获取UITestureRecognizer的UITouch对象

Question

有没有办法让UITouch对象与手势关联？ UIGestureRecognizer似乎没有任何方法。

Answer 1

取消

的Apple docs有大量的信息

杰伊的权利...你会想要一个子类。试试这个大小，它来自我的一个项目。在DragGestureRecognizer.h：

@interface DragGestureRecognizer : UILongPressGestureRecognizer { 

} 

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event; 

@end 

@protocol DragGestureRecognizerDelegate <UIGestureRecognizerDelegate> 
- (void) gestureRecognizer:(UIGestureRecognizer *)gr movedWithTouches:(NSSet*)touches andEvent:(UIEvent *)event; 
@end 

而且在DragGestureRecognizer.m：

#import "DragGestureRecognizer.h" 


@implementation DragGestureRecognizer 

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { 

    [super touchesMoved:touches withEvent:event]; 

    if ([self.delegate respondsToSelector:@selector(gestureRecognizer:movedWithTouches:andEvent:)]) { 
     [(id)self.delegate gestureRecognizer:self movedWithTouches:touches andEvent:event]; 
    } 

} 

@end 

当然，你需要实现

- (void) gestureRecognizer:(UIGestureRecognizer *)gr movedWithTouches:(NSSet*)touches andEvent:(UIEvent *)event; 

方法在委托 - 例如：

DragGestureRecognizer * gr = [[DragGestureRecognizer alloc] initWithTarget:self action:@selector(pressed:)]; 
gr.minimumPressDuration = 0.15; 
gr.delegate = self; 
[self.view addGestureRecognizer:gr]; 
[gr release]; 



- (void) gestureRecognizer:(UIGestureRecognizer *)gr movedWithTouches:(NSSet*)touches andEvent:(UIEvent *)event{ 

    UITouch * touch = [touches anyObject]; 
    self.mTouchPoint = [touch locationInView:self.view]; 
    self.mFingerCount = [touches count]; 

} 

Answer 2

如果你正在写自己的UIGestureRecognizer你可以触摸的物体覆盖：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 

或等效的移动，结束或继承

Answer 3

如果您只需要查找手势的位置，则可以调用UIGestureRecognizer对象上的locationInView：或locationOfTouch：inView：。但是如果你想做其他事情，那么你需要继承子类。

Answer 4

如果它只是您感兴趣的位置，您不需要继承子类，就会收到来自UIGestureRecognizer的位置更改通知。

初始化目标：

self.longPressGestureRecognizer = [[[UILongPressGestureRecognizer alloc] initWithTarget: self action: @selector(handleGesture:)] autorelease]; 
[self.tableView addGestureRecognizer: longPressGestureRecognizer]; 

手柄UIGestureRecognizerStateChanged获得位置的变化：

- (void)handleGesture: (UIGestureRecognizer *)theGestureRecognizer { 
    switch (theGestureRecognizer.state) { 
     case UIGestureRecognizerStateBegan: 
     case UIGestureRecognizerStateChanged: 
     { 
      CGPoint location = [theGestureRecognizer locationInView: self.tableView]; 

      [self infoForLocation: location]; 

      break; 
     } 

     case UIGestureRecognizerStateEnded: 
     { 
      NSLog(@"Ended"); 

      break; 
     } 

     default: 
      break; 
    } 
} 

Answer 5

这里得到一个长按添加到任意的UIView的方法。

这可让您在任意数量的UIView上运行longpress。 在这个例子中，我通过标签限制对UIView方法的访问，但也可以使用isKindOfClass。

（从我发现你必须使用touchesMoved为长按，因为火灾的touchesBegan长按该变活动前）

子类 - .H

  #import <UIKit/UIKit.h> 
      #import <UIKit/UIGestureRecognizerSubclass.h> 

      @interface MyLongPressGestureRecognizer : UILongPressGestureRecognizer 

      - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event; 

      @property (nonatomic) CGPoint touchPoint; 
      @property (strong, nonatomic) UIView* touchView; 

      @end 

子类 - 的.m

  #import "MyLongPress.h" 

      @implementation MyLongPressGestureRecognizer 

      - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event; 
      { 
       UITouch * touch = [touches anyObject]; 
       self.touchPoint = [touch locationInView:self.view]; 
       self.touchView = [self.view hitTest:[touch locationInView:self.view] withEvent:event]; 
      } 

      #pragma mark - Setters 

      -(void) setTouchPoint:(CGPoint)touchPoint 
      { 
       _touchPoint =touchPoint; 
      } 

      -(void) setTouchView:(UIView*)touchView 
      { 
       _touchView=touchView; 
      } 
      @end 

viewcontroller - .h

      //nothing special here 

viewcontroller - 。米

  #import "ViewController.h" 
      //LOAD 
      #import "MyLongPress.h" 

      @interface ViewController() 

      //lOAD 
      @property (strong, nonatomic) MyLongPressGestureRecognizer* longPressGesture; 

      @end 

      @implementation PDViewController 

      - (void)viewDidLoad 
      { 
       [super viewDidLoad]; 

       //LOAD 
       self.longPressGesture =[[MyLongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressHandler:)]; 
       self.longPressGesture.minimumPressDuration = 1.2; 
       [[self view] addGestureRecognizer:self.longPressGesture]; 
      }    

      //LOAD 
      -(void) setLongPressGesture:(MyLongPressGestureRecognizer *)longPressGesture { 
       _longPressGesture = longPressGesture; 
      } 

      - (void)longPressHandler:(MyLongPressGestureRecognizer *)recognizer { 
        if (self.longPressGesture.touchView.tag >= 100) /* arbitrary method for limiting tap */ 
        { 
         //code goes here 
        } 
      } 

Answer 6

简单快捷：

NSArray *touches = [recognizer valueForKey:@"touches"]; 

识别在哪里你UIGestureRecognizer