1） tap.numberOfTapsRequired = 1; //手指的個數（默認1） tap.numberOfTouchesRequired = 1; //添加到視圖 [testView addGestureRecognizer:tap];

關聯方法：

- (void)tapClick:(UITapGestureRecognizer *)tap{NSLog(@"點按手勢響應！"); }

添加兩個ImagView并添加手勢

前面說過一個手勢只能對應一個View，但是一個View可以有多個手勢，那么如何將兩個View都設定同樣的手勢呢？

- (void)viewDidLoad { [super viewDidLoad]; UIImageView *image1ImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image1.png"]]; UIImageView *image2 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image2.png"]]; snakeImageView.frame = CGRectMake(120, 120, 100, 160); dragonImageView.frame = CGRectMake(50, 50, 100, 160); [self.view addSubview:image1ImageView]; [self.view addSubview:image2ImageView]; for (UIView *view in self.view.subviews) { UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)]; UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinch:)]; UIRotationGestureRecognizer *rotateRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(handleRotate:)]; [view addGestureRecognizer:panGestureRecognizer]; [view addGestureRecognizer:pinchGestureRecognizer]; [view addGestureRecognizer:rotateRecognizer]; [view setUserInteractionEnabled:YES]; } [self.view setBackgroundColor:[UIColor whiteColor]]; }

總結

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