Swift dynamic button create

Question

I am new in swift. I have created dynamic button by pressing another button in the same viewController with following code:

@IBAction func yenibtn(sender: AnyObject) {

    let btn = UIButton()
    btn.frame = CGRectMake(10, 10, 50, 50)  //set frame
    btn.setTitle("btn", forState: .Normal)  //set button title
    btn.setTitleColor(UIColor.redColor(), forState: .Normal) //set button title color
    btn.backgroundColor = UIColor.greenColor() //set button background color
    btn.tag = 1 // set button tag
    btn.addTarget(self, action: "btnclicked:", forControlEvents: .TouchUpInside) //add button action
    self.view.addSubview(btn) //add button in view



}
func clickMe(sender:UIButton!)
{
    print("Button Clicked")

}

and I created second viewController and navigate by performSegueWithIdentifier function. When i call back the previous controller the dynamic object disappears. Is there a way to retain dynamic button during reload of the previous ViewController?

Vyacheslav · Accepted Answer · 2017-01-17T22:25:15.503

2

Just use this:

   var btn:UIButton!
@IBAction func yenibtn(sender: AnyObject) {
btn= UIButton()
 btn.frame = CGRectMake(10, 10, 50, 50)  //set frame
///... your code
}

UPDATE

Using your code in the second viewcontroller to close

 @IBAction func basgeri(sender: AnyObject) {

        performSegueWithIdentifier("bir", sender: self)
    }

thinking "I'm closing the viewcontroller", BUT YOU ARE WRONG! You create a new ViewController! You are not returning to the previous one!

To fix it use this:

 @IBAction func basgeri(sender: AnyObject) {

presentingViewController?.dismissViewControllerAnimated(true, completion: nil)

    }

edited Jan 17 '17 at 22:25

answered Jan 17 '17 at 10:25

Vyacheslav

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I gives error: "fatal error: unexpectedly found nil while unwrapping an Optional value" – Alex Guba Jan 17 '17 at 10:45
When you see this ? – Vyacheslav Jan 17 '17 at 10:46
when i press button to run func yenibtn() function to create another button – Alex Guba Jan 17 '17 at 10:48
it does not let me to write here all codes but basically two viewcontroller one of them has two button one navigate the second viewcontroller the other one is to create another button dynamically. second viewcontroller has one button to return back to previous viewcontroller – Alex Guba Jan 17 '17 at 11:01
It crashes here? `btn.frame = CGRectMake(10, 10, 50, 50) //set frame` – Vyacheslav Jan 17 '17 at 11:06
try to debug and write here the line where it crashes – Vyacheslav Jan 17 '17 at 11:06
I can try this: – Vyacheslav Jan 17 '17 at 11:06
`btn = UIButton(type: .system)` or `btn = UIButton(frame:.zero)` – Vyacheslav Jan 17 '17 at 11:07
I fixed the bug but if i comeback back the page again dynamic button disappears. – Alex Guba Jan 17 '17 at 13:44
@AlexGuba , please, understand me. It is not possible to find your bug without your code. The code your shown works as expected – Vyacheslav Jan 17 '17 at 13:56
Thank you it works! If it was open 3 pages like this, how to return from third page to first page without passing second page same way? – Alex Guba Jan 19 '17 at 11:02
1

@AlexGuba , confirm if it was helpful – Vyacheslav Jan 19 '17 at 11:04
Thank you it was helpful to go first page. Is there any command to go any page? lets say page2 if it exist four page? – Alex Guba Jan 19 '17 at 11:17
@AlexGuba , you can setup 'complition' callback in function I wrote. That is, completion: nil) >>>> completion: {/*your callback code*/}) – Vyacheslav Jan 19 '17 at 11:18
You mean like this ? self.view.window!.rootViewController?.dismissViewControllerAnimated(false, completion: {performSegueWithIdentifier("second", sender: self) }) – Alex Guba Jan 19 '17 at 11:22
As i understand navigation between pages should be hierarchical only you can dismiss the pages on the que without animation. There is no direct way to pass any page like go page3 or page9 directly for one viewcontroller generated – Alex Guba Jan 19 '17 at 11:35
@AlexGuba in brief yes. You can directly close unwanted pages, but, imho, this is not a good practise – Vyacheslav Jan 19 '17 at 11:36
@AlexGuba , i've answered to your several questions. so, approve the answer. – Vyacheslav Jan 19 '17 at 13:49

Swift dynamic button create

1 Answers1