ios - 自定义双击放大 MKMapView (Uber like)

Question

双击 MKMapView 时，我试图达到与 Uber 应用程序相同的效果。

它不会放大用户点击的点，而是放大 map 的当前中心。

这是我迄今为止尝试过的:

删除原来的双击手势识别器

添加我自己的手势识别器来处理自己的缩放

但是，即使删除原来的双击手势识别器似乎有效，我的新手势识别器选择器也不会被触发。

- (void)viewDidLoad
{
    [self removeDefaultDoubleTapToZoomGestureRecognizer];
    [self addCustomDoubleTapToZoomGestureRecognizer];
}

- (void)removeDefaultDoubleTapToZoomGestureRecognizer
{
    [self findAndRemoveDefaultDoubleTapToZoomInView:self.map];
}

- (void)findAndRemoveDefaultDoubleTapToZoomInView:(UIView *)view
{
    NSArray *gestureRecognizers = view.gestureRecognizers;
    for (UIGestureRecognizer *gestureRecognizer in gestureRecognizers)
    {
        if ([gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]])
        {
            UITapGestureRecognizer *tapGestureRecognizer = (UITapGestureRecognizer *)gestureRecognizer;
            if (tapGestureRecognizer.numberOfTapsRequired == 2 && tapGestureRecognizer.numberOfTouchesRequired == 1)
            {
                [view removeGestureRecognizer:tapGestureRecognizer];
            }
        }
    }

    for (UIView *subView in view.subviews)
    {
        [self findAndRemoveDefaultDoubleTapToZoomInView:subView];
    }
}

- (void)addCustomDoubleTapRecognizer
{
    UIView *view = self.mapView;
    UITapGestureRecognizer *gestureRecognizer = self.customDoubleTapGestureRecognizer;

    [view addGestureRecognizer:gestureRecognizer];
}

- (IBAction)customDoubleTapGestureRecognizerTapped:(UITapGestureRecognizer *)sender
{
    NSLog(@"double tap");
}

customDoubleTapGestureRegonizer属性(property)和 -customDoubleTapGestureRecognizerTapped:方法已从 IB 添加。

任何帮助将不胜感激。

Answer 1

我正在做一些与你非常相似的事情，它对我有用。如果可能，我会从 IB 中删除双击识别器逻辑，而是从您的 addCustomDoubleTapRecognizer 手动添加它。像这样的实现

- (void)addCustomDoubleTapRecognizer {
  UIView *view = self.mapView;

  UITapGestureRecognizer *gestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(zoomInGesture)];
  [view addGestureRecognizer:gestureRecognizer];
  gestureRecognizer.numberOfTapsRequired = 2;
}

然后添加 zoomInGesture像这样的方法

- (void)zoomInGesture {
  MKCoordinateRegion region = self.mapView.region;
  MKCoordinateSpan span = self.mapView.region.span;
  span.latitudeDelta *= 0.5;
  span.longitudeDelta *= 0.5;
  region.span = span;
  [self.mapView setRegion:region animated:YES];
}

它对我有用，当用户双击 map 上的任意位置时，它会放大当前的 map 中心。