class imageFile  {
    var fileName = String()
    var fileID = Int()
}

很多他们存储在Array

var images : Array = []

var aImage = imageFile()
aImage.fileName = "image1.png"
aImage.fileID = 101
images.append(aImage)

aImage = imageFile()
aImage.fileName = "image1.png"
aImage.fileID = 202
images.append(aImage)

问题是：我怎么可以通过’fileID’ASC或DESC排序图像数组？