Swift: Display images linked to a timer and slider - image

Question

I'm new to programming and very new to Swift so am in need of help please.
I want to create a view where images will appear and then disappear from the screen at a specific time. The time will be indicated by a label and also a slider. For example, When 5 seconds is indicated on the the label the image will appear, After 10 seconds on the label, the image will disappear. After 15 seconds another image will appear and so on. This would continue for 60 seconds. This time label would also be connected to the slider. I would like to do this completely in code if possible
Any suggestions as to an efficient way to achieve this would be very much appreciated.

Answer 1

You can use an UIImageView, UILabel, UISlider and NSTimer to achieve this. Make sure you keep the NSTimer instance as a member variable in your ViewController
For example, your viewDidAppear would start the NSTimer with the default interval (lets say 5 seconds):
Your ViewController would look something like this:
import UIKit
class MyViewController : UIViewController
{
// Connect these outlets via InterfaceBuilder
#IBOutlet weak var imageView : UIImageView!
#IBOutlet weak var label : UILabel!
#IBOutlet weak var slider : UISlider!
var timer : NSTimer!
override func viewDidLoad()
{
super.viewDidLoad()
slider.addTarget(self, action: Selector("sliderValueChanged"), forControlEvents: .ValueChanged)
}
override func viewDidAppear(animated: Bool)
{
super.viewDidAppear(animated)
self.startTimerWithInterval(5)
}
func sliderValueChanged()
{
let newValue = slider.value
self.startTimerWithInterval(NSTimeInterval(newValue))
}
func timerDidFire()
{
// Do something with the imageView
}
private func startTimerWithInterval(seconds: NSTimeInterval)
{
if self.timer != nil { self.timer.invalidate() }
self.timer = NSTimer(timeInterval: seconds, target: self, selector: Selector("timerDidFire"), userInfo: nil, repeats: true)
}
}