手势
06/29/2017
内容目录：
- 在block中触发view的点击事件
- 利用pan手势，监听对view的上下左右滑动
- 各种手势的简单实现
- 解决手势冲突
一、在block中触发view的点击事件
首先创建一个UIView的分类，下面是头文件中的代码。
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/****************UIView+WHAddTap.h**********************/ #import <UIKit/UIKit.h> // 定义点击view的block typedef void(^TapActionBlock)(UITapGestureRecognizer *tapGesture); @interface UIView (WHAddTap) // 点击view时触发此方法 - (void)wh_addTapActionWithBlock:(TapActionBlock)block; @end |
下面是具体实现代码，需要用到runtime的关联对象，所以别忘了引入头文件#import <objc/runtime.h>
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/****************UIView+WHAddTap.m**********************/ #import "UIView+WHAddTap.h" #import <objc/runtime.h> @implementation UIView (WHAddTap) - (void)wh_addTapActionWithBlock:(TapActionBlock)block { // 关联对象获取手势tap，_cmd是key值，代表此方法名 UITapGestureRecognizer *tap = objc_getAssociatedObject(self, _cmd); if (!tap) { // 首次点击获取不到关联对象，创建手势并绑定触发方法 tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(actionForTap:)]; // 添加手势 [self addGestureRecognizer:tap]; // 运用runtime，set手势tap，这样下次点击的时候 外面的tap就存在了 objc_setAssociatedObject(self, @selector(wh_addTapActionWithBlock:), tap, OBJC_ASSOCIATION_RETAIN); } // key是手势触发的方法名，关联block objc_setAssociatedObject(self, @selector(actionForTap:), block, OBJC_ASSOCIATION_COPY); } // tap手势的实现 - (void)actionForTap:(UITapGestureRecognizer *)tap { if (tap.state == UIGestureRecognizerStateRecognized) { // _cmd就是此方法名，利用这个key拿到上面的方法关联的block TapActionBlock block = objc_getAssociatedObject(self, _cmd); if (block) { block(tap); } } } @end |
应用如下
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// 在需要使用的地方引入头文件 #import "UIView+WHAddTap.h" // 直接用view对象调用分类中的方法，在block中写代码 [view wh_addTapActionWithBlock:^(UITapGestureRecognizer *tapGesture) { NSLog(@"点击了这个view"); }]; |
二、利用pan手势，监听对view的上下左右滑动
简单暴力，直接上代码
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// 给view添加pan手势 UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(directionPan:)]; [view addGestureRecognizer:pan]; // 监听上下左右滑动的方法 - (void)directionPan:(UIPanGestureRecognizer *)pan { CGPoint movePoint = [pan translationInView:pan.view]; [pan setTranslation:CGPointZero inView:pan.view]; CGFloat absX = fabs(movePoint.x); CGFloat absY = fabs(movePoint.y); if (absX > absY ) { if (movePoint.x<0) { NSLog(@"向左滑动"); }else{ NSLog(@"向右滑动"); } } else if (absY > absX) { if (movePoint.y<0) { NSLog(@"向上滑动"); }else{ NSLog(@"向下滑动"); } } } |
三、各种手势的简单实现
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// 1. 缩放手势pinch UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)]; [view addGestureRecognizer:pinch]; // 缩放手势pinch触发方法 - (void)pinch:(UIPinchGestureRecognizer *)pinch { self.tempView.transform = CGAffineTransformScale(self.tempView.transform, pinch.scale, pinch.scale); pinch.scale = 1; } /************************************************************/ // 2. 点击手势tap UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)]; tap.numberOfTapsRequired = 1; // 点击多少次才能触发方法 tap.numberOfTouchesRequired = 1; // 几根手指点击 [view addGestureRecognizer:tap]; // 点击手势tap触发方法 - (void)tap:(UITapGestureRecognizer *)tap { NSLog(@"%@", tap.view); } /************************************************************/ // 3. 长按手势longPress UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)]; longPress.minimumPressDuration = 2; // 长按2秒触发监听方法 longPress.allowableMovement = 5; // 这个范围内移动, 还是可以触发方法 [view addGestureRecognizer:longPress]; // 长按手势longPress触发方法 - (void)longPress:(UILongPressGestureRecognizer *)longPress { if (longPress.state == UIGestureRecognizerStateBegan) { NSLog(@"在这里执行长按后的代码"); } } /************************************************************/ // 4. 轻扫手势swipe // 向左 UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)]; swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft; [view addGestureRecognizer:swipeLeft]; // 向右 UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)]; swipeRight.direction = UISwipeGestureRecognizerDirectionRight; [view addGestureRecognizer:swipeRight]; // 向上 UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)]; swipeUp.direction = UISwipeGestureRecognizerDirectionUp; [view addGestureRecognizer:swipeUp]; // 向上 UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)]; swipeDown.direction = UISwipeGestureRecognizerDirectionDown; [view addGestureRecognizer:swipeDown]; // 轻扫手势swipe触发方法 - (void)swipe:(UISwipeGestureRecognizer *)swipe { if (swipe.direction == UISwipeGestureRecognizerDirectionRight) { NSLog(@"向右Swipe"); } else if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) { NSLog(@"向左Swipe"); } else if (swipe.direction == UISwipeGestureRecognizerDirectionUp) { NSLog(@"向上Swipe"); } else if (swipe.direction == UISwipeGestureRecognizerDirectionDown) { NSLog(@"向下Swipe"); } } /************************************************************/ // 5. 移动手势pan UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)]; [view addGestureRecognizer:pan]; // 移动手势pan触发方法 - (void)pan:(UIPanGestureRecognizer *)pan { CGPoint movePoint = [pan translationInView:pan.view]; _tempView.transform = CGAffineTransformTranslate(_tempView.transform, movePoint.x, movePoint.y); [pan setTranslation:CGPointZero inView:pan.view]; } /************************************************************/ // 6. 旋转手势Rotation UIRotationGestureRecognizer *rotate = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)]; rotate.delegate = self; [view addGestureRecognizer:rotate]; // 旋转手势Rotation触发方法 - (void)rotate:(UIRotationGestureRecognizer *)rotate { _tempView.transform = CGAffineTransformRotate(_tempView.transform, rotate.rotation); rotate.rotation = 0; } |
四、解决手势冲突
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// 首先遵守UIGestureRecognizerDelegate @interface ViewController () <UIGestureRecognizerDelegate> // 实现如下方法，return YES 解决手势冲突问题 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer { return YES; } |