ios - 设置 UIPanGesture 识别期间要查看的框架

Question

我正在尝试在 UIPanGesture 识别 UIView(中心灰色)期间更新两个标签的框架。

功能

我需要在英语和阿拉伯语之间选择一种语言。中间有一个 slider 按钮(灰色 View )，我已对其应用了 UIPanGesture。因此，当向阿拉伯语滑动时，语言英语应该移动到中心并假设它被选中，反之亦然。

我尽了最大努力，但只能弥补这一点。框架设置不正确，我不知道是否有其他简单的方法可以做到这一点。

代码

- (void)viewDidLoad {
    [super viewDidLoad];
    UIPanGestureRecognizer *gesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)];
    [dragview addGestureRecognizer:gesture];
}


- (void)handleGesture:(UIPanGestureRecognizer *)gestureRecognizer
{
    CGPoint velocity = [gestureRecognizer velocityInView: gestureRecognizer.view];
    CGPoint location = [gestureRecognizer locationInView: gestureRecognizer.view];

    if(velocity.x > 0)
    {
        NSLog(@"gesture went right");
        if (dragview.frame.origin.x + dragview.frame.size.width >= dragV.frame.size.width) {
            [dragview setFrame:CGRectMake(dragV.frame.size.width - dragview.frame.size.width, dragview.frame.origin.y, dragview.frame.size.width, dragview.frame.size.height)];
            english.center = CGPointMake(dragV.frame.size.width  / 2,
                                                              dragV.frame.size.height / 2);
        } else {
            float dX = location.x-panCoord.x;
            gestureRecognizer.view.frame = CGRectMake(gestureRecognizer.view.frame.origin.x+dX, 0, gestureRecognizer.view.frame.size.width, gestureRecognizer.view.frame.size.height);
            [english setFrame:CGRectMake(english.frame.origin.x + 1.0f, english.frame.origin.y, english.frame.size.width, english.frame.size.height)];
            [arabic setFrame:CGRectMake(arabic.frame.origin.x + 1.0f, arabic.frame.origin.y, arabic.frame.size.width, arabic.frame.size.height)];
        }
    }
    else
    {
        NSLog(@"gesture went left");
        if (dragview.frame.origin.x <= 0) {
            [dragview setFrame:CGRectMake(0, dragview.frame.origin.y, dragview.frame.size.width, dragview.frame.size.height)];
            arabic.center = CGPointMake(dragV.frame.size.width  / 2,
                                         dragV.frame.size.height / 2);
        } else {
            float dX = location.x+panCoord.x;
            gestureRecognizer.view.frame = CGRectMake(gestureRecognizer.view.frame.origin.x+dX, 0, gestureRecognizer.view.frame.size.width, gestureRecognizer.view.frame.size.height);
            [english setFrame:CGRectMake(english.frame.origin.x - 1.0f, english.frame.origin.y, english.frame.size.width, english.frame.size.height)];
            [arabic setFrame:CGRectMake(arabic.frame.origin.x - 1.0f, arabic.frame.origin.y, arabic.frame.size.width, arabic.frame.size.height)];
        }
    }
}

截图

最初看起来是这样的，

在向阿拉伯语拖动时，

在拖向英语的同时，

不胜感激!!

Answer 1

我得到了输出。我尝试了您的代码并使用了 SwipeGestureRecognizer 代码。它现在工作正常。

我尝试了 2 个选项

选项 1:SwipeGestureRecognizer

- (void)viewDidLoad 
{
   [super viewDidLoad];

   // Swipe Left
   UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeLeft:)];
   swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
   [arabicView addGestureRecognizer:swipeLeft];

   // Swipe Right
   UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeRight:)];
   swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
   [englishView addGestureRecognizer:swipeRight];
}

- (void)handleSwipeLeft:(UISwipeGestureRecognizer *)recognizer 
{
  [self performSelector:@selector(moveAtRight) withObject:nil afterDelay:0.01f];
}

- (void)handleSwipeRight:(UISwipeGestureRecognizer *)recognizer 
{
  [self performSelector:@selector(moveAtLeft) withObject:nil afterDelay:0.01f];
}


-(void)moveAtRight
{
  englishView.frame = CGRectMake(0, 0, 53, 53);
  englishView.backgroundColor = [UIColor lightGrayColor];
  arabicView.frame = CGRectMake(53, 0, 205, 53);
  english.text = @"English";
  arabic.text = @"Arabic";
  arabicView.backgroundColor = [UIColor blueColor];
  [dragview removeFromSuperview];
}


