Can not create UIImage and append it to array

Question

I have string array of file names, which looks like this

["xBGEx.jpg", "OgJuM.jpg"]

This is images, which saved to documents directory. I try to create array of UIImages by appending full path in for look and then appending to array.

In my appDelegate I have code in didFinishLaunchingWithOptions it looks like

    var paths:[AnyObject] = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
    var documentsDirectory = paths[0] as? String
    self.documentsRoot = documentsDirectory! + "/"

Then, when Im in controller, which I need I do the following

var slider = ["xBGEx.jpg", "OgJuM.jpg"]
var UIImageArray = [UIImage]()

for element in imgArray {
        var path = "\(appDelegate.documentsRoot!)" + "\(element)"
        var obj:UIImage = UIImage(contentsOfFile: path)!
        UIImageArray.append(obj)
    }

imageArray = UIImageArray

but when I build I have nil error in the moment of appending

What am I doing wrong ?

NSSearchPathForDirectoriesInDomains returns an non-optional [String], any casting and optional binding is not needed at all. Apart from that I recommend the URL related API of NSFilemanager and the designated methods to append path components. — vadian
– vadian, Commented Oct 22, 2015 at 10:40

Moriya · Accepted Answer · 2015-10-22 10:29:01Z

2

Seems like the path doesn't lead to an image file. You should check if the file you found a path for really is an image and not force the cast with !

for element in imgArray {
    var path = "\(appDelegate.documentsRoot!)" + "\(element)"
    if let obj = UIImage(contentsOfFile: path) {
        UIImageArray.append(obj)
    }   
}

On another note PLEASE don't name your variables with a capital letter uiImageArray would be much better.

edited Oct 22, 2015 at 10:29

answered Oct 22, 2015 at 10:22

Moriya

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