UIView 背景颜色随时间变化

Question

在我的应用程序中，我希望有一个 UIView 的部分具有随时间变化的颜色。这可能吗，我可以在扩展中做到吗？提前致谢！！

喜欢：
日出到 10 - 颜色
10 比 1 - 颜色
1 到 4 - 颜色
等...

Answer 1

没有神奇的方法可以实现这一点。在某种程度上，您将不得不执行以下操作：

import UIKit

private extension UIColor {

    static func viewBackground(forTime time: Date) -> UIColor {
        let earlyMorningBoundary = Calendar.current.date(bySettingHour: 6, minute: 0, second: 0, of: time)!
        let morningBoundary = Calendar.current.date(bySettingHour: 10, minute: 0, second: 0, of: time)!
        let lunchtimeBoundary = Calendar.current.date(bySettingHour: 13, minute: 0, second: 0, of: time)!
        let afternoonBoundary = Calendar.current.date(bySettingHour: 16, minute: 0, second: 0, of: time)!
        let eveningBoundary = Calendar.current.date(bySettingHour: 19, minute: 0, second: 0, of: time)!
        if time < earlyMorningBoundary {
            return UIColor.earlyMorningColor
        } else if time < morningBoundary {
            return UIColor.morningColor
        } else if time < lunchtimeBoundary {
            return UIColor.lunchtimeColor
        } else if time < afternoonBoundary {
            return UIColor.afternoonColor
        } else {
            return UIColor.eveningColor
        }
    }
}

extension UIView {

    func updateBackgroundForCurrentTime() {
        self.backgroundColor = .viewBackground(forTime: Date())
    }
}

extension UIColor {

    static var earlyMorningColor: UIColor {
        return UIColor(red: 60/255, green: 207/255, blue: 228/255, alpha: 1.0)
    }

    static var morningColor: UIColor {
        return UIColor(red: 5.1/255, green: 25.9/255, blue: 87.5/255, alpha: 1.0)
    }

    static var lunchtimeColor: UIColor {
        return UIColor(red: 0/255, green: 88.2/255, blue: 45.9/255, alpha: 1.0)
    }

    static var afternoonColor: UIColor {
        return UIColor(red: 0/255, green: 64.7/255, blue: 33.7/255, alpha: 1.0)
    }

    static var eveningColor: UIColor {
        return UIColor(red: 49/255, green: 54/255, blue: 57/255, alpha: 1.0)
    }
}

然后您需要弄清楚什么时候应该调用 updateBackgroundForCurrentTime 来更新背景颜色。是在创建视图时吗？当应用程序被带到前台时？你会排队一个本地通知来告诉你更新吗？这完全取决于您认为应用程序会话可能持续多长时间。我会先在应用程序启动或进入前台时更新颜色，然后再从那里开始。

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