-(void)moveAtLeft
{
  englishView.frame = CGRectMake(0, 0, 205, 53);
  arabicView.frame = CGRectMake(205, 0, 53, 53);
  arabicView.backgroundColor = [UIColor lightGrayColor];
  englishView.backgroundColor = [UIColor blueColor];
  english.text = @"English";
  arabic.text = @"Arabic";
  [dragview removeFromSuperview];
}

在上面的代码中，我将背景颜色设置为蓝色。如果您想更改任何其他颜色。

初始

当我滑动到阿拉伯语时

当我滑动到英文时

上面这些是输出。

选项 2:PanGestureRecognizer

现在我尝试使用您的 PanGestureRecognizer 代码。我分别为 englishView 和 arabicView 设置了框架和背景颜色。现在它工作正常。

- (void)viewDidLoad 
{
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.

  _drawPath = [UIBezierPath
                          bezierPathWithRoundedRect:CGRectMake(0, 0, 140, 35)
                          byRoundingCorners:(UIRectCornerBottomLeft | UIRectCornerBottomRight | UIRectCornerTopLeft | UIRectCornerTopRight)
                          cornerRadii:CGSizeMake(4, 4)
                          ];
  _rectLayer = [[CAShapeLayer alloc] init];
  _rectLayer.path = _drawPath.CGPath;
  _rectLayer.strokeColor = [UIColor blackColor].CGColor;
  _rectLayer.lineWidth = 2.0f;
  _rectLayer.fillColor = [UIColor clearColor].CGColor;
  _rectLayer.strokeEnd = 0.f;
  [vi.layer addSublayer:_rectLayer];

  [self drawRectangle:nil];

  UIPanGestureRecognizer *gesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)];
  [gesture setMinimumNumberOfTouches:1];
  [gesture setMaximumNumberOfTouches:1];
  [englishView addGestureRecognizer:gesture];

  UIPanGestureRecognizer *gesture1 = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)];
  [gesture1 setMinimumNumberOfTouches:1];
  [gesture1 setMaximumNumberOfTouches:1];
  [arabicView addGestureRecognizer:gesture1];
}

- (void)handleGesture:(UIPanGestureRecognizer *)gestureRecognizer
{

   if (gestureRecognizer.state == UIGestureRecognizerStateChanged)
   {
      NSLog(@"Changed");
      CGPoint velocity = [gestureRecognizer velocityInView:gestureRecognizer.view];
      CGPoint translation = [gestureRecognizer translationInView:gestureRecognizer.view];

      if(velocity.x > 0)
      {
            NSLog(@"gesture went right");
            gestureRecognizer.view.frame = CGRectMake(gestureRecognizer.view.frame.origin.x + translation.x, 0, gestureRecognizer.view.frame.size.width, gestureRecognizer.view.frame.size.height);
            NSLog(@"The gestureRecognizer frame is - %@",NSStringFromCGRect(gestureRecognizer.view.frame));
            [englishView setFrame:CGRectMake(0, englishView.frame.origin.y, 205, englishView.frame.size.height)];
            [englishView setBackgroundColor:[UIColor colorWithRed:(15/255.0f) green:(97/255.0f) blue:(163/255.0f) alpha:1.0f]];
            [arabicView setFrame:CGRectMake(205, arabicView.frame.origin.y, 53, arabicView.frame.size.height)];
            [arabicView setBackgroundColor:[UIColor lightGrayColor]];
            [gestureRecognizer setTranslation:CGPointMake(0, 0) inView:dragV];
            [dragview removeFromSuperview];

    }
    else
    {
            NSLog(@"gesture went left");
            gestureRecognizer.view.frame = CGRectMake(gestureRecognizer.view.frame.origin.x + translation.x, 0, gestureRecognizer.view.frame.size.width, gestureRecognizer.view.frame.size.height);
            [arabicView setFrame:CGRectMake(53, arabicView.frame.origin.y, 205, arabicView.frame.size.height)];
            [englishView setFrame:CGRectMake(0, englishView.frame.origin.y,53,englishView.frame.size.height)];
            [arabicView setBackgroundColor:[UIColor colorWithRed:(15/255.0f) green:(97/255.0f) blue:(163/255.0f) alpha:1.0f]];
            [englishView setBackgroundColor:[UIColor lightGrayColor]];
            [gestureRecognizer setTranslation:CGPointMake(0, 0) inView:dragV];
            [dragview removeFromSuperview];
    }
  }
}

首先运行应用程序

中指指向阿拉伯语观点

中指指向英文 View