SIGABRT error when using NSTimer, Swift 2 Xcode 7 - ios

Question

I have a function that flashes a button. The function is inside a for i loop, which is in the viewDidLoad function. I also have an NSTimer that calls the function repeatedly flashing a different button each time. However I am getting a SIGABRT error when I run this. If you are going to ask, I have made sure that the connections with my buttons are solid, no cut off connections.
var computerChoices = [Int](count: 11, repeatedValue: 0)
var randomIndex = 0
var pcChoice = 0
var lit = [b0o,b1o,b2o,b3o,b4o,b5o,b6o,b7o,b8o]
var litIndex = 0
override func viewDidLoad() {
super.viewDidLoad()
for i in 1...10{
print(randomIndex)
print(computerChoices)
var buttonChoice = lit[randomIndex]
randomIndex = Int(arc4random_uniform(UInt32(lit.count)))
computerChoices[i] = randomIndex
print("yoyoyo")
func flashingButtons(){
var one = computerChoices[pcChoice]
lit[one].setImage(UIImage(named: "redb.png"), forState: UIControlState.Normal)
pcChoice += 1
}
timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("flashingButtons"), userInfo: nil, repeats: true)
}
}

Answer 1

Put out the flashingButtons function out of the viewDidLoad. The timer find the function and couldn't find it if it is embedded.
override func viewDidLoad() {
super.viewDidLoad()
for i in 1...10{
print(randomIndex)
print(computerChoices)
var buttonChoice = lit[randomIndex]
randomIndex = Int(arc4random_uniform(UInt32(lit.count)))
computerChoices[i] = randomIndex
print("yoyoyo")
timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("flashingButtons"), userInfo: nil, repeats: true)
}
}
func flashingButtons(){
var one = computerChoices[pcChoice]
lit[one].setImage(UIImage(named: "redb.png"), forState: UIControlState.Normal)
pcChoice += 1
}

Answer 2

You should put flashingButtons() out side viewDidLoad. And in it you make sure that out of range don't happen because pcChoice increase over time.
func flashingButtons(){
var one = computerChoices[pcChoice]
lit[one].setImage(UIImage(named: "redb.png"), forState: UIControlState.Normal)
if pcChoice >= 10 {
pcChoice = 0
return
}
pcChoice += 1
}