[iOSUI進階-3.2]手勢識別器UIGestureRecognizer

2019-11-14 19:39:15

字體：大中小

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A.系統提供的手勢識別器

1.敲擊手勢 UITapGestureRecognizer

numberOfTapsRequired：敲擊次數

numberOfTouchesRequired：同時敲擊觸碰數（手指數）

 1 - (void) testTap { 2     // 創建手勢識別器 3     UITapGestureRecognizer *taPRec = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapRun:)]; 4     tapRec.numberOfTapsRequired = 3; // 觸發需要點擊的次數 5     tapRec.numberOfTouchesRequired = 2; // 觸發需要同時點擊的點數目 6     7     // 配置手勢識別器到控件 8     [self.hvwView addGestureRecognizer: tapRec]; 9 }10 11 /** tap手勢的事件處理方法 */12 - (void) tapRun:(UITapGestureRecognizer *) tapRec {13     NSLog(@"tapRun");14 }

2.長按手勢 UILongPressGestureRecognizer

minimumPressDuration: 長按生效時間

numberOfTouchesRequired: 需要的同時點擊數

numberOfTapsRequired: 需要的點擊次數

allowableMovement: 長按有效移動范圍（從點擊開始，長按移動的允許范圍）

ps：移動的時候會不斷調用目標方法

1 - (void) testLongPress {2     UILongPressGestureRecognizer *longRec = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressRun:)];3    4     longRec.minimumPressDuration = 2; // 長按生效時間5     longRec.allowableMovement = 50; // 長按允許移動范圍,單位：px6    7     [self.hvwView addGestureRecognizer:longRec];8 }

3.輕掃手勢 UISwipeGestureRecognizer

direction：掃的方向上下左右

1 typedef enum {2    UISwipeGestureRecognizerDirectionRight = 1 << 0,3    UISwipeGestureRecognizerDirectionLeft  = 1 << 1,4    UISwipeGestureRecognizerDirectionUp    = 1 << 2,5    UISwipeGestureRecognizerDirectionDown  = 1 << 36 } UISwipeGestureRecognizerDirection;

1 - (void) testSwipe {2     UISwipeGestureRecognizer *swipeRec = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRun:)];3     swipeRec.direction = UISwipeGestureRecognizerDirectionRight; // 輕掃的方向4    5     [self.hvwView addGestureRecognizer:swipeRec];6 }

4.捏合手勢 UIPinchGestureRecognizer

scale: 捏合的距離

 1 - (void) testPinch { 2     UIPinchGestureRecognizer *rec = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchRun:)]; 3     4     [self.hvwView addGestureRecognizer:rec]; 5 } 6  7 - (void) pinchRun:(UIPinchGestureRecognizer *) rec { 8     rec.view.transform = CGAffineTransformScale(rec.view.transform, rec.scale, rec.scale); 9    10     // 一定要復位！?。〔蝗话醋∧蠛蠒粩喁B加倍數11     rec.scale = 1;12 }

5.旋轉手勢 UIRotationGestureRecognizer

rotation: 旋轉了的角度

 1 - (void) testRotation { 2     UIRotationGestureRecognizer *rotationRec = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationRun:)]; 3     4     [self.hvwView addGestureRecognizer:rotationRec]; 5 } 6  7 - (void) rotationRun:(UIRotationGestureRecognizer *) rec { 8     rec.view.transform = CGAffineTransformRotate(rec.view.transform, rec.rotation); 9    10     // 一定要復位！??！不然會在按住旋轉的時候會不斷疊加rotation11     rec.rotation = 0;12 }

6.拖曳手勢 UIPanGestureRecognizer

相對始點拖曳距離：[pan translationInView:pan.view]

 1 - (void) testPan { 2     UIPanGestureRecognizer *rec = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panRun:)]; 3     4     [self.hvwView addGestureRecognizer:rec]; 5 } 6  7 - (void) panRun:(UIPanGestureRecognizer *) rec { 8     // 取得拖曳距離 9     CGPoint movedDistance = [rec translationInView:rec.view];10     CGPoint viewCenter = rec.view.center;11     viewCenter.x += movedDistance.x;12     viewCenter.y += movedDistance.y;13     rec.view.center = viewCenter;14    15     // 復位拖曳距離16     [rec setTranslation:CGPointZero inView:rec.view];17 }

B.一般情況只能使用一個識別器，使用代理設置才能同時使用多個識別器

1.遵守協議：

1 @interface ViewController () <UIGestureRecognizerDelegate>

2.給需要同時進行識別的手勢識別器設置代理

1 rec.delegate = self;

