以下代码会在这一行生成此问题标题中显示的错误:for (index, image) in (backgroundImages) {
有人可以建议如何消除这个错误
init!(backgroundImages:[UIImage], size:CGSize, scrollingDirection:ScrollingDirection, startingSpeed:CGFloat, speedDecreaseFactor:CGFloat) {
self.backgrounds = []
self.clonedBackgrounds = []
self.speeds = []
self.numberOfBackgrounds = (backgroundImages.count)
self.scrollingDirection = scrollingDirection
super.init(texture: nil, color:UIColor.clear, size: size)
let zPos = 1.0 / CGFloat(numberOfBackgrounds)
var currentSpeed = startingSpeed
self.position = CGPoint(x:self.size.width/2, y:self.size.height/2)
self.zPosition = -100
for (index, image) in (backgroundImages) {
let background = SKSpriteNode(texture: SKTexture(CGImage: image.CGImage), size:size)
background.zPosition = self.zPosition - (zPos + (zPos * CGFloat(index)))
background.position = CGPoint(x:0,y:0)
let clonedBackground = background.copy() as! SKSpriteNode
var clonedBackgroundX = background.position.x
var clonedBackgroundY = background.position.y
switch (scrollingDirection) {
case .Right:
clonedBackgroundX = -background.size.width
case .Left:
clonedBackgroundX = background.size.width
default:
break
}
最佳答案
你的意思可能是 for (index, image) in backgroundImages.enumerated()
编译器不知道如何将 backgroundImages
的元素解构为 (index, image)
。
关于swift - 表达式类型 UIImage 在没有更多上下文的情况下不明确,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46496029/