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[操作系统]iOS阶段学习第35天笔记(Touch手势介绍)


一、Touch手势

1、利用手势实现UIButton移动效果  实例代码
     
1) 创建一个继承自UIButton的类 MyButton.h  代码实现 

1 #import <UIKit/UIKit.h>2 @interface MyButton : UIButton3 @end

2)MyButton.m  的代码实现

 1 #import "MyButton.h" 2 @implementation MyButton 3 { 4   CGPoint _lastPoint; 5 } 6  7 //手势开始 8 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 9 {10   UITouch *touch = [touches anyObject];11   CGPoint point = [touch locationInView:self];12   NSLog(@"began:%@",NSStringFromCGPoint(point));13   _lastPoint = point;14 }15 16 -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event17 {18   UITouch *touch = [touches anyObject];19   CGPoint point = [touch locationInView:self]; 20   CGFloat offsetx = point.x - _lastPoint.x;21   CGFloat offsety = point.y - _lastPoint.y; 22   self.center = CGPointMake(self.center.x + offsetx, self.center.y + offsety);  23   NSLog(@"moved:%@",NSStringFromCGPoint(point));24 }25 26 -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event27 {28   UITouch *touch = [touches anyObject];29   CGPoint point = [touch locationInView:self];30   NSLog(@"end:%@",NSStringFromCGPoint(point));31 }32 @end 

3)父视图中的代码实现

 1 #import "ViewController.h" 2 #import "MyButton.h" 3 @interface ViewController () 4 { 5   MyButton *_v; 6   CGPoint _lastPoint; 7 } 8 @end 9 10 @implementation ViewController11 12 - (void)viewDidLoad {13   [super viewDidLoad];14   _v = [[MyButton alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];15 _v.backgroundColor = [UIColor redColor];16   [self.view addSubview:_v];17 }18 19 //手势开始20 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event21 {22   UITouch *touch = [touches anyObject];23   CGPoint point = [touch locationInView:self.view];24   NSLog(@"began:%@",NSStringFromCGPoint(point));25   _lastPoint = point;26 }27 28 -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event29 {30   UITouch *touch = [touches anyObject];31   CGPoint point = [touch locationInView:self.view];32   CGFloat offsetx = point.x - _lastPoint.x;33   CGFloat offsety = point.y - _lastPoint.y; 34   _v.center = CGPointMake(_v.center.x + offsetx, _v.center.y + offsety);   35   _lastPoint = point;   36   NSLog(@"moved:%@",NSStringFromCGPoint(point));37 }38 39 -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event40 {41   UITouch *touch = [touches anyObject];42   CGPoint point = [touch locationInView:self.view];43   NSLog(@"end:%@",NSStringFromCGPoint(point));44 }45 46 -(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event47 {48   49 }50 @end

2、利用Touch手势实现控件的缩放与旋转效果 实例代码

 1 #import "ViewController.h" 2 //遵守旋转与缩放的代理协议 3 @interface ViewController ()<UIGestureRecognizerDelegate> 4 @end 5  6 @implementation ViewController 7  8 - (void)viewDidLoad { 9   [super viewDidLoad];10   11   UIImageView *imgv = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];12   imgv.center = self.view.center;13   [self.view addSubview:imgv];14   imgv.image = [UIImage imageNamed:@"3"];15   imgv.userInteractionEnabled = YES;16   17   //点击手势18   UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapGes:)];19   20   //设置该手势需要的手指数21   tap.numberOfTouchesRequired = 2;22   23   //设置该手势的点击次数24   tap.numberOfTapsRequired = 4;25   [imgv addGestureRecognizer:tap];26   27   //平移手势,拖拽手势28   UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panGes:)];29   [imgv addGestureRecognizer:pan];30   31   //缩放手势32   UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchGes:)];33   [imgv addGestureRecognizer:pinch];34   pinch.delegate = self;35   36   //旋转37   UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationGes:)];38   [imgv addGestureRecognizer:rotation];39   rotation.delegate = self;40 }41 42 //返回值表示能否同时识别其他(相对于已经设置了代理的手势)手势43 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:
(UIGestureRecognizer *)otherGestureRecognizer44 {45 return YES;46 }47 -(void)rotationGes:(UIRotationGestureRecognizer *)rotation48 {49 rotation.view.transform = CGAffineTransformRotate(rotation.view.transform, rotation.rotation);50 rotation.rotation = 0.0;51 }52 -(void)pinchGes:(UIPinchGestureRecognizer *)pinch53 {54 //transform:仿射变换55 //pinch.scale,是缩放手势的捏合倍率56 pinch.view.transform = CGAffineTransformScale(pinch.view.transform, pinch.scale, pinch.scale);57 58 //倍率还原59 pinch.scale = 1.0;60 }61 -(void)panGes:(UIPanGestureRecognizer *)pan62 {63 //返回当前的手势的偏移量64 CGPoint offset = [pan translationInView:pan.view];65 //pan.view就是pan手势所加到的视图66 pan.view.center = CGPointMake(pan.view.center.x + offset.x, pan.view.center.y + offset.y);67 //移动以后,把偏移量归068 [pan setTranslation:CGPointZero inView:pan.view];69 }70 71 -(void)tapGes:(UIGestureRecognizer *)tap72 {73 NSLog(@"==========");74 }75 @end