how to iterate through functions with button press in Swift - ios

Question

I'm learning swift and building an ARApp but can't seem to understand how to iterate through a few functions with every separate button press. I have created 3 func with animation built in and want to press the button once and funcAnimation#1 activate then tap button again to proceed to funcAnimation#2 and so forth.
#IBAction func nextAnimation(_ sender: UIButton) {
funcAnimation#1()
funcAnimation#2()
funcAnimation#3()
}
of course the problem here is that they all activate at once. I would like to iterate only on button press for each individual press. In addition I would also like to have a backButton that reverses the current animation to previous animation. I read in Apple's documentation that there is a addTarget method but I don't understand how it works or how to implement it. Please Help!

Answer 1

Your code should like this :
// You can define this variable globally...
var counter = 0
#IBAction func nextAnimation(_ sender: UIButton) {
if (counter == 0) {
funcAnimation1()
// Increase counter count by 1 and you can add this line to completion of animation.
// You can also disable your button interaction until your animation gets complete and that way you can handle your UI
count += 1
}
else if (counter == 1) {
funcAnimation2()
// Increase counter count by 1 and you can add this line to completion of animation.
count += 1
}
else if (counter == 2) {
funcAnimation3()
// set your counter to 0 again to loop through your animation.
counter = 0
}
}
Your Back Action should look like this:
#IBAction func backAnimation(_ sender: UIButton) {
if (counter == 0) {
funcAnimation1()
// set your counter to 2 again to loop through your animation.
count = 2
}
else if (counter == 1) {
funcAnimation2()
// decrease counter count by 1 and you can add this line to completion of animation.
// You can also disable your button interaction until your animation gets complete and that way you can handle your UI
count -= 1
}
else if (counter == 2) {
funcAnimation3()
// decrease counter count by 1 and you can add this line to completion of animation.
count -= 1
}
}

Answer 2

Another way!
Just set tag of button 1 (Ex. btnObj.tag=1)
And manage method(s) in action of the button like
My suggestion is also manage flag for animation like if 1st animation is in process then 2nd will be waiting for finish and after finishing 1st animation, button will be clicked so your animation will not mismatch.
var isAnimated = false;
#IBAction func myAnimationMethod(_ sender: UIButton) {
if isAnimated {return} // Or display appropriate message by alert
if (sender.tag == 1) {
isAnimated=true
funcAnimation1(...Your Code... After finish to set isAnimated=false)
sender.tag = 2
}
else if (sender.tag == 2) {
isAnimated=true
funcAnimation2(...Your Code... After finish to set isAnimated=false)
sender.tag = 3
}
else if (sender.tag == 3) {
isAnimated=true
funcAnimation3(...Your Code... After finish to set isAnimated=false)
sender.tag = 1
}
}

Answer 3

You can forward your animations and go back to previous animation state through a back button like this .
Step 1 : Declare two integer type variables
var tapCount = 0 //For forwarding your animations from first to third
var currentAnimation = 0 // For reversing the animation from current animation
Step 2 : In your IBAction Function
#IBAction func nextAnimation(_ sender: Any)
{
if tapCount == 0
{
if currentAnimation == 1
{
Animation2()
}
else
{
Animation1()
}
tapCount += 1
}
else if tapCount == 1
{
if currentAnimation == 2
{
Animation3()
}
else
{
Animation2()
}
tapCount += 1
}
else if tapCount == 2
{
if currentAnimation == 3
{
Animation1()
}
else
{
Animation3()
}
tapCount = 0
}
}
Step 3 : In your functions
func Animation1() {
currentAnimation = 1
print("First Animation")
}
func Animation2() {
currentAnimation = 2
print("Second Animation")
}
func Animation3() {
currentAnimation = 3
print("third Animation")
}
Step 4: Lastly For Reversing the animation from current state
#IBAction func backAnimation(_ sender: Any)
{
if currentAnimation == 2
{
Animation1()
}
else if currentAnimation == 3
{
Animation2()
}
else
{
}
tapCount = 0
}
Hope it helps !!
For addTarget(_:action:for:) method , this can be done without connecting a IBAction and declaring it in viewWillAppear or viewDidLoad as required.It will Associates a target object and action method with the control.
For example :
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
nextButton.addTarget(self, action: #selector(self. nextAnimation), for: .touchUpInside) //Declared outlet as nextButton
backButton.addTarget(self, action: #selector(self. backAnimation), for: .touchUpInside) //Declared outlet as backButton and this adds a target
}
#objc func nextAnimation(sender: UIButton) {
// Do your stuff for next animation
}
#objc func backAnimation(sender: UIButton) {
// Do your stuff for previous animation
}