iOS開發小功能之八：手勢的簡單使用(6種)以及代理方法

標籤：

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,且預設控制只支援一個手勢！！若想支援多個手勢，詳見下面的代理方法 11 //    [self setUpRotation]; 12 //    [self setUpPinch]; 13     [self setUpPan]; 14 } 15  16 #pragma mark - 點按手勢 17 - (void)setUpTap 18 { 19     //建立點按手勢 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     //設定點按手勢代理 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 - 撥動手勢 56 - (void)setUpSwipe 57 { 58     //預設撥動手勢往右劃螢幕 59     UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)]; 60     //向上劃 61     swipeUp.direction = UISwipeGestureRecognizerDirectionUp; 62     [_imageView addGestureRecognizer:swipeUp]; 63     //一個清掃手勢只支援一個方向，如果想支援多個方向，必須建立多個 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;后角度一直為0 87     self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotation.rotation);    88     //複位 89     rotation.rotation = 0; 90     //擷取手勢旋轉的角度 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 *)pinch103 {104     //放大的比例相對於原始點，注意：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），注意：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 //行動裝置檢視115 - (void)setUpPan116 {117     UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];118     [self.imageView addGestureRecognizer:pan];119 }120 - (void)pan:(UIPanGestureRecognizer *)pan121 {122     //擷取手勢的移動，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 是否允許同時支援多個手勢，預設只支援一個手勢，要調用此方法注意設定代理 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 *)touch15 {16     //擷取當前的觸摸點17     CGPoint currentP = [touch locationInView:self.imageView];18       在圖片的左半地區可以接受觸摸19     if (currentP.x < self.imageView.bounds.size.width * 0.5) {20         return YES;21     }else {22         return NO;23     }24 }

 

iOS開發小功能之八：手勢的簡單使用(6種)以及代理方法