Ios 结合向下滑动和长按

我试图在我的ViewController（它有一个tableView）中实现两个手势识别器，它们必须一个接一个地工作。第一个是向下滑动手势，第二个是长按手势

这是我用@sergio建议修改的代码

    - (void)viewDidLoad
    {
        [super viewDidLoad];

        swipeDown = [[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeDownAction)] autorelease];

        longPress = [[[CustomLongPress alloc]initWithTarget:self action:@selector(longPressAction)] autorelease];


        longPress.minimumPressDuration = 2;

        swipeDown.numberOfTouchesRequired = 1;

        swipeDown.direction = UISwipeGestureRecognizerDirectionDown;


       swipeDown.delegate = self ;

        longPress.delegate = self ;

        [myTableView addGestureRecognizer:swipeDown];

        [myTableView addGestureRecognizer:longPress];





  }


    -(void)swipeDownAction {

        _methodHasBeenCalled = YES;    // bool @property declared in .h

        NSLog(@"Swipe down detected");


    }



    -(void)longPressAction {

        NSLog(@"long press detected");
    }

    - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
    {
        return YES;
    }

以及我的UILongPressGestureRecognitor子类：

#import "CustomLongPress.h"
#import "ViewController.h"


@interface CustomLongPress()
{

    ViewController *vc;
}

@end


@implementation CustomLongPress
-(id)initWithTarget:(id)target action:(SEL)action controller:(ViewController *)viewCon
{
    self = [super initWithTarget:target action:action];

    if (self) {

        vc = viewCon;

    }

    return self;
}


-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
     NSLog(vc.methodHasBeenCalled ? @"Yes" : @"No");

    if (vc.methodHasBeenCalled) {

        [super touchesBegan:touches withEvent:event];
    }
}

---

不幸的是，我仍然只能从swipeDown获得日志，但在长按时没有日志。如果我没有弄错的话，一旦系统检测到特定类型的手势（轻触、滑动、平移、长按等），它就不能再为该触摸动作发送不同类型的手势

这并不妨碍你达到你想要的结果。可能通过组合重载以下

UIResponder

方法：

– touchesBegan:withEvent:
– touchesMoved:withEvent:
– touchesEnded:withEvent:
– touchesCancelled:withEvent:

---

使用手势识别器（不确定输入是否会被一方使用而被另一方忽略），您可以确定这是一个“长刷”，您需要创建自己的自定义手势识别器。最好的方法是将

ui长按手势识别器子类化，使其仅在刷卡结束后“接受”长按。例如，在
触摸开始
方法中

- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
   <if swipe recognizer action method has been called>
       [super touchesBegan:touches withEvent:event];
   }
}

其中
x>y
表示
x
需要
y
才能失败。因此，您的
C
（长按手势识别器）需要
B
GR失败，而
B
需要
A
（您的刷卡识别器）失败<只要
A
识别出刷卡，code>B

就会失败；一旦

B

失败，将允许

C

识别长按（如果有）

编辑：

阅读您的评论后，您是否介意尝试一下，看看它是否有帮助：

删除覆盖的

触摸开始

并替换为：

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

然后定义：

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

  if (vc.methodHasBeenCalled) {
    [super touchesBegan:touches withEvent:event];
  } else {
     return;
  }
}

如果这不起作用，则使自定义手势识别器从通用手势识别器继承，然后

将

触摸开始：

留在原位，并将

触摸移动后的
替换为：

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

  self.lastTouch = [touches anyObject];
  if (vc.methodHasBeenCalled && self.gestureNotBegunYet == YES) {
    self.gestureNotBegunYet = NO;
    [self performSelector:@selector(recognizeLongPress) withObject:nil afterDelay:1.0];

  } else {
     return;
  }
}

并加上：

- (float)travelledDistance {
  CGPoint currentLocation = [self.lastTouch locationInView:self.view.superview];
  return sqrt(pow((currentLocation.x - self.initialLocation.x), 2.0) +
            pow((currentLocation.y - self.initialLocation.y), 2.0));
}

- (void)fail {
  self.gestureNotBegunYet = YES;
  [NSObject cancelPreviousPerformRequestsWithTarget:self];

}

- (void)recognizeLongPress {

  if ([self travelledDistance] < kTapDragThreshold) {
    self.longPressed = YES;
    self.state = UIGestureRecognizerStateChanged;
  } else {
        [self fail];
        self.state = UIGestureRecognizerStateFailed;
  }
}

- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {
  [self fail];
  [super touchesEnded:touches withEvent:event];
}

- (void)touchesCancelled:(NSSet*)touches withEvent:(UIEvent*)event {
  [self fail];
  [super touchesCancelled:touches withEvent:event];
}

---

我要试试这个，非常感谢！另外，请检查我的编辑以获得另一种方法，如果您愿意，这种方法更为人为，但不需要子类化。

@interface CustomLongPress（）

正确吗？你忽略了基类。。。您是否获得了触摸开始跟踪？是的，触摸开始的日志正在显示，并且

@interface CustomLongPress

正确。那么，当您进入触摸开始时，调用了什么

vc.methods

？是否将其值添加到NSLog跟踪？

- (float)travelledDistance {
  CGPoint currentLocation = [self.lastTouch locationInView:self.view.superview];
  return sqrt(pow((currentLocation.x - self.initialLocation.x), 2.0) +
            pow((currentLocation.y - self.initialLocation.y), 2.0));
}

- (void)fail {
  self.gestureNotBegunYet = YES;
  [NSObject cancelPreviousPerformRequestsWithTarget:self];

}

- (void)recognizeLongPress {

  if ([self travelledDistance] < kTapDragThreshold) {
    self.longPressed = YES;
    self.state = UIGestureRecognizerStateChanged;
  } else {
        [self fail];
        self.state = UIGestureRecognizerStateFailed;
  }
}

- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {
  [self fail];
  [super touchesEnded:touches withEvent:event];
}

- (void)touchesCancelled:(NSSet*)touches withEvent:(UIEvent*)event {
  [self fail];
  [super touchesCancelled:touches withEvent:event];
}

@property(nonatomic) CGPoint initialLocation;
@property(nonatomic, retain) UITouch* lastTouch;
@property(nonatomic) BOOL gestureNotBegunYet;