2
我试图在Swift 2中设置我的地图上的最小缩放级别。我找不到任何有关如何限制地图放大得太远的文档我决定尝试的是监视地图移动（例如拖动或缩放），然后将MKZoomScale设置回最小值。如何检测mapView在Swift中移动并更新缩放
我发现的regionDidChangeAnimated的大部分答案都在Objective C中，我不知道，但我很难将它们转换为Swift。
我尝试实现@ hEADcRASH的回答：https://stackoverflow.com/a/30924768/4106552，但是当地图在模拟器中移动时，它不会触发并将任何内容打印到控制台。
谁能告诉我我做错了什么？我是Swift新手，所以这可能是一个小错误。此外，让我知道是否有一个轻量级的方法来解决限制地图上的缩放级别。我担心移动显示器会让地图动画变慢一点。谢谢您的帮助。
这是我的视图控制器。 进口的UIKit 进口解析 进口MapKit
class SearchRadiusViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {
@IBOutlet weak var map: MKMapView!
@IBOutlet weak var menuBtn: UIBarButtonItem!
var locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
//menu button control
if self.revealViewController() != nil {
menuBtn.target = self.revealViewController()
menuBtn.action = "revealToggle:"
self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
}
//user location
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
//set map
let location:CLLocationCoordinate2D = manager.location!.coordinate
let latitude = location.latitude
let longitude = location.longitude
let latDelta:CLLocationDegrees = 0.1
let longDelta:CLLocationDegrees = 0.1
let span:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta)
let maplocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude)
let region:MKCoordinateRegion = MKCoordinateRegionMake(maplocation, span)
map.setRegion(region, animated: true)
//stop updating location, only need user location once to position map.
manager.stopUpdatingLocation()
}
//Attempt to monitor for map movement based on hEADcRASH's answer.
private var mapChangedFromUserInteraction = false
private func mapViewRegionDidChangeFromUserInteraction() -> Bool {
let view = self.map.subviews[0]
// Look through gesture recognizers to determine whether this region change is from user interaction
if let gestureRecognizers = view.gestureRecognizers {
for recognizer in gestureRecognizers {
if(recognizer.state == UIGestureRecognizerState.Began || recognizer.state == UIGestureRecognizerState.Ended) {
return true
}
}
}
return false
}
func mapView(mapView: MKMapView, regionWillChangeAnimated animated: Bool) {
print("yes")
mapChangedFromUserInteraction = mapViewRegionDidChangeFromUserInteraction()
if (mapChangedFromUserInteraction) {
// user changed map region
print("user changed map in WILL")
}
}
func mapView(mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
print("yes ddd")
if (mapChangedFromUserInteraction) {
// user changed map region
print("user changed map in Did")
}
}
}
您是否在故事板中设置mapView的委托？如果不是的话，你应该在viewDidLoad方法中添加self.map.delegate = self。 – lorenzoliveto
感谢@lorenzoliveto，将'self.map.delegate = self'添加到viewDidLoad正在工作。 mapViewRegionDidChangeAnimated正在工作！您是否有意见设置最大缩放级别的最佳方式？我应该走观看地图移动/缩放和重置地图缩放的路线吗？ – tylerSF
是的，我认为这是您拥有的唯一选择。 regionWillChangeAnimated：在滚动过程中多次调用，而regionDidChangeAnimated：在滚动后仅调用一次。尝试在两者中添加重置代码并查看性能如何受到影响。 – lorenzoliveto