I have
var images: [NSData] = [];
and I need to add empty values into this array during executing of my for-loop block and then replace these empty values on NSData of the images I downloaded from the server.
How should I append an empty value to NSData-array?
I tried some like ... as! NSData, or create variable someVar: NSData? - app crashes every time
Create an empty Data (NSData in Swift 2) instance and append it to the array
var images: [Data] = []
let emptyData = Data()
images.append(emptyData)
Make an array of optionals var images: [NSData?] = [];
And add nil values when in for-loop images.append(nil)
After that replace with your real data if you know position in array
You could have your array be optional NSData like so:
var images: [NSData?] = [];
That way, you can set nil if you want:
images.append(nil)
And check on the loop:
for imageData in images {
if let data = imageData {
// data exists
} else {
// data doesn't exist yet at this index
}
}
