How to stop animating back in swift? - ios

Question

When I start typing in uitextfield i want some animation to happen and it should not reverse back until i finish typing. I am using this code to animate:
func textFieldDidBeginEditing(textField: UITextField) {
println("begin")
UIView.animateWithDuration(1.0, animations:{
self.secondTextfield.frame = CGRectMake(self.secondTextfield.frame.origin.x + 500, self.secondTextfield.frame.origin.y, self.secondTextfield.frame.size.width, self.venueTextField.frame.size.height)
})
}
What I want to do is: when i start typing in first textfield, i want the second text field to hide out from view and when i finish typing, i want it to animate back in.
What my issue is: When I start typing the animation happens and it comes back to the original position.It doesn't wait for me to finish typing.

Answer 1

Why not change alpha to 0, intead change its frame?
You need to identify witch textfield is editing.
You need to deal with textFieldDidEndEditing to get second textField back.
Example:
func textFieldDidBeginEditing(textField: UITextField) {
if textField == firstTextField {
UIView.animateWithDuration(1.0, animations:{
self.secondTextfield.alpha = 0
})
}
}
func textFieldDidEndEditing(textField: UITextField) {
if textField == firstTextField {
UIView.animateWithDuration(1.0, animations:{
self.secondTextfield.alpha = 1
})
}
}

Answer 2

While not knowing exactly what the problem is, I've found a reasonable alternative to solving your problem:
Instead of animating your frame, animate the auto-layout constraint that defines your textField's x coordinate. For instance, the image below consists of two textFields. I want to animate the bottom one when I begin typing in the top one:
The vertical constraint is a centre x alignment that I want to animate. To achieve the effect, I connected an #IBOutlet to my NSLayoutConstraint:
I had my view controller adopt UITextFieldDelegate and implemented three methods:
extension ViewController: UITextFieldDelegate {
func textFieldDidBeginEditing(textField: UITextField) {
self.c.constant += 100 //c is my constraint
UIView.animateWithDuration(1.0) {
self.view.layoutIfNeeded()
}
}
func textFieldDidEndEditing(textField: UITextField) {
println("textFieldDidEndEditing")
self.c.constant -= 100
UIView.animateWithDuration(1.0) {
self.view.layoutIfNeeded()
}
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
a.resignFirstResponder()
return true
}
}
This method needs a bit of auto-layout know how, but I was able to achieve the effect you desired.