1. 顏色適配

2.圖片適配

@available(iOS 13.0, *)
    public init(dynamicProvider: @escaping (UITraitCollection) -> UIColor)

self.view.backgroundColor = UIColor(dynamicProvider: { (coll) -> UIColor in
  if coll.userInterfaceStyle == .dark {
       return UIColor.red
  } else {
        return UIColor.blue
      }
})

又新增一個(gè)UITraitCollection方法,我們可以通過(guò)它來(lái)判斷當(dāng)前系統(tǒng)的模式

open class UITraitCollection : NSObject, NSCopying, NSSecureCoding {...}

UIView UIViewControlelr UIScreen UIWindow都遵從UITraitEnvironment協(xié)議

public protocol UITraitEnvironment : NSObjectProtocol {
    @available(iOS 8.0, *)
    var traitCollection: UITraitCollection { get }
}

UIUserInterfaceStyle是個(gè)枚舉有3種模式

public enum UIUserInterfaceStyle : Int {
    case unspecified
    case light
    case dark
}

在協(xié)議中有一個(gè)traitCollection屬性判斷當(dāng)前處于哪種模式

1.
let style = self.traitCollection.userInterfaceStyle
 switch style {
        case .dark:
            print("黑暗模式")
        case .light:
            print("亮模式")
        case .unspecified:
            print("未指定")
        default:
            break
}
2.
let collection = UITraitCollection.current

如果我們不想適配黑暗模式，全局關(guān)閉黑暗模式在Info.plist文件中，添加key為 User Interface Style，value設(shè)置為Light即可關(guān)閉

關(guān)閉單個(gè)頁(yè)面或試圖的黑暗模式只需設(shè)置overrideUserInterfaceStyle指定模式

self.overrideUserInterfaceStyle = .dark

如果希望一個(gè)子視圖監(jiān)聽(tīng)系統(tǒng)的模式，要將overrideUserInterfaceStyle 設(shè)置成.unspecified

圖片適配

QQ20190921-204412.png