swift - Display an UIAlertView when app launches -


i'm trying add uialertview or controller when app first loads. currently, have code in viewdidload method.

let welcomealert = uialertcontroller(title: "hola", message: "this test.", preferredstyle: uialertcontrollerstyle.alert) welcomealert.addaction(uialertaction(title: "ok.", style: uialertactionstyle.default, handler: nil))  self.presentviewcontroller(welcomealert, animated: true, completion: nil)

why won't alert view display? used same code inside of ibaction button, , works expected.

you should displaying alert in viewdidappear: function. present subview or view controller, parent view controller has in view hierarchy.

the viewdidappear function "notifies view controller view added view hierarchy."

* documentation

so, code this:

class myviewcontroller: uiviewcontroller {      override func viewdidappear(animated: bool){         super.viewdidappear(animated)          let welcomealert = uialertcontroller(title: "hola", message: "this test.", preferredstyle: uialertcontrollerstyle.alert)         welcomealert.addaction(uialertaction(title: "ok.", style: uialertactionstyle.default, handler: nil))         self.presentviewcontroller(welcomealert, animated: true, completion: nil)     }  }

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