Objective c 获取UIGestureRecognitor的UITouch对象

有没有办法获取与手势关联的

UITouch

对象

UIGestureRecognizer

似乎没有任何方法可用于此操作。

如果您正在编写自己的UIGestureRecognizer，则可以让触摸对象覆盖：

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

或相应的移动、结束或取消

---

有很多关于子类化的信息

Jay的权利。。。您将需要一个子类。试试这个大小，它来自我的一个项目。在Draggesturererecognizer.h中：

@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

当然，您需要实现

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

方法，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];

}

---

如果只需要找出手势的位置，可以在UIGestureRecognitor对象上调用locationInView:或locationOfTouch:inView:。但是，如果要执行其他操作，则需要对其进行子类化。

如果它只是您感兴趣的位置，则不必对其进行子类化，UIGestureRecognitor会通知您tap的位置更改

使用目标初始化：

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

处理UIgestureRecognitzerStateChanged以获取位置更改：

- (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;
    }
}

---

下面是一种将长按添加到任意UIView的方法

这使您可以在任意数量的UIView上运行longpress。 在本例中，我通过标记限制对UIView方法的访问，但您也可以使用isKindOfClass

（根据我发现的情况，您必须使用TouchsMoved for LongPress，因为TouchsMoved在LongPress激活之前就开始启动了）

亚类-.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

viewcontroller-.h

                           //nothing special here

viewcontroller-.m

            #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
                    }
            }

简单快捷：

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

---

其中识别器是您的

uigestureerecognizer

别忘了添加#导入到Draggesturererecognizer.h文件IOS 8[valueForUndefinedKey:]：此类不符合按键触摸的键值编码。'，它只为特定视图的局部帧获取一个

CGPoint

，而locationOfTouch:inView:也分别为您提供每个触摸的位置。

            #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
                    }
            }

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