Random photos in 12 views – Fatal error: Index out of range - arrays

Question

I've got Thread 1: Fatal error: Index out of range looping my 7 photos from array in NSViews.
How to fix it?
let url = URL(fileURLWithPath: NSHomeDirectory()).appendingPathComponent("Desktop/ArrayOfElements")
do {
let fileURLs = try FileManager.default.contentsOfDirectory(at: url, includingPropertiesForKeys: nil, options: [.skipsHiddenFiles]).reversed()
let photos = fileURLs.filter { $0.pathExtension == "jpg" }
for index in photos {
let image = [NSImage(data: try Data(contentsOf: index))]
for view in arrayOfViews {
let i = Int(arc4random_uniform(UInt32(photos.count-1)))
view.image = image[i]
}
}
} catch {
print(error)
}

Answer 1

It seems that this line is wrong:
view.image = image[i]
image array has length = 1
Use view.image = image[0] instead
EDIT
let url = URL(fileURLWithPath: NSHomeDirectory()).appendingPathComponent("Desktop/ArrayOfElements")
do {
let fileURLs = try FileManager.default.contentsOfDirectory(at: url, includingPropertiesForKeys: nil, options: [.skipsHiddenFiles]).reversed()
let photos = fileURLs.filter { $0.pathExtension == "jpg" }
for view in arrayOfViews {
let i = Int(arc4random_uniform(UInt32(photos.count-1)))
let image = NSImage(data: try Data(contentsOf: photos[i]))
view.image = image
}
} catch {
print(error)
}

Answer 2

Try to create a category to Collection
extension Collection where Index == Int {
/**
Gives a random element of the collection.
- returns: A random element of the collection.
*/
func randomElement() -> Iterator.Element? {
return isEmpty ? nil : self[Int(arc4random_uniform(UInt32(endIndex)))]
}
}
Usage
let numbers = [1,2,3,4,5,6,7,8,9,10]
let randomNumber = numbers.randomElement()
print(randomNumber!)
Edit:
I guess you are making mistake in the following code
for view in arrayOfViews {
let i = Int(arc4random_uniform(UInt32(photos.count-1)))
view.image = image[i]
}
Let's assume photos objects having 10 elements and image object have less than 10 elements, so in such case, you will get this type of error. So change it to the following
for view in arrayOfViews {
let i = Int(arc4random_uniform(UInt32(image.endIndex)))
view.image = image[i]
}