即使按钮不在后台快速运行，如何禁用按钮? [英] How to disable a button even when it is not running in the background in swift?

问题描述

当我说不在后台运行时，我的意思是当用户双击他们的主页按钮并向上滑动时，该按钮将重新启用

When I say not running in the background, I mean when the user double clicked their home button and swipes up, the button will reenable

这是我的viewDidLoad

if let waitingDate:Date = UserDefaults.standard.value(forKey: "waitingDate") as? Date
    {
        let currentDate = Date()

        if(currentDate.compare(waitingDate) == ComparisonResult.orderedDescending)
        {
            getPointsOutlet.isEnabled = true
        }
    }

这是@IBAction func

getPointsOutlet.isEnabled = false

let newDate = Calendar.current.date(byAdding: .day, value: 1, to: Date())

UserDefaults.standard.setValue(newDate, forKey: "waitingDate")

推荐答案

要获取值，请始终检查使用 guard 或 if let 语句以防止崩溃:-

To get the value always check use guard or if let statement to prevent the crash:-

//Set value in user default 
UserDefaults.standard.set(Date(), forKey:"date")
UserDefaults.standard.synchronize()

//Get value from user default 
guard let value = UserDefaults.standard.object(forKey: "date") as? Date else {return}
print(value)

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