如何将图像存储到UIImage数组中（Swift）

Question

Here is my code

self.pages?.photo1.getDataInBackgroundWithBlock {
                (imageData: NSData?, error:NSError?) -> Void in
                if error == nil {
                    let image = UIImage(data: imageData!)
                    println(image!)
                    self.pageImages.append(image!)

when I run a println(pageImages.count) I get a 0 even though I know there are other elements in my dataset (pages)

NOTE: "photo1" is stored in a dictionary as a PFFIle type

and a println(image) displays the following result

UIImage: 0x7f90f3e12df0, {748, 420}}

Answer 1

The problem is that you cannot add an element to an array the way you did.

To add an element at the end, use

pageItems.append(image)

To insert an element at the beginning, use

pageItems.insert(image, atIndex: 0)

The following works as expected in Playground:

var imageArray: [UIImage] = []
let image = UIImage()
imageArray.append(image)
imageArray.insert(image, atIndex: 0)
let x = imageArray.count               // 2