Selector method of UIButton not called during animation - ios

Question

I have dynamically created buttons on a dynamic view and later I add that dynamic view to main view.
Everything is working well except that the selector method of UIButton is not called.
var baseView:UIView?
override func viewDidLoad() {
super.viewDidLoad()
randomizeButtons()}
func randomizeButtons(){
baseView = UIView(frame:CGRectMake(view.bounds.origin.x + 10, view.bounds.origin.y + 50, view.bounds.size.width, view.bounds.size.height-20))
let viewWidth = baseView.bounds.size.width;
let viewHeight = baseView.bounds.size.height;
baseView.userInteractionEnabled = true
let i = GlobalArrayofUsers.count
var loopCount = 0
while loopCount < i{
let userBaseView = UIView(frame: CGRectMake(abs(CGFloat(arc4random()) % viewWidth - 90) , abs(CGFloat(arc4random()) % viewHeight - 120), 90, 90))
print(userBaseView.frame)
userBaseView.backgroundColor = UIColor.redColor()
userBaseView.userInteractionEnabled = true
userBaseView.layer.cornerRadius = 45
userBaseView.clipsToBounds = true
let button = UIButton(frame: userBaseView.bounds)
button.backgroundColor = UIColor.greenColor()
button.showsTouchWhenHighlighted = true
button.addTarget(self, action: #selector(ViewController.handleTapEventofBtn(_:)), forControlEvents: .TouchUpInside)
button.setTitle("hello", forState: .Normal)
button.userInteractionEnabled = true
userBaseView.addSubview(button)
baseView.addSubview(userBaseView)
print("button frame is\(button.frame)")
baseView.bringSubviewToFront(userBaseView)
loopCount += 1
}
}
baseView.subviews.forEach { (users) in
UIView.animateWithDuration(1, delay: 0, options: [.Autoreverse,.Repeat], animations: {
users.center.y += 10
}, completion: nil)
}
view.insertSubview(baseView, atIndex: view.subviews.count)
}
func handleTapEventofBtn(sender: UIButton!) {
// handling code
}
Any idea why my selector method is not called? It is due to animation. How can i handle it.
SOLUTION: Allow userinteraction in UIAnimationOptions

Answer 1

The problem is that you are trying to click an object that is being animated. From the docs:
During an animation, user interactions are temporarily disabled for
the views being animated. (Prior to iOS 5, user interactions are
disabled for the entire application.)
But worry not, the solution is very easy, just call your animation with the option .AllowUserInteraction. For example (with your code):
UIView.animateWithDuration(1, delay: 0, options: [.Autoreverse,.Repeat,.AllowUserInteraction], animations: {
users.center.y += 10
}, completion: nil)

Answer 2

Have you tried this way:
for _ in 0...5{
// generate new view
let userBaseView = UIView(frame: CGRectMake(abs(CGFloat(arc4random()) % viewWidth - 90) , abs(CGFloat(arc4random()) % viewHeight - 120), 90, 90))
userBaseView.backgroundColor = UIColor.redColor()
// add button to view
let button = UIButton(frame: userBaseView.bounds)
button.backgroundColor = UIColor.yellowColor()
button.showsTouchWhenHighlighted = true
button.addTarget(self, action: #selector(self.handleTapEventofBtn(_:)), forControlEvents: .TouchUpInside)
button.setTitle("hello", forState: .Normal)
userBaseView.addSubview(button)
}
self.view.addSubview(userBaseView)
All you need is to create userBaseView before cycle, then create buttons in cycle and add them to userBaseView, after that just add userBaseView to self.view or where you need to add it. In your example you create userBaseView in every iteration of the loop.
I think the problem could be here:
userBaseView.addSubview(button)
// add new view containing button to self.view
self.view.addSubview(userBaseView)
}
userBaseView.addSubview(button)
baseView.addSubview(userBaseView)
First you add userBaseView to self.view in the loop:
// add new view containing button to self.view
self.view.addSubview(userBaseView)
then add it to baseView:
baseView.addSubview(userBaseView)
Can you post how it looks like in IB?

Answer 3

The action has a parameter so the selector signature is actually takeActionBtn:
(note the colon at the end).
You need to change that or the button will try to call a version of the function with no parameter which doesn't exist.
button.addTarget(self, action: "button:",forControlEvents: UIControlEvents.TouchUpInside)
func button(sender: UIButton!) {
// handling code
print("1")
}

Answer 4

// hi. your problem is in the selector line. try this:
for _ in 0...5 {
// generate new view
let userBaseView = UIView(frame: CGRectMake(abs(CGFloat(arc4random()) % self.view.frame.size.width - 90) , abs(CGFloat(arc4random()) % self.view.frame.size.height - 120), 90, 90))
userBaseView.backgroundColor = UIColor.redColor()
// add button to view
let button = UIButton(frame: userBaseView.bounds)
button.backgroundColor = UIColor.yellowColor()
button.showsTouchWhenHighlighted = true
button.addTarget(self, action: "buttonAction", forControlEvents: UIControlEvents.TouchUpInside)
button.setTitle("hello", forState: .Normal)
userBaseView.addSubview(button)
self.view.addSubview(userBaseView)
}
// tested with xcode 7.2
func buttonAction() {
print("working")
}