iOS手勢操作總結
手勢操作種類
手勢操作的代理方法(UIGestureRecognizerDelegate)
手勢可能發生的條件，返回NO可以阻止此手勢的發生或者此手勢不產生任何效果
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer;
是否允許多個手勢同時發生
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;
UITapGestureRecognier敲擊，點擊手勢
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)]; // 設置代理 tap.delegate = self; // 設置點擊次數觸發手勢事件 tap.numberOfTapsRequired = 1; // 設置需要點擊的手指數 tap.numberOfTouchesRequired = 1; [self.image addGestureRecognizer:tap];
UILongPressGestureRecongnizer長按
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)]; // 代理 longPress.delegate = self; // 設置最小間隔時間, 手指按下與離開間隔時間 longPress.minimumPressDuration = 1.0; // 按下過程中允許移動的像素 longPress.allowableMovement = 30; [self.image addGestureRecognizer:longPress];
UIPinchGestureRecognizer縮放手勢
scale: 設置縮放比例，相對于原來大小
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)]; // 代理 pinch.delegate = self; // 設置縮放比例 pinch.scale = 1.2; [self.image addGestureRecognizer:pinch];
UIRotationGestureRecognizer旋轉手勢
rotation: 旋轉弧度，要保證每次都在上一次位置開始旋轉，而不是回歸初始位置，必須要在動作方法里將此值清零
- (void)setupRotation{ UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)]; // 設置代理 rotation.delegate = self; [self.image addGestureRecognizer:rotation];}- (void)rotation:(UIRotationGestureRecognizer *)rotation{ // 旋轉角度 CGFloat radian = rotation.rotation; self.image.transform = CGAffineTransformRotate(self.image.transform, radian); // 復位，保證每次都是在上一次位置開始轉，而不是每次都回歸初始位置再轉 rotation.rotation = 0;}UISwipeGestureRecognizer輕掃, 手指按下然后在屏幕上滑動
輕掃分四個方向（上下左右），并且如果要在一個控件上同時添加一個以上的輕掃動作，必須對每個動作添加一個對象。也就是說每個方向的動作對應一個對象。
direction: 指定輕掃動作的方向
typedef NS_OPTIONS(NSUInteger, UISwipeGestureRecognizerDirection) { UISwipeGestureRecognizerDirectionRight = 1 << 0, // 從左向右 UISwipeGestureRecognizerDirectionLeft = 1 << 1, // 從右向左 UISwipeGestureRecognizerDirectionUp = 1 << 2, // 從下往上 UISwipeGestureRecognizerDirectionDown = 1 << 3 // 從上往下};UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)]; // 設置代理 swipeUp.delegate = self; // 修改方向, 從下往上 swipeUp.direction = UISwipeGestureRecognizerDirectionUp; [self.image addGestureRecognizer:swipeUp]; // 添加其他方向手勢 UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)]; // 修改方向, 從下往上 swipeDown.direction = UISwipeGestureRecognizerDirectionDown; [self.image addGestureRecognizer:swipeDown];
UIPanGestureRecognizer拖拽，按下拖動控件操作
注意點：手勢的觸摸點locationInView和手勢的移動點translationInView是不一樣的，前者是用locationInView取得是指手指在當前控件中的坐標，后者表示相對于父view的rect
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)]; // 設置代理 pan.delegate = self; [self.image addGestureRecognizer:pan];
// 手勢的觸摸點 // CGPoint p = [pan locationInView:self.image]; // 手勢的移動點(每次移動的位移點) CGPoint transP = [pan translationInView:self.image]; NSLog(@"%f, %f", transP.x, transP.y); self.image.transform = CGAffineTransformTranslate(self.image.transform, transP.x, transP.y); // 復位 [pan setTranslation:CGPointZero inView:self.image];
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