iOS手势操作总结
手势操作种类
手势操作的代理方法(UIGestureRecognizerDelegate)
手势可能发生的条件，返回NO可以阻止此手势的发生或者此手势不产生任何效果
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer;
是否允许多个手势同时发生
- (BOOL)gestureRecognizer:(UIGestureRecognizer *) gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer: (UIGestureRecognizer *)otherGestureRecognizer;
UITapGestureRecognier敲击，点击手势
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)]; // 设置代理 tap.delegate = self; // 设置点击次数触发手势事件 tap.numberOfTapsRequired = 1; // 设置需要点击的手指数 tap.numberOfTouchesRequired = 1; [self.image addGestureRecognizer:tap];
UILongPressGestureRecongnizer长按
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)]; // 代理 longPress.delegate = self; // 设置最小间隔时间, 手指按下与离开间隔时间 longPress.minimumPressDuration = 1.0; // 按下过程中允许移动的像素 longPress.allowableMovement = 30; [self.image addGestureRecognizer:longPress];
UIPinchGestureRecognizer缩放手势
scale: 设置缩放比例，相对于原来大小
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)]; // 代理 pinch.delegate = self; // 设置缩放比例 pinch.scale = 1.2; [self.image addGestureRecognizer:pinch];
UIRotationGestureRecognizer旋转手势
rotation: 旋转弧度，要保证每次都在上一次位置开始旋转，而不是回归初始位置，必须要在动作方法里将此值清零
- (void)setupRotation
{
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
// 设置代理
rotation.delegate = self;
[self.image addGestureRecognizer:rotation];
}
- (void)rotation:(UIRotationGestureRecognizer *)rotation
{
// 旋转角度
CGFloat radian = rotation.rotation;
self.image.transform = CGAffineTransformRotate(self.image.transform, radian);
// 复位，保证每次都是在上一次位置开始转，而不是每次都回归初始位置再转
rotation.rotation = 0;
}
UISwipeGestureRecognizer轻扫, 手指按下然后在屏幕上滑动
轻扫分四个方向（上下左右），并且如果要在一个控件上同时添加一个以上的轻扫动作，必须对每个动作添加一个对象。也就是说每个方向的动作对应一个对象。
direction: 指定轻扫动作的方向
typedef NS_OPTIONS(NSUInteger, UISwipeGestureRecognizerDirection) {
UISwipeGestureRecognizerDirectionRight = 1 << 0, // 从左向右
UISwipeGestureRecognizerDirectionLeft = 1 << 1, // 从右向左
UISwipeGestureRecognizerDirectionUp = 1 << 2, // 从下往上
UISwipeGestureRecognizerDirectionDown = 1 << 3 // 从上往下
};
UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)]; // 设置代理 swipeUp.delegate = self; // 修改方向, 从下往上 swipeUp.direction = UISwipeGestureRecognizerDirectionUp; [self.image addGestureRecognizer:swipeUp]; // 添加其他方向手势 UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)]; // 修改方向, 从下往上 swipeDown.direction = UISwipeGestureRecognizerDirectionDown; [self.image addGestureRecognizer:swipeDown];
UIPanGestureRecognizer拖拽，按下拖动控件操作
注意点：手势的触摸点locationInView和手势的移动点translationInView是不一样的，前者是用locationInView取得是指手指在当前控件中的坐标，后者表示相对于父view的rect
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)]; // 设置代理 pan.delegate = self; [self.image addGestureRecognizer:pan];
// 手势的触摸点 // CGPoint p = [pan locationInView:self.image]; // 手势的移动点(每次移动的位移点) CGPoint transP = [pan translationInView:self.image]; NSLog(@"%f, %f", transP.x, transP.y); self.image.transform = CGAffineTransformTranslate(self.image.transform, transP.x, transP.y); // 复位 [pan setTranslation:CGPointZero inView:self.image];
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