【发布时间】：2018-07-14 18:08:43
【问题描述】：
所以，我写了一个程序
那是一个地图应用程序，允许用户查看那里的位置
当他们打开应用程序并双击它时，他们可以放下图钉
隐藏的底部视图显示出来，我想在该视图中显示图像，因为我使视图的高度非常小，我无法使用情节提要在其中添加组件，我添加了一个活动指示器
使用代码，但由于某种原因，活动指示器未显示在屏幕上
即使隐藏视图的高度发生变化并出现。这是代码
import UIKit
import MapKit
import CoreLocation
class MapVC: UIViewController, UIGestureRecognizerDelegate {
@IBOutlet weak var pullUpViewHighConstraint: NSLayoutConstraint!
@IBOutlet weak var pullUpView: UIView!
@IBOutlet weak var mapView: MKMapView!
var locationManager = CLLocationManager()
var authStatus = CLLocationManager.authorizationStatus()
let regiounRadius: Double = 1000
var spinner: UIActivityIndicatorView?
var progrssLabel: UILabel?
var screen = UIScreen.main.bounds
override func viewDidLoad() {
super.viewDidLoad()
mapView.delegate = self
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.mapView.showsUserLocation = true
configureLocationServices()
addDoubleTap()
}
func addDoubleTap() {
let doubleTap = UITapGestureRecognizer(target: self, action: #selector(droupPin(sender:)))
doubleTap.numberOfTapsRequired = 2
doubleTap.delegate = self
mapView.addGestureRecognizer(doubleTap)
}
func addSwipe() {
let swipe = UISwipeGestureRecognizer(target: self, action: #selector(animateViewDown))
swipe.direction = .down
pullUpView.addGestureRecognizer(swipe)
}
func animateViewUp() {
pullUpViewHighConstraint.constant = 300
UIView.animate(withDuration: 0.4) {
self.view.layoutIfNeeded()
}
}
@objc func animateViewDown() {
pullUpViewHighConstraint.constant = 0
UIView.animate(withDuration: 0.4) {
self.view.layoutIfNeeded()
}
}
func addSpinner() {
spinner = UIActivityIndicatorView()
spinner?.center = CGPoint(x: screen.width / 2 - (spinner?.frame.width)! / 2, y: 150)
spinner?.activityIndicatorViewStyle = .whiteLarge
spinner?.color = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 1)
spinner?.stopAnimating()
pullUpView.addSubview(spinner!)
}
@IBAction func centerMapBtnPressed(_ sender: Any) {
if authStatus == .authorizedAlways || authStatus == .authorizedWhenInUse{
centerMapOnUserLocation()
// removePin()
}else {return}
}
}
extension MapVC: MKMapViewDelegate {
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
if annotation is MKUserLocation {
return nil
}
let pinAnnotation = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "droppablePin")
pinAnnotation.pinTintColor = #colorLiteral(red: 0.9771530032, green: 0.7062081099, blue: 0.1748393774, alpha: 1)
pinAnnotation.animatesDrop = true
return pinAnnotation
}
func centerMapOnUserLocation() {
guard let coordinets = locationManager.location?.coordinate else { return }
let coordinateRegion = MKCoordinateRegionMakeWithDistance(coordinets, regiounRadius*2.0, regiounRadius*2.0)
mapView.setRegion(coordinateRegion, animated: true)
}
@objc func droupPin(sender: UITapGestureRecognizer) {
removePin()
animateViewUp()
addSwipe()
addSpinner()
let touchPoint = sender.location(in: mapView)
let touchCoordinate = mapView.convert(touchPoint, toCoordinateFrom: mapView)
let annotation = DroppablePin(coordinatee: touchCoordinate, identifierr: "droppablePin")
mapView.addAnnotation(annotation)
let coordinateRegion = MKCoordinateRegionMakeWithDistance(touchCoordinate, regiounRadius*2.0, regiounRadius*2.0)
mapView.setRegion(coordinateRegion, animated: true)
}
func removePin() {
for annotation in mapView.annotations {
mapView.removeAnnotation(annotation)
}
}
}
extension MapVC: CLLocationManagerDelegate {
func configureLocationServices() {
if authStatus == .notDetermined {
locationManager.requestAlwaysAuthorization()
}
else {
return
}
}
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
centerMapOnUserLocation()
}
}
【问题讨论】：
-
永远不要在外部网站上上传代码。使用正确的代码格式在您的问题中包含Minimal, Complete and Verifiable example。
-
@DávidPásztor 我如何编辑问题
-
您可以将第一句巨大的句子拆分成更小的句子以增加可读性..（您的问题下方有一个编辑按钮）
-
他说微调器没有显示
-
@MilanNosáľ 现在没有
标签： ios swift uiactivityindicatorview uiactivity