iOS Swift Scrollview Set Frame Position Programmatically

Question

I am have scrollview in my app. By default y position of my scrollview is 80. In some locations I need to move y position of my scrollview to 0. Here is the code

@IBOutlet weak var ScrollView: UIScrollView!
override func viewDidLoad()
{
   super.viewDidLoad()
   self.ScrollView.delegate = self
   if(Position == "changed")
   {
      self.ScrollView.frame = CGRect(x: 0, y: 0, width: self.ScrollView.frame.size.width, height: self.ScrollView.frame.size.height)
   }
   else
   {
      self.ScrollView.frame = CGRect(x: 0, y: 80, width: self.ScrollView.frame.size.width, height: self.ScrollView.frame.size.height)
   }
}

But this code won't works.

Checkout my answer, might help you: http://stackoverflow.com/questions/39936110/how-to-load-a-uiviewcontroller-inside-an-uiscrollview/39937248#39937248 — Aakash, Apr 20 '17 at 09:12
I am loading this same page from multiple view. If position value equals to `changed` I need to change the position — Kavin Kumar Arumugam, Apr 20 '17 at 09:15
@Aakash Sorry, I not able to get it clearly. Can you pls code me clearly — Kavin Kumar Arumugam, Apr 20 '17 at 09:22
Set the frame of scrollView in viewDidLayoutSubviews() method not in viewDidLoad() — Aakash, Apr 20 '17 at 09:32
if you are using autolayout then you need to add Scrollview.translatesAutoresizingMaskIntoConstraints = false before setting its frame — Ahmed Ginani, Apr 20 '17 at 11:05

score 1 · Answer 1 · answered Apr 20 '17 at 09:41

1

problem is simple your VC.view not updated in Viewdidload, so in here you need to move the UI updation on Viewdidappear or update the UI in main thread

by default your self.ScrollView.frame is started in O position, so only check with !=

override func viewDidLoad()
{
   super.viewDidLoad()
   self.ScrollView.delegate = self
   //self.ScrollView.frame = CGRect(x: 0, y: 0, width: self.ScrollView.frame.size.width, height: self.ScrollView.frame.size.height)
   if(Position != "changed")
   {
     DispatchQueue.main.async {
        self.ScrollView.frame = CGRect(x: 0, y: 80, width: self.ScrollView.frame.size.width, height: self.ScrollView.frame.size.height)
    }

   }

}

answered Apr 20 '17 at 09:41

Anbu.Karthik

82,064
23
174
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change your ScrollView contentsize also – Anbu.Karthik Apr 20 '17 at 09:47
It works but I write those codes inside `viewDidAppear` – Kavin Kumar Arumugam Apr 20 '17 at 11:28
1

@KavinKumarArumugam - choice is urs , happy day – Anbu.Karthik Apr 20 '17 at 11:29

score 1 · Accepted Answer · answered Apr 21 '17 at 06:57

1

We will not able to set Scrollview Position in viewDidLoad() so Add those code in viewDidAppear(). Final Code Here

override func viewDidAppear(_ animated: Bool)
{
     DispatchQueue.main.async
     {
          self.ScrollView.frame = CGRect(x: 0, y: 0, width: self.ScrollView.frame.size.width, height: self.ScrollView.frame.size.height + 80)
     }
}

answered Apr 21 '17 at 06:57

Kavin Kumar Arumugam

1,792
3
28
47

if your VC embed in navigation controller , the UI will render correctly for your concept if you navigate once to another VC and come back – Anbu.Karthik Oct 11 '17 at 07:02

iOS Swift Scrollview Set Frame Position Programmatically

2 Answers2