Swift: How to use buttons in Scroll View - ios

Question

I have created a scroll view with "buttons". But the "buttons" actually don't do anything at the moment. So, I would like to know, how I can make the "buttons" usable. So when I press them they lead me to a different view controller. All the buttons will lead me to the same view controller just with different data (depending on what I want that button to represent) inside the view controller. Here's my code so far:
#IBOutlet weak var categoryScrollView: UIScrollView!
var categoryArr = ["Button1","Button2","Button3","Button4","Button5", "Button 6", "Button 7", "Button 8", "Button 9", "Button 10", "Button 11", "Button 12"]
var buttonColors = [UIColor.greenColor(), UIColor.blueColor(), UIColor.blackColor(), UIColor.cyanColor(), UIColor.magentaColor(), UIColor.greenColor(), UIColor.blueColor(), UIColor.blackColor(), UIColor.cyanColor(), UIColor.magentaColor(), UIColor.blackColor(), UIColor.brownColor()]
let kPadding:CGFloat = 20
override func viewDidLoad() {
super.viewDidLoad()
let buttonSize = CGSizeMake(categoryScrollView.bounds.size.width/2, categoryScrollView.bounds.size.height/2)//hal
let scrollingView = colorButtonsView(buttonSize, buttonCount: 12)
categoryScrollView.contentSize = scrollingView.frame.size
categoryScrollView.addSubview(scrollingView)
categoryScrollView.showsVerticalScrollIndicator = false
categoryScrollView.delegate = self
categoryScrollView.pagingEnabled = true
categoryScrollView.indicatorStyle = .Default
categoryScrollView.contentOffset = CGPointMake(0, 0)
}
func colorButtonsView(buttonSize:CGSize, buttonCount:Int) -> UIView {
let buttonView = UIView()
buttonView.frame.origin = CGPointMake(50,300)
let padding = CGSizeMake(kPadding, kPadding)
buttonView.frame.size.width = (buttonSize.width + padding.width) * CGFloat(buttonCount)
var buttonPosition = CGPointMake(0, padding.height)
let buttonIncrement = buttonSize.width + padding.width
for i in 0...(buttonCount - 1) {
let button = UIButton(type: .Custom)
button.frame.size = buttonSize
button.frame.origin = buttonPosition
buttonPosition.x = buttonPosition.x + buttonIncrement
button.setTitle(categoryArr[i], forState: UIControlState.Normal)
button.backgroundColor = buttonColors[i]
buttonView.addSubview(button)
}
buttonView.backgroundColor = UIColor.redColor()
return buttonView
}
}
extension ViewController:UIScrollViewDelegate{
func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
let index = round(scrollView.contentOffset.x / scrollView.frame.size.width)
print(index)
}
}

Answer 1

When you create your button you have to specify a target in order to have an action with it (add this in your for loop) :
button.addTarget(self, action: "myaction:", forControlEvents: .TouchUpInside)
then create the corresponding method
func myaction(sender: UIButton!) {
// navigation code here.
}
Please note that you don't have to create several method in order to have different actions for each button, all you have to do is something like this :
button.tag = i
and then in your action method :
switch sender.tag {
case 0 :
//do some stuff
case 1 :
//do some stuff
}

Answer 2

You have to add targets to button to fire some action methods. Like in your loop when you create UIButton, add
button.addTarget(self, action: "pressed:", forControlEvents: .TouchUpInside)
and implement one method like:
func pressed(sender: UIButton!) {
// navigation code here.
}