3.實現手勢識別器同時使用方法

1 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {2    3     // 任何兩種手勢識別器都能同時使用4     return YES;5 }

  1 //  2 //  ViewController.m  3 //  GestureRecognizerTest  4 //  5 //  Created by hellovoidworld on 15/1/13.  6 //  Copyright (c) 2015年 hellovoidworld. All rights reserved.  7 //  8   9 #import "ViewController.h" 10  11 @interface ViewController () <UIGestureRecognizerDelegate> 12  13 @property (weak, nonatomic) IBOutlet UIView *hvwView; 14  15 @end 16  17 @implementation ViewController 18  19 - (void)viewDidLoad { 20     [super viewDidLoad]; 21     // Do any additional setup after loading the view, typically from a nib. 22     23 //    [self testTap]; 24 //    [self testLongPress]; 25 //    [self testSwipe]; 26     [self testRotation]; 27     [self testPinch]; 28     [self testPan]; 29 } 30  31 - (void) testTap { 32     // 創建手勢識別器 33     UITapGestureRecognizer *tapRec = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapRun:)]; 34     tapRec.numberOfTapsRequired = 3; // 觸發需要點擊的次數 35     tapRec.numberOfTouchesRequired = 2; // 觸發需要同時點擊的點數目 36     37     // 配置手勢識別器到控件 38     [self.hvwView addGestureRecognizer: tapRec]; 39 } 40  41 /** tap手勢的事件處理方法 */ 42 - (void) tapRun:(UITapGestureRecognizer *) tapRec { 43     NSLog(@"tapRun"); 44 } 45  46 - (void) testLongPress { 47     UILongPressGestureRecognizer *longRec = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressRun:)]; 48     49     longRec.minimumPressDuration = 2; // 長按生效時間 50     longRec.allowableMovement = 50; // 長按允許移動范圍,單位：px 51     52     [self.hvwView addGestureRecognizer:longRec]; 53 } 54  55 - (void) longPressRun:(UILongPressGestureRecognizer *) rec { 56     NSLog(@"longPress"); 57 } 58  59 - (void) testSwipe { 60     UISwipeGestureRecognizer *swipeRec = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRun:)]; 61     swipeRec.direction = UISwipeGestureRecognizerDirectionRight; // 輕掃的方向 62     63     [self.hvwView addGestureRecognizer:swipeRec]; 64 } 65  66 - (void) swipeRun:(UISwipeGestureRecognizer *) rec { 67     NSLog(@"swipe"); 68 } 69  70 - (void) testRotation { 71     UIRotationGestureRecognizer *rotationRec = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationRun:)]; 72     rotationRec.delegate = self; 73     74     [self.hvwView addGestureRecognizer:rotationRec]; 75 } 76  77 - (void) rotationRun:(UIRotationGestureRecognizer *) rec { 78     rec.view.transform = CGAffineTransformRotate(self.hvwView.transform, rec.rotation); 79     80     // 一定要復位?。?！不然會在按住旋轉的時候會不斷疊加rotation 81     rec.rotation = 0; 82 } 83  84 - (void) testPinch { 85     UIPinchGestureRecognizer *rec = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchRun:)]; 86     rec.delegate = self; 87     88     [self.hvwView addGestureRecognizer:rec]; 89 } 90  91 - (void) pinchRun:(UIPinchGestureRecognizer *) rec { 92     rec.view.transform = CGAffineTransformScale(rec.view.transform, rec.scale, rec.scale); 93     94     // 一定要復位?。。〔蝗话醋∧蠛蠒粩喁B加倍數 95     rec.scale = 1; 96 } 97  98 - (void) testPan { 99     UIPanGestureRecognizer *rec = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panRun:)];100     rec.delegate = self;101    102     [self.hvwView addGestureRecognizer:rec];103 }104 105 - (void) panRun:(UIPanGestureRecognizer *) rec {106     // 取得拖曳距離107     CGPoint movedDistance = [rec translationInView:rec.view];108     CGPoint viewCenter = rec.view.center;109     viewCenter.x += movedDistance.x;110     viewCenter.y += movedDistance.y;111     rec.view.center = viewCenter;112    113     // 復位拖曳距離114     [rec setTranslation:CGPointZero inView:rec.view];115 }116 117 - (void)didReceiveMemoryWarning {118     [super didReceiveMemoryWarning];119     // Dispose of any resources that can be recreated.120 }121 122 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {123    124     // 任何兩種手勢識別器都能同時使用125     return YES;126 }127 128 @end