无法将专辑插图设置为背景色

Question

我使用MPMediaItemArtwork拉取了所选歌曲的album artwork image，我正在尝试将此艺术品设置为图像background类似于spotify设置的方式，但是我不断收到两个错误

无法将"UIColor"类型的值分配给值"UIColor"的类型？

以及

找不到接受提供的"init"的重载 参数

这是我下面的代码

func setAlbumCover(){
   var AlbumImage = MPMediaItemArtwork()
    self.view.backgroundColor = UIColor(patternImage: UIImage(named: AlbumImage)!)
    if !UIAccessibilityIsReduceTransparencyEnabled() {
        self.view.backgroundColor = UIColor.clearColor()
        let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.ExtraLight)
        let blurEffectView = UIVisualEffectView(effect: blurEffect)
        blurEffectView.frame = self.view.bounds
        self.view.addSubview(blurEffectView) //if you have more UIViews on screen, use insertSubview:belowSubview: to place it underneath the lowest view instead
        //add auto layout constraints so that the blur fills the screen upon rotating device
        blurEffectView.setTranslatesAutoresizingMaskIntoConstraints(false)
        self.view.addConstraint(NSLayoutConstraint(item: blurEffectView, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Top, multiplier: 1, constant: 0))
        self.view.addConstraint(NSLayoutConstraint(item: blurEffectView, attribute: NSLayoutAttribute.Bottom, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Bottom, multiplier: 1, constant: 0))
        self.view.addConstraint(NSLayoutConstraint(item: blurEffectView, attribute: NSLayoutAttribute.Leading, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Leading, multiplier: 1, constant: 0))
        self.view.addConstraint(NSLayoutConstraint(item: blurEffectView, attribute: NSLayoutAttribute.Trailing, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Trailing, multiplier: 1, constant: 0))
    } else {
        self.view.backgroundColor = UIColor.whiteColor()
    }
}

我知道我可能有一些愚蠢的错误，但我无法弄清楚

Answer 1

您通过调用需要字符串的UIImage(named:)来创建UIImage，并且您正在传入MPMediaItemArtwork实例。这将编译：

let albumArtwork = MPMediaItemArtwork()
let size = CGSize(width: 250, height: 250)
let image = albumArtwork.imageWithSize(size)
self.view.backgroundColor = UIColor(patternImage: image!)

另请注意，您设置了背景颜色，然后在几行之后更改了它，因此图像将不会显示：

self.view.backgroundColor = UIColor(patternImage: image!)
if !UIAccessibilityIsReduceTransparencyEnabled() {
    self.view.backgroundColor = UIColor.clearColor()
    // ... some more code ....
} else {
    self.view.backgroundColor = UIColor.whiteColor()
}