ios - Strange behaviour - instantiating a UITextField in willMoveToSuperview as opposed to didMoveToSuperview -


i'm working xcode 6.3/ios/swift 1.2. i've stumbled upon strange behaviour don't understand (coming strong oo background).

put simply, if subclass uiview , use instantiate uitextfields; in constructor, overriding didmovetosuperview, on dynamically (ie, click event)... uitextfields work expected. however, when creating uitextfield object during willmovetosuperview, seems fine... doesn't respond touch events.

this demonstrated in code below (a uiviewcontroller , subclassed uiview). i've added gesture recognizer entire view containing uitextfields. clicking of them other 1 creating during willmovetosuperview, move focus textfield, , ignore touch event (as expected). however, clicking on 1 added during willmovetosuperview fires touch event. event without touch event... textfield remains unresponsive. can explain behaviour?

import uikit  class rootviewcontroller:uiviewcontroller {     override func viewdidload()     {         super.viewdidload()          self.view.frame = cgrectmake(0,0,500,500)      }      override func viewdidappear(animated: bool)     {         var uiview = extendeduiview()         view.addsubview(uiview)     } }  class extendeduiview:uiview {     internal var hasmovedtosuperview:bool = false      override init (frame : cgrect)     {         super.init(frame : frame)     }      convenience init()     {         self.init(frame:cgrectmake(0,0,500,500))          var tf: uitextfield = uitextfield(frame: cgrect(x: 0, y: 50, width: 300, height: 40))         tf.backgroundcolor = uicolor.greencolor()         tf.text = "init // ok"         addsubview(tf)     }      required init(coder adecoder: nscoder)     {         fatalerror("this class not support nscoding")     }      override func willmovetosuperview(newsuperview: uiview?)     {         if (!hasmovedtosuperview) {              var tf: uitextfield = uitextfield(frame: cgrect(x: 0, y: 100, width: 300, height: 40))             tf.backgroundcolor = uicolor.redcolor()             tf.text = "willmovetosuperview // not ok"             addsubview(tf)             }     }      override func didmovetosuperview()     {         if (!hasmovedtosuperview) {              var tf: uitextfield = uitextfield(frame: cgrect(x: 0, y: 150, width: 300, height: 40))             tf.backgroundcolor = uicolor.greencolor()             tf.text = "didmovetosuperview // ok"             addsubview(tf)              hasmovedtosuperview = true              addgesturerecognizer(uitapgesturerecognizer(target:self, action:selector("createtfdynamically:")))         }     }      func createtfdynamically(value:anyobject)     {         var tf: uitextfield = uitextfield(frame: cgrect(x: 0, y: 200, width: 300, height: 40))         tf.backgroundcolor = uicolor.greencolor()         tf.text = "createtfdynamically // ok"         addsubview(tf)     } }


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