Xcode repetitive falling images - ios

Question

I'm making a game that involves falling images. I have 6 images and I want each one to fall randomly (ex. The $1 bill will be falling and then a $5 bill (or whatever randomly generated image) falling either beside it or right behind it (The iOS game Sky Burger by: NimbleBit LLC or Crazy Goats by: Barry Calvagna are a couple of examples)). Can anybody help me? This is all the code I have so far
-(void)moneyDrop {
money.animationImages = [NSArray arrayWithObjects:
[UIImage imageNamed:#"$1 (bill).png"],
[UIImage imageNamed:#"$5 (bill).png"],
[UIImage imageNamed:#"$20 (bill).png"],
[UIImage imageNamed:#"$50 (bill).png"],
[UIImage imageNamed:#"$100 (bill).png"],nil]; }
I have not necessarily worked with falling image, unless you count a Flappy Bird remake or a Ball Pong game, so please excuse the lack of code. If my question doesn't make any since, I will re-word it.

Answer 1

First off, it sounds to me like you want multiple UIImageViews each with a different image, not a single UIImageView with an array of animationImages.
For making things move, you can use NSTimer.
- (void)start {
mainTimer = [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:#selector(mainTimerLoop) userInfo:nil repeats:YES];
}
- (void)mainTimerLoop {
NSLog(#"Loop");
//In here, you can assign random images to and adjust the centers of money image views.
}
You could make a function like this to return an image.
- (UIImage *)moneyImageForRandomInt:(int)random {
if (random == 0) return [UIImage imageNamed:#"$1 (bill).png"];
if (random == 1) return [UIImage imageNamed:#"$5 (bill).png"];
if (random == 2) return [UIImage imageNamed:#"$20 (bill).png"];
if (random == 3) return [UIImage imageNamed:#"$50 (bill).png"];
return [UIImage imageNamed:#"$100 (bill).png"];
}
And use a function like this to assign a random image to a UIImageView.
- (void)assignRandomImageToMoneyImageView:(UIImageView *)moneyImageView {
moneyImageView.image = [self moneyImageForRandomInt:arc4random() % 5];
}
This is how I would go about it, anyway.