如何在屏幕上交换文本字段位置 - Swift

Question

I have two UITextFields and want to swap their position when a button is clicked. Perhaps also animate the swap.

ie:

textFieldOne & textFieldOne are positioned with AutoLayout using Interface Builder.

On Button Click

• Get textFieldOne position parameters,
• Get textFieldTwo position parameters
• Set textFieldOne position parameters to textFieldTwo,
• Set textFieldTwo position parameters to textFieldOne

Answer 1

To simply swap positions of your UITextField 's you can assign their origin values to each other.

// Store textFieldOne's postition
let tempPos : CGPoint = textFieldOne.frame.origin
UIView.beginAnimations(nil, context: nil)
// Set textFieldOne to textFieldTwo's position
textFieldOne.frame.origin = textFieldTwo.frame.origin
// Set textFieldTwo to textFieldOne's original position
textFieldTwo.frame.origin = tempPos
UIView.commitAnimations()

Or, for a more Swift way of doing things you can use a Tuple to swap the values without the need for any temporary variables.

UIView.beginAnimations(nil, context: nil)
(textFieldOne.frame.origin, textFieldTwo.frame.origin) = (textFieldTwo.frame.origin, textFieldOne.frame.origin)
UIView.commitAnimations()

Answer 2

In the function that receive the button click you will need to save the position of each button and transfer the other:

Swap position:

let positionButton1 = button1.frame.origin
let positionButton2 = button2.frame.origin

button1.frame.origin = positionButton2
button2.frame.origin = positionButton1

Swap positions and size:

let positionButton1 = button1.frame
let positionButton2 = button2.frame

button1.frame = positionButton2
button2.frame = positionButton1