如何快速从文件夹中获取随机图像？

Question

So far I have created a folder of images and I am able to assign 1 of the images to a UIImageView .

But what I want to do now is create a random generator, that will pick a random image from the folder, so if I was to create a button, I could display all of the images separately and randomly on a single UIImageView .

However, this folder is going to have more than 100 images, so I don't want to hard code each one into an array. Also, the names of the image has to be unique to the image itself.

I have been searching online but cannot find information on how to code what will suit my needs. So how would I get and display a random image(s) from a folder in swift?

Answer 1

You can name your images like this

image_0
image_1
image_2

Then use this code to populate your UIImageView

let numberOfImages: UInt32 = 100
let random = arc4random_uniform(numberOfImages)
let imageName = "image_\(random)"
imageView.image = UIImage(named: imageName)

Update

Since you don't want to rename your images you can create a plist file (type Array) where you put all the names of your images

And finally

func loadRandomImage() {
    let path = NSBundle.mainBundle().pathForResource("Images", ofType: "plist")!
    let names = NSArray(contentsOfFile: path) as! [String]
    let random = Int(arc4random_uniform(UInt32(names.count)))
    let imageName = names[random]
    imageView.image = UIImage(named: imageName)
}

Answer 2

You either need to create an array of string filenames and pick a random filename from the array, or you need to use the file manager ( NSFileManager ) to get a list of the files in your folder and then pick from THAT array. Nether is very difficult.