CODEWITHSUNDEEP
swiftxcode
user440309
user440309

Reputation: 63

Disable textfield in destination view controller

I have two view controllers: ViewController1 and ViewController2. My objective is, when the segue is triggered if a certain condition in ViewController1 is met a textfield in viewController2 to be disabled.

I have setup shouldPerformSegueWithIdentifier and prepareForSegue and everything works fine, but when i put the condition it crash saying that it found an error unwrapping an optional- the textfield. my ViewController1 is :

override func shouldPerformSegueWithIdentifier(identifier: String, sender: AnyObject!) -> Bool {
    if condition1=true{
        return true
    }
    else{
        return false
    }
}

override  func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
    if  (segue.identifier=="segue"){
        let destVC:ViewController=segue.destinationViewController as! ViewController2
        if n==1{
            destVC.myTextField.enabled=false
        }
    }
}

Upvotes: 0

Views: 87

Answers (3)

Nirav D
Nirav D

Reputation: 72440

In prepareForSegue method myTextField of ViewController2 is not initialized yet, so thats why you are getting an error unwrapping an optional textField, To solve your crash create one Bool instance inside your ViewController2 and pass its value in prepareForSegue method.

override  func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
     if  (segue.identifier=="segue"){
          let destVC:ViewController=segue.destinationViewController as! ViewController2
          if n==1{
              destVC.isEnabled=false
          }
     }
}

Create instance isEnabled inside ViewController2 like this and used it in the viewDidLoad of ViewController2

var isEnabled: Bool = true

override func viewDidLoad() {
    super.viewDidLoad()
    self.myTextField.enabled = self.isEnabled
}

Upvotes: 2

Anand Nimje
Anand Nimje

Reputation: 6251

You can set condition at your destination view controller then you can do this 

myTextField.userInteractionEnabled = false

Enable and disable userInteractionEnabled of your textfield.

Upvotes: 0

Matt Weinecke
Matt Weinecke

Reputation: 602

The views associated with the destination controller are not yet loaded/instantiated at that point.

Create an instance boolean flag on the destination VC and set that in the prepare segue function. Then in viewDidLoad or later in the destination VC check for that switch and disable the text field.

Upvotes: 0

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