swift - 单击后如何使用 Swift 在 iOS 中启用 Uialertview 特定按钮？

Question

关于按钮清除历史我想启用其他 2 个按钮。我是 iOS 新手。

let alert = UIAlertController(title: "Title", message: nil, preferredStyle: .actionSheet)

    alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
    let markAction = UIAlertAction(title: "Mark as Urgent", style: .default, handler: { (action) in   

    })
     let resolveAction = UIAlertAction(title: "Resolvethe conversion", style: .default, handler: { (action) in

    })
     markAction.isEnabled = false
    resolveAction.isEnabled = false
    alert.addAction(markAction)
    alert.addAction(UIAlertAction(title: "Clear history", style: .default, handler: { (action) in
        alert.actions.map {$0.isEnabled = true}
    }))
    self.present(alert, animated: true, completion: nil)
}

Answer 1

您可以在清除按钮完成处理程序中启用您的操作并再次显示您的警报，因为您无法避免关闭:

let alert = UIAlertController(title: "Title", message: nil, preferredStyle: .actionSheet)
alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
let markAction = UIAlertAction(title: "Mark as Urgent", style: .default, handler: { (action) in

    // TODO: Your action

})

markAction.isEnabled = false
alert.addAction(markAction)
alert.addAction(UIAlertAction(title: "Clear history", style: .default, handler: { (action) in
    alert.actions.map {$0.isEnabled = true}
    self.present(alert, animated: true, completion: nil)
}))

self.present(alert, animated: true, completion: nil)