CODEWITHSUNDEEP
iosswiftuibutton
Nitish
Nitish

Reputation: 14123

UIButton gradient effect issue on viewDidLoad

My question is not regarding how to set gradient for UIButton, but where to set it. This is how I am setting it : 

let btnGradient = CAGradientLayer()
btnGradient.frame = button_start_course.bounds
btnGradient.colors = [(UIColor(red: 174.0 / 255.0, green: 127.0 / 255.0, blue: 183.0 / 255.0, alpha: 1.0).CGColor as CGColorRef), (UIColor(red: 78.0 / 255.0, green: 57.0 / 255.0, blue: 96.0 / 255.0, alpha: 1.0).CGColor as CGColorRef)]
button_start_course.layer.insertSublayer(btnGradient, atIndex: 0)

When I call this in viewDidLoad, button_start_course gives incorrect bounds. To fix this, I called this code in viewDidAppear. It works fine except for, the colour originally set for button_start_course on storyboard appears first and then it changes to the gradient color.
How to fix this ?

Upvotes: 2

Views: 391

Answers (3)

Xchord
Xchord

Reputation: 688

Add the code in viewDidLayoutSubviews. To call it once, declare a boolean that set to true when the view did finish laying out subview.

override func viewDidLayoutSubviews() {
   super.viewDidLayoutSubviews()

   if !viewDidLayoutSubviews {
      viewDidLayoutSubviews = true
      // Code here
   }
}

Upvotes: 2

Rijo Payyappilly
Rijo Payyappilly

Reputation: 801

You could set the gradient inside -(void)viewDidLayoutSubviews

Upvotes: 2

Aravind
Aravind

Reputation: 1080

set the gradient inside the viewWillAppear instead of viewDidAppear

Upvotes: 0

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