[英]Memory management issue google maps on UITableViewCell in SWIFT 4
我實現的方式是:
我有一個筆尖:UITableViewCell,並且有一個實現有兩個標記和兩個標記之間的路徑的谷歌地圖。
當我在UItableView上使用示例8個單元格運行該程序時, 由於內存管理問題而退出應用程序 ,它有時崩潰了
在筆尖文件“ BookingHistoryTableViewCell”中 :
import UIKit
import Google
import GoogleMaps
import GoogleMapsCore
import GooglePlaces
import GoogleToolboxForMac
class BookingHistoryTableViewCell: UITableViewCell {
//MARK: Outlets
@IBOutlet weak var bottomView: UIView!
@IBOutlet weak var mapView: GMSMapView!
override func awakeFromNib() {
super.awakeFromNib()
self.bottomView.layer.shadowColor = UIColor(displayP3Red: 0, green: 0, blue: 0, alpha: 1).cgColor
self.bottomView.layer.shadowRadius = 3
self.bottomView.layer.shadowOpacity = 1
self.bottomView.layer.shadowOffset = CGSize(width: 0, height: 0)
}
//main gate : 6.795046, 79.900768
func setupMap(){
let lat = 6.797222
let lon = 79.902028
let camera = GMSCameraPosition.camera(withLatitude: lat, longitude: lon, zoom: 17.0)
let googleMapView = GMSMapView.map(withFrame: self.mapView.bounds, camera: camera)
// googleMapView.isMyLocationEnabled = true
// googleMapView.settings.tiltGestures = false
// googleMapView.settings.zoomGestures = false
// googleMapView.settings.scrollGestures = false
// googleMapView.accessibilityScroll(UIAccessibilityScrollDirection.left)
// googleMapView.mapStyle(withFilename: "googleMapsStyle02", andType: "json")
self.mapView.addSubview(googleMapView)
//(googleMapView, at: 0)
let marker = GMSMarker()
marker.position = CLLocationCoordinate2DMake(lat, lon)
marker.title = "Main Title"
marker.snippet = "Deescription"
marker.map = googleMapView
}
override func layoutSubviews() {
super.layoutSubviews()
//self.setupMap()
}
override func layoutIfNeeded() {
super.layoutIfNeeded()
self.setupMap()
}
override func setNeedsLayout() {
super.setNeedsLayout()
// self.setupMap()
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
}
然后在MyBookingsViewController的 tableViews上:
viewDidLoad(){
self.tableView.register(UINib(nibName: "BookingHistoryTableViewCell" , bundle: nil), forCellReuseIdentifier: "BookingHistoryTableViewCell")
self.tableView.rowHeight = UITableViewAutomaticDimension
self.tableView.estimatedRowHeight = 30
}
然后作為擴展我有表控件:
extension MyBookingsViewController: UITableViewDelegate, UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 8
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "BookingHistoryTableViewCell", for: indexPath) as! BookingHistoryTableViewCell
cell.selectionStyle = .none
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("selected row number : \(indexPath.row)")
}
func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
let editAction = UIContextualAction(style: .normal, title: "Edit") { (action, view, handler) in
print("tapped on Edit : \(indexPath.row)")
}
let deleteAction = UIContextualAction(style: .destructive, title: "Delete") { (action, view, handler) in
print("tapped on Delete : \(indexPath.row)")
}
editAction.backgroundColor = UIColor(displayP3Red: 183/255, green: 183/255, blue: 183/255, alpha: 0.9)
editAction.image = #imageLiteral(resourceName: "icon_edit_white")
deleteAction.backgroundColor = UIColor(displayP3Red: 251/255, green: 86/255, blue: 92/255, alpha: 0.9)
deleteAction.image = #imageLiteral(resourceName: "icon_delete_white")
let configuaration = UISwipeActionsConfiguration(actions: [deleteAction, editAction])
configuaration.performsFirstActionWithFullSwipe = true
return configuaration
}
}
這是必需的,在現實生活中,將有100個這樣的單元。 有什么方法可以只將可見的單元格渲染到顯示區域,也可以通過某種方法來保存內存?
我的建議是不要在每個單元上實現一個映射。 我遇到了同樣的麻煩,但是區別在於我正在使用Apple Maps。 Apple MapView可以顯示不同的內容(建築物,3D視圖,位置...)。如果您在Google Maps中有某種此類元素,請嘗試將其停用。
在我的應用中,正在使用的RAM從300更改為165。
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