iOS MapView：点击时添加注释，但如果现有注释被点击则不添加

Question

我有一个 UITapGestureRecognizer 设置来在用户单击的地图上添加注释。我遇到的问题是当用户点击现有注释以查看工具提示时，工具提示会弹出，但另一个注释会添加到单击的注释后面的地图中。有没有办法在添加注释之前检测注释是否被点击并返回？

这是我的 viewDidLoad：

UITapGestureRecognizer *singleTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(foundTap:)];
singleTapRecognizer.numberOfTapsRequired = 1;
[self.mapView addGestureRecognizer:singleTapRecognizer];

还有我的触控功能：

-(IBAction)foundTap:(UITapGestureRecognizer *)recognizer
{
    CGPoint point = [recognizer locationInView:self.mapView];

    CLLocationCoordinate2D tapPoint = [self.mapView convertPoint:point toCoordinateFromView:self.view];

    AGIAnnotation * annotation = [[AGIAnnotation alloc] initWithCoordinate:tapPoint];
    // Some other stuff

    [self.mapView addAnnotation:annotation];
}

感谢任何帮助。

Answer 1

有一个UIGestureRecognizerDelegate Protocol

实现gestureRecognizer:shouldReceiveTouch:，如果触摸在现有工具提示上，则返回NO。像这样的：

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    if ([touch.view isKindOfClass:[MKPinAnnotationView class]])
    {
        return NO;
    }
    return YES;
}

Answer 2

@mbehan 在 Swift 3+ 中回答：

在 ViewDidLoad 中：

let singleTapRecognizer = UITapGestureRecognizer(target: self, action: #selector(YourClass.foundTap(_:)))
singleTapRecognizer.delegate = self
mapView.addGestureRecognizer(singleTapRecognizer)

和 UIGestureRecognizerDelegate 扩展：

extension YourClass: UIGestureRecognizerDelegate {
  func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
    return !(touch.view is MKPinAnnotationView)
  }
}