iOS開發小功能之八：手勢的簡單使用(6種)以及代理方法

註意：全部都是在UIView上操作手勢

代碼：

  1 #import "ViewController.h"
  2 @interface ViewController () <UIGestureRecognizerDelegate>
  4 @property (weak, nonatomic) IBOutlet UIImageView *imageView;
  5 @end
  7 @implementation ViewController
  8 - (void)viewDidLoad {
  9     [super viewDidLoad];
 10     //只要是手勢，預設都是相對於原來位置,且預設控制只支持一個手勢！！若想支持多個手勢，詳見下麵的代理方法
 11 //    [self setUpRotation];
 12 //    [self setUpPinch];
 13     [self setUpPan];
 14 }
 15 
 16 #pragma mark - 點按手勢
 17 - (void)setUpTap
 18 {
 19     //創建點按手勢
 20     UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)];
 21     //需要連續點3次才能觸發
 22     //    tap.numberOfTapsRequired = 3;
 23     //往imageView上添加點按手勢
 24     [self.imageView addGestureRecognizer:tap];
 25     //設置點按手勢代理
 26     tap.delegate = self;
 27 }
 28 
 29 - (void)tap:(UITapGestureRecognizer *)tap
 30 {
 31     NSLog(@"%s",__func__);
 32 }
 33 
 34 #pragma mark - 長按手勢
 35 //預設觸發兩次（開始觸摸半秒後一次，結束觸摸一次）
 36 - (void)setUpLongPress
 37 {
 38     UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
 39     [self.imageView addGestureRecognizer:longPress];
 40     longPress.delegate = self;
 41 }
 42 
 43 - (void)longPress:(UILongPressGestureRecognizer *)longPress
 44 {
 45     開始的時候觸摸
 46     if (longPress.state == UIGestureRecognizerStateBegan) {
 47        NSLog(@"%s",__func__);
 48     }
 49     結束的時候觸摸
 50     if (longPress.state == UIGestureRecognizerStateEnded) {
 51         NSLog(@"%s",__func__);
 52     }
 53 }
 54 
 55 #pragma mark - 輕掃手勢
 56 - (void)setUpSwipe
 57 {
 58     //預設輕掃手勢往右劃屏幕
 59     UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
 60     //向上劃
 61     swipeUp.direction = UISwipeGestureRecognizerDirectionUp;
 62     [_imageView addGestureRecognizer:swipeUp];
 63     //一個清掃手勢只支持一個方向，如果想支持多個方向，必須創建多個
 64     UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
 65     //向下劃
 66     swipeDown.direction = UISwipeGestureRecognizerDirectionDown;
 67     [_imageView addGestureRecognizer:swipeDown];
 68 }
 69 - (void)swipe:(UISwipeGestureRecognizer *)swipe
 70 {
 71     NSLog(@"%s",__func__);
 72 }
 73 
 74 #pragma mark - 旋轉手勢
 75 //預設傳遞的角度都相對於最開始的位置
 76 - (void)setUpRotation
 77 {
 78     UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
 79     rotation.delegate = self;
 80     [self.imageView addGestureRecognizer:rotation];
 81 }
 82 - (void)rotation:(UIRotationGestureRecognizer *)rotation
 83 {
 84     //讓圖片隨著手勢旋轉而旋轉,旋轉的角度相當於初始位置的值,配合rotation.rotation = 0;無法轉動
 85 //    self.imageView.transform = CGAffineTransformMakeRotation(rotation.rotation);
 86     //手勢旋轉一下能讓圖片高速旋轉N圈，並且不受控制，方向不容易確定。配合rotation.rotation = 0;後角度一直為0
 87     self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotation.rotation);   
 88     //複位
 89     rotation.rotation = 0;
 90     //獲取手勢旋轉的角度
 91     NSLog(@"%f",rotation.rotation);
 92 }
 93 
 94 #pragma mark - 捏合手勢
 95 //兩根手指放大縮小圖片
 96 - (void)setUpPinch
 97 {
 98     UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
 99     pinch.delegate = self;
100     [self.imageView addGestureRecognizer:pinch];
101 }
102 - (void)pinch:(UIPinchGestureRecognizer *)pinch
103 {
104     //放大的比例相對於原始點，註意：這個不能配合pinch.scale = 1使用，否則不能放大
105 //    self.imageView.transform = CGAffineTransformMakeScale(pinch.scale, pinch.scale);
106     //隨著兩手指的距離增大，圖片會無規則的迅速的放大或者縮小（此處無法控制放大還是縮小），註意：配合pinch.scale = 1使用會正常的放大和縮小
107     self.imageView.transform = CGAffineTransformScale(self.imageView.transform, pinch.scale, pinch.scale);
108     //複位
109     pinch.scale = 1;
110     NSLog(@"%f",pinch.scale);
111 }
112 
113 #pragma mark - 拖拽
114 //移動視圖
115 - (void)setUpPan
116 {
117     UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
118     [self.imageView addGestureRecognizer:pan];
119 }
120 - (void)pan:(UIPanGestureRecognizer *)pan
121 {
122     //獲取手勢的移動，相對於原始點
123     CGPoint transP = [pan translationInView:self.imageView];
124     self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, transP.x, transP.y);
125     //複位
126     [pan setTranslation:CGPointZero inView:self.imageView];
127     NSLog(@"%@",NSStringFromCGPoint(transP));
128 }
129 @end

代理方法：

 1 是否允許同時支持多個手勢，預設只支持一個手勢，要調用此方法註意設置代理
 2 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
 3 {
 4     return YES;
 5 }
 6 
 7 是否允許開始觸發手勢
 8 - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
 9 {
10     return NO;
11 }
12 
13 是否允許接收手機的觸摸(可以控制觸摸的範圍)
14 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
15 {
16     //獲取當前的觸摸點
17     CGPoint currentP = [touch locationInView:self.imageView];
18       在圖片的左半區域可以接受觸摸
19     if (currentP.x < self.imageView.bounds.size.width * 0.5) {
20         return YES;
21     }else {
22         return NO;
23     }
24 }