MKMapView 在点击时隐藏导航栏，就像在照片应用程序中一样，而不会丢失 MKMapView 的功能

Question

我想隐藏并显示点击时的导航栏，就像照片应用程序中的导航栏一样 但不会失去 MKMapView 的功能。用户仍然应该能够双击进行缩放、捏合和缩放，并能够选择注释。

我尝试过：

 UITapGestureRecognizer* tapRec = [[UITapGestureRecognizer alloc] 
                                  initWithTarget:self action:@selector(hideBar:)];
[self.myMKMapView addGestureRecognizer:tapRec];
[tapRec release];

但是用户无法再选择注释！而且它也会在双击时隐藏。

有什么想法吗？

Answer 1

我知道，这几乎晚了一年，但我希望有人可以利用它。根据 @Cocoanetics 的回答，我是这样做的：

BOOL                mapReceivedDoubleTap;

...

UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(didTapMap:)];
[tapGestureRecognizer setDelegate:self];
[_mapView addGestureRecognizer:tapGestureRecognizer];
[tapGestureRecognizer release];

...

// ignore annotations
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    return (![[touch view] isKindOfClass:[MKAnnotationView class]]);
}

// take care of double taps for zoom
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer  shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {

    if([otherGestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]) {
        UITapGestureRecognizer *tr = (UITapGestureRecognizer *)otherGestureRecognizer;
        if(tr.numberOfTapsRequired == 2)
            mapReceivedDoubleTap = YES;
    }

    return NO;
}

- (void)didTapMap:(UITapGestureRecognizer *)tapGestureRecognizer {

    mapReceivedDoubleTap = NO;

    // hide/show on delay
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, .2f * NSEC_PER_SEC);
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
        if(!mapReceivedDoubleTap)
            [self.navigationController setNavigationBarHidden:!self.navigationController.navigationBarHidden animated:YES];
    });
}

Swift

import MapKit

class MapViewController: UIViewController, UIGestureRecognizerDelegate {

    @IBOutlet weak var myMapView: MKMapView!

    var mapReceivedDoubleTap = false

    override func viewDidLoad() {
        super.viewDidLoad()

        let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(MapViewController.didTapMap(_:)))            
        tapGestureRecognizer.delegate = self            
        myMapView.addGestureRecognizer(tapGestureRecognizer)
    }

    // ignore annotations
    func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
        return !touch.isKindOfClass(MKAnnotationView)
    }

    // take care of double taps for zoom
    func gestureRecognizer(gestureRecognizer: UIGestureRecognizer,
                           shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {

        if otherGestureRecognizer.isKindOfClass(UITapGestureRecognizer) {
            let tr = otherGestureRecognizer as! UITapGestureRecognizer
            if tr.numberOfTapsRequired == 2 {
                mapReceivedDoubleTap = true
            }
        }

        return false
    }

    func didTapMap(gestureRecognizer: UIGestureRecognizer) {

        mapReceivedDoubleTap = false

        // hide/show on delay
        let popTime = dispatch_time(DISPATCH_TIME_NOW, Int64(0.2 * Double(NSEC_PER_SEC)))
        dispatch_after(popTime, dispatch_get_main_queue(), {
            if !self.mapReceivedDoubleTap {
                self.navigationController?.setNavigationBarHidden(!(self.navigationController?.navigationBarHidden)!, animated: true)
            }
        })
    }
}

Answer 2

您可能需要实现此手势识别器的委托方法，以便与 MKMapView 上的手势识别器同时检测。然后，您需要延迟执行隐藏/显示，如果选择了注释，则需要取消此操作。

或者，您可以在委托方法中执行 hitTest，如果命中视图是 MKAnnotationView，则可以防止触摸传递到您的手势。

Answer 3

您可以告诉手势识别器仅在地图上的每个手势识别器都失败时才触发。

 UITapGestureRecognizer* tapRec = [[UITapGestureRecognizer alloc] 
                                  initWithTarget:self action:@selector(hideBar:)];
for (UIGestureRecognizer recognizer in self.myMKMapView.gestureRecognizers) {
    [tapRec requireGestureRecognizerToFail:recognizer];
}
[self.myMKMapView addGestureRecognizer:tapRec];
[tapRec release];

我不知道这是一个处理注释的gestureRecognizer。我猜你必须尝试一下。

Answer 4

您可以使用以下代码防止单击手势识别器窃取双击手势：

self.singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
singleTap.numberOfTapsRequired = 1;
for (UIGestureRecognizer* recognizer in self.mapView.gestureRecognizers) {
    if([recognizer isKindOfClass: [UITapGestureRecognizer class]] && ((UITapGestureRecognizer*)recognizer).numberOfTapsRequired == 2) {
        [singleTap requireGestureRecognizerToFail:recognizer];
    }
}
[self.mapView addGestureRecognizer:self.singleTap];

可以以相同的方式防止它窃取其他手势。