I just begin to learn swift. And I have a question when I see a learning video. I have a screenshot.

Please post the code, we cannot get image on the forum.

I suppose imageView1 is an IBOutlet ?

Then, if you have connected the IBOutlet to the object in Interface Builder, system takes care to do the init.

But please, if that does not answer your question, show code to make sure we understand your question.

Otherwise, thanks to close the thread on this answer.

the code is:

Class ViewController: UIViewController{

@IBAction func playButton(sender: UIButton){

imageView1.animationImages=[UIImage(named:”pad”)]

}

@IBOutlet weak var imageView1:UIImageView!

That's what I explained:

In the code:

Class ViewController: UIViewController{
         @IBAction func playButton(sender: UIButton){
                  imageView1.animationImages=[UIImage(named:”pad”)]
         }

@IBOutlet weak var imageView1:UIImageView!

Line 6, you have defined imageView1 as an IBOutlet and connected to the object in IB (note the black dot on the left).

So, XCode automatically does the instantiation work to initialize imageView1.

That is a major interest of using storyboards.

Note a few point to fully understand:

- try to remove the connection of imageView1

- open the Connection inspector for the object in IB

- click the x in front of IBOutlet name in the connection inspector

- the black dot in code in front of line 6 becomes white, showing connection does not exist anymore

- try to run

- your app will crash

Reason is that now, object is not initilized !

- reconnect the object to its outlet

Second comment

Even though both ways work perfectly, it is a good practice to declare IBOutlets at the top :

Class ViewController: UIViewController{

     @IBOutlet weak var imageView1:UIImageView!

      @IBAction func playButton(sender: UIButton){
                  imageView1.animationImages=[UIImage(named:”pad”)]
         }
}

Thank you so much🙂