如何解决滑块移动时删除注释-迅速
我的注释无法解决。当您单击UIButton时，@ IBAction pressPlay函数启动，这将导致地图上的滑块开始移动。滑块的最大值为0，最小值为-31，初始值为0，仅当拇指位于适当位置时它才开始移动！ =从0开始，每1秒移动一次。这样可以正确移动滑块。
@IBAction func pressPlay(_ sender: Any)
{
let calendar2 = Calendar.current
let today = Date()
var cnt = Int(sliderTime.value)
let play = UIImage(named: "play")
let pause = UIImage(named: "pause")
let format = DateFormatter()
playButton.setImage(play,for: .normal)
if control == true && Int(sliderTime.value) < 0
{ //mette in play
control = false
playButton.setImage(pause,for: .normal)
//removeSeismometers = true
if Int(sliderTime.value) < 0
{
timer = Timer.scheduledTimer(withTimeInterval: 1,repeats: true)
{ [self]t in //ogni secondo questo timer cambia il valore dell'alpha del pin che sta vibrando
if cnt < 0
{
cnt = Int(self.sliderTime.value)
self.sliderTime.value += 1
let newDate2 = calendar2.date(byAdding: .day,value: Int(self.sliderTime.value),to:today)! //sottraggo alla data attuale il vlaore dello slider per tornare indietro nel tempo
format.dateStyle = .medium // "MM/GG/AAAA"
self.labelTime.text = "\(format.string(from: newDate2))"
appo += 1
for i in mapEqAnnotation{
let str: String = i.eq.eventTime
let index = str.index(str.endIndex,offsetBy: -9)
let mySubstring = str[..<index]
nuovaData = calendario.date(byAdding: .day,value: Int(sliderTime.value),to:dataCorrente)!
let format = DateFormatter()
format.dateFormat = "yyyy-MM-dd"
let dataCntr = "\(format.string(from: nuovaData))"
if mySubstring == dataCntr{
printQuake(quake: i)
}else{
removeQuake(quake:i)
}
}
//printQuake(sliderValue: appo)
}else if cnt == 0{
//removeSeismometers = false
playButton.setImage(play,for: .normal)
timer!.invalidate()
}
}
}
}else if control == false && Int(sliderTime.value) < 0 {
playButton.setImage(play,for: .normal)
control = true
timer!.invalidate()
}
}
我的问题是，单击UIButton时，滑块必须每秒移动一次，并且必须在地图上添加注释，并在再次移动滑块后立即将其删除。 一切正常，除了当滚动条滚动时，上一个动作的注释不会消失，而是保留在地图上
func printQuake(quake: MapEarthquakeAnnotation){
let q = MapEarthquakeAnnotation(eq:quake.eq)
mapView.addAnnotation(q)
}
func mapView(_ mapView: MKMapView,viewFor annotation: MKAnnotation) -> MKAnnotationView?
{
if annotation is MapEarthquakeAnnotation{
annotazioni.append(annotation)
let EQAnnotation = annotation as! MapEarthquakeAnnotation
var view: MKPinAnnotationView
view = MKPinAnnotationView(annotation: annotation,reuseIdentifier: EQAnnotation.identifier)
view.canShowCallout = true
view.pinTintColor = UIColor.brown
return view
}else if (annotation is MapSeismometerAnnotation) {
if let annotation = annotation as? MapSeismometerAnnotation
{
var view: MKPinAnnotationView
view = MKPinAnnotationView(annotation: annotation,reuseIdentifier: annotation.identifier)
view.canShowCallout = true
view.pinTintColor = UIColor.green
view.image = UIImage(named: "pin-verde")
return view
}
return nil
}
return nil
}
能给我一些建议吗？
解决方法
在removeQuake中查看您使用的代码会很有帮助，但是在快速查看代码之后，很可能是代码
func printQuake(quake: MapEarthquakeAnnotation){
let q = MapEarthquakeAnnotation(eq:quake.eq)
mapView.addAnnotation(q)
}
在这里，每次调用此方法时都会创建一个新的注释。而且此注释不会保留在任何地方。因此，当您致电removeQuake(quake:i)时，不能指望i是使用printQuake添加的任何注释。
我不确定为什么要创建该代码，但是您可能要做的就是将此方法更改为
func printQuake(quake: MapEarthquakeAnnotation){
mapView.addAnnotation(quake)
}
通常，您的代码有点难以阅读。您应该研究使用Swift的更现代的方法，并且应该尝试拆分代码的各个部分，以便于阅读和维护。非英语语言也不是很有帮助。
我试图拆除并重建您的代码。并非所有内容都存在，并且我不确定它是否可以满足您的要求。但是仍然请检查一下。也许它将帮助您解决问题。
import UIKit
import MapKit
class ViewController: UIViewController {
@IBOutlet private var mapView: MKMapView!
