再次調用viewdidload並再次顯示viewdid

Question

我的應用程序是基於地理位置的應用程序。 我已經實現了一旦某些用戶按下“不允許位置服務”按鈕以再次引導他們進行設置以打開服務，便會彈出UIAlertview。

我面臨的問題是，當用戶最終打開按鈕時，由於我的數據調用函數位於viewdidload和viewdidappear ，因此數據沒有加載到tableview中。 有沒有辦法再次調用這些函數？

我做了下面的事情，它完全崩潰了我的應用程序：

extension ExploreViewController: CLLocationManagerDelegate {
func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {

    switch status {
    case .Denied:
        // Changed status to denied
        self.locationAlert = UIAlertView(title: "Location Services Permission Needed", message: "Location service needs to be turned on to use Peek! Please press setting button below and turn the service on!", delegate: self, cancelButtonTitle: "Settings")
        locationAlert.show()
        break
    case .AuthorizedWhenInUse:
        self.viewDidLoad()
        self.viewDidAppear(true)
        break
    default
        break
}

當我這樣做時，它在使應用程序崩潰之前一直調用viewdidload大約百萬次。 任何建議表示贊賞

Answer 1

永遠永遠永遠永遠不會調用viewDidLoad或viewDidAppear （除了在后一種情況下，調用super ）。 它們是運行時發送給您的消息，用於報告視圖控制器生命周期的階段。

Answer 2

只需將數據調用函數移到viewDidLoad和viewDidAppear ：

代替

override func viewDidLoad() {
    // do some stuff
}

寫

override func viewDidLoad() {
    super.viewDidLoad()
    doSomeStuff()
}

func doSomeStuff() {
    // do some stuff
}

func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
    // do your current logic
    doSomeStuff()
}

Answer 3

func myCodeToRun() {
    //put all the code you want to run here
}

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    myCodeToRun()
}

extension ExploreViewController: CLLocationManagerDelegate {
func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {

switch status {
case .Denied:
    // Changed status to denied
    self.locationAlert = UIAlertView(title: "Location Services Permission Needed", message: "Location service needs to be turned on to use Peek! Please press setting button below and turn the service on!", delegate: self, cancelButtonTitle: "Settings")
    locationAlert.show()
    break
case .AuthorizedWhenInUse:
    myCodeToRun()
    break
default
    break

}