我有一个带有注释的 mapView，当单击它时，它会移动到一个新的 viewController。然后，当用户选择从详细信息披露返回到 mapView 时，我希望 mapView 具有与用户在单击详细信息披露之前相同的 View 。以下是我到目前为止设置的代码，但是，当用户从详细信息披露中单击返回时， map 会缩小。我不确定如何重新创建以前的 View 。
详细披露 VC:
// here by segueing, I want to communicate to the MapView VC that the map should remain the same
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if (segue.identifier == "backButtonTapped" )
{
let destinationVC = segue.destination as! TabBarVC
mapStatus = "wentBack"
print("The value of mapStatus after seguing is \(mapStatus)")
destinationVC.selectedIndex = 1
}
}
map View VC:
override func viewDidAppear(_ animated: Bool) {
// here if the mapStatus is not the correct value (the user never used the detail disclosure), the map will just snap onto the current location
if mapStatus == "wentBack" {
print("Do not update location")
// assuming appropriate code is placed here but I am not sure what it is
} else {
print("Updated Current Location")
let center = CLLocationCoordinate2D(latitude: self.lastLocation.coordinate.latitude, longitude: self.lastLocation.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))
map.setRegion(region, animated: true)
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
if #available(iOS 8.0, *) {
locationManager.requestAlwaysAuthorization()
} else {
// Fallback on earlier versions
}
let noLocation = CLLocationCoordinate2D()
let viewRegion = MKCoordinateRegionMakeWithDistance(noLocation, 200, 200)
map.setRegion(viewRegion, animated: false)
}
}
最佳答案
事实证明， map 不会持续存在，因为当用户返回详细信息披露时调用 viewDidLoad(使用 prepareForSegue)。我用过
@IBAction func backButtonTapped(_ sender: UIBarButtonItem) {
self.dismiss(animated: true)
mapStatus = "wentBack"
}
为了关闭 viewController，只调用 viewDidAppear 而不是 viewDidLoad。
关于ios - Swift 3.0 map 返回到以前的 MapView，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44894949/