@IBOutlet private var sliderTime: UISlider!
@IBOutlet private var playButton: UIButton!
@IBOutlet private var labelTime: UILabel!
private var timer: Timer?
private var earthquakeAnnotations: [MapEarthquakeAnnotation] = []
private var dayOffset: Int = -30 {
didSet {
refresh()
}
}
private var isPlaying: Bool = false {
didSet {
playButton.setImage(isPlaying ? UIImage(named: "play") : UIImage(named: "pause"),for: .normal)
}
}
private func refresh() {
let beginningOfToday: Date = Calendar.autoupdatingCurrent.date(from: Calendar.autoupdatingCurrent.dateComponents([.year,.month,.day],from: Date()))!
let presentedDay = Calendar.autoupdatingCurrent.date(byAdding: .day,value: dayOffset,to: beginningOfToday)!
refreshSlider()
refreshTimeLabel(date: presentedDay)
refreshAnnotations(date: presentedDay)
}
private func refreshSlider() {
sliderTime.value = Float(dayOffset)
}
private func refreshTimeLabel(date: Date) {
labelTime.text = {
let formatter = DateFormatter()
formatter.dateStyle = .medium
return formatter.string(from: date)
}()
}
private func refreshAnnotations(date: Date) {
earthquakeAnnotations.forEach { annotation in
if annotation.eq.date == date {
if !mapView.annotations.contains(where: { $0 === annotation }) {
mapView.addAnnotation(annotation)
}
} else {
if mapView.annotations.contains(where: { $0 === annotation }) {
mapView.removeAnnotation(annotation)
}
}
}
}
private func stopPlaying() {
timer?.invalidate()
timer = nil
isPlaying = false
}
private func startPlaying() {
if dayOffset < 0 {
isPlaying = true
timer?.invalidate() // Just in case
timer = Timer.scheduledTimer(withTimeInterval: 1.0,repeats: true,block: { [weak self] timer in
guard let self = self else {
timer.invalidate()
return
}
if self.dayOffset < 0 {
self.dayOffset += 1
} else {
self.stopPlaying()
}
})
} else {
// Already at the end. Should restart?
}
}
@IBAction func pressPausePlay(_ sender: Any) {
if isPlaying {
stopPlaying()
} else {
startPlaying()
}
}
}
// MARK: - MKMapViewDelegate
extension ViewController: MKMapViewDelegate {
func mapView(_ mapView: MKMapView,viewFor annotation: MKAnnotation) -> MKAnnotationView? {
if let annotation = annotation as? MapEarthquakeAnnotation {
let view: MKPinAnnotationView = MKPinAnnotationView(annotation: annotation,reuseIdentifier: annotation.identifier)
view.canShowCallout = true
view.pinTintColor = UIColor.brown
return view
} else if let annotation = annotation as? MapSeismometerAnnotation {
let view: MKPinAnnotationView = MKPinAnnotationView(annotation: annotation,reuseIdentifier: annotation.identifier)
view.canShowCallout = true
view.pinTintColor = UIColor.green
view.image = UIImage(named: "pin-verde")
return view
} else {
return nil
}
}
}
// MARK: - MapEarthquakeAnnotation
private extension ViewController {
class MapEarthquakeAnnotation: NSObject,MKAnnotation {
var identifier: String { "MapEarthquakeAnnotationID" }
let coordinate: CLLocationCoordinate2D
let eq: Earthquake
init(earthquake: Earthquake,coordinate: CLLocationCoordinate2D) { self.eq = earthquake; self.coordinate = coordinate }
}
}
// MARK: - MapSeismometerAnnotation
private extension ViewController {
class MapSeismometerAnnotation: NSObject,MKAnnotation {
var identifier: String { "MapSeismometerAnnotationID" }
let coordinate: CLLocationCoordinate2D
init(coordinate: CLLocationCoordinate2D) { self.coordinate = coordinate }
}
}
// MARK: - Earthquake
private extension ViewController {
struct Earthquake {
let eventTime: String
var date: Date {
let index = eventTime.index(eventTime.endIndex,offsetBy: -9)
let format = DateFormatter()
format.dateFormat = "yyyy-MM-dd"
return format.date(from: String(eventTime[..<index])) ?? Date()
}
}
}
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