Question

我正在使用apple的mapkit框架制作应用程序。我想要做的是从你按的位置获取经度和纬度。我使用以下代码从用户当前位置获取坐标：

- (IBAction)longpressToGetLocation:(id)sender {
    CLLocationCoordinate2D location = [[[self.mapView userLocation] location] coordinate];
    NSLog(@"Location found from Map: %f %f",location.latitude,location.longitude);
}

如何让代码显示按下的位置而不是userlocation？

Answer 1

首先，使用UIGestureRecognizer代替IBAction

- (void)longpressToGetLocation:(UIGestureRecognizer *)gestureRecognizer
{
    if (gestureRecognizer.state != UIGestureRecognizerStateBegan)
        return;

    CGPoint touchPoint = [gestureRecognizer locationInView:self.mapView];   
    CLLocationCoordinate2D location = 
        [self.mapView convertPoint:touchPoint toCoordinateFromView:self.mapView];

    NSLog(@"Location found from Map: %f %f",location.latitude,location.longitude);

}

Swift 2：

@IBAction func revealRegionDetailsWithLongPressOnMap(sender: UILongPressGestureRecognizer) {
    if sender.state != UIGestureRecognizerState.Began { return }
    let touchLocation = sender.locationInView(protectedMapView)
    let locationCoordinate = protectedMapView.convertPoint(touchLocation, toCoordinateFromView: protectedMapView)
    print("Tapped at lat: \(locationCoordinate.latitude) long: \(locationCoordinate.longitude)")
}

斯威夫特3：

@IBAction func revealRegionDetailsWithLongPressOnMap(sender: UILongPressGestureRecognizer) {
    if sender.state != UIGestureRecognizerState.began { return }
    let touchLocation = sender.location(in: protectedMapView)
    let locationCoordinate = protectedMapView.convert(touchLocation, toCoordinateFrom: protectedMapView)
    print("Tapped at lat: \(locationCoordinate.latitude) long: \(locationCoordinate.longitude)")
}

Answer 2

10-09 11:16:47.471    5464-5464/com.example.michaelheneghan.example1 I/art﹕ Not late-enabling -Xcheck:jni (already on)
10-09 11:16:47.471    5464-5464/com.example.michaelheneghan.example1 I/art﹕ Late-enabling JIT
10-09 11:16:47.473    5464-5464/com.example.michaelheneghan.example1 I/art﹕ JIT created with code_cache_capacity=2MB compile_threshold=1000
10-09 11:16:47.497    5464-5464/com.example.michaelheneghan.example1 W/System﹕ ClassLoader referenced unknown path: /data/app/com.example.michaelheneghan.example1-2/lib/x86
10-09 11:16:47.599    5464-5464/com.example.michaelheneghan.example1 D/AndroidRuntime﹕ Shutting down VM
10-09 11:16:47.599    5464-5464/com.example.michaelheneghan.example1 E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.example.michaelheneghan.example1, PID: 5464
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.michaelheneghan.example1/com.example.michaelheneghan.example1.MainActivity}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
            at android.app.ActivityThread.-wrap11(ActivityThread.java)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5417)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
     Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
            at android.view.ViewGroup.addViewInner(ViewGroup.java:4309)
            at android.view.ViewGroup.addView(ViewGroup.java:4145)
            at android.view.ViewGroup.addView(ViewGroup.java:4117)
            at com.example.michaelheneghan.example1.MainActivity.onCreate(MainActivity.java:105)
            at android.app.Activity.performCreate(Activity.java:6237)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
            at android.app.ActivityThread.-wrap11(ActivityThread.java)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5417)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Swift 4。

class mapviewCtrl: UIViewController, UIGestureRecognizerDelegate
{
    @IBOutlet var mapViewVar: MKMapView!
    override func viewDidLoad() {
    super.viewDidLoad()
    let lpgr = UILongPressGestureRecognizer(target: self, action:"handleLongPress:")
    lpgr.minimumPressDuration = 0.5
    lpgr.delaysTouchesBegan = true
    lpgr.delegate = self
    self.mapViewVar.addGestureRecognizer(lpgr)
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}
func handleLongPress(gestureReconizer: UILongPressGestureRecognizer) {
    if gestureReconizer.state != UIGestureRecognizerState.Ended {
        let touchLocation = gestureReconizer.locationInView(mapViewVar)
        let locationCoordinate = mapViewVar.convertPoint(touchLocation,toCoordinateFromView: mapViewVar)
        println("Tapped at lat: \(locationCoordinate.latitude) long: \(locationCoordinate.longitude)")
        return
    }
    if gestureReconizer.state != UIGestureRecognizerState.Began {
        return
    }
}

Answer 3

swift 3 的另一种方式是这个：这是一个包含少量代码片段的混搭 - 使用覆盖，您只需在一个地方更新代码，这样可以方便，增强模块性，并删除假设和潜在的崩溃点。

  override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    // Let's put in a log statement to see the order of events
    print(#function)

    for touch in touches {
        let touchPoint = touch.location(in: self.mapView)
        let location = self.mapView.convert(touchPoint, toCoordinateFrom: self.mapView)
        print ("\(location.latitude), \(location.longitude)")
    }
}

使用iphone mapkit获取tapped坐标

3 个答案: