Question

我的iOS应用中有一个提醒，警报上有两个按钮。我想调用我的函数，当用户选择该选项时调用searchTheWeb（）：

alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.default, handler: nil))
alert.addAction(UIAlertAction(title: "Search The Web!", style: UIAlertActionStyle.default, handler: nil))

func searchTheWeb(){
    let word =  self.userInfo.text! + self.faceResults.text!  + self.labelResults.text!
    if let encoded = word.addingPercentEncoding(withAllowedCharacters: .urlFragmentAllowed), let url = URL(string: "https://www.google.com/#q=\(encoded)") {
        if #available(iOS 10.0, *) {
            UIApplication.shared.open(url, options: [:], completionHandler: nil)
        } else {
            UIApplication.shared.openURL(url)
        }
    }
}

所以在addAction中标题为Search The Web！我怎么称呼这个功能？

Answer 1

您只需要更改将searchTheWeb操作声明为以下内容的方式：

let search = UIAlertAction(title: "Search The Web!", style: .default) { [weak self] _ in
    self?.searchTheWeb()
}
alert.addAction(search)

Answer 2

使用警报处理程序

 alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.default, handler: nil))

let search = UIAlertAction(title: "Search The Web!", style: UIAlertActionStyle.default, handler: { (action) -> Void in
    self.searchTheWeb()
})
alert.addAction(search)

func searchTheWeb(){
    let word =  self.userInfo.text! + self.faceResults.text!  + self.labelResults.text!
    if let encoded = word.addingPercentEncoding(withAllowedCharacters: .urlFragmentAllowed), let url = URL(string: "https://www.google.com/#q=\(encoded)") {
        if #available(iOS 10.0, *) {
            UIApplication.shared.open(url, options: [:], completionHandler: nil)
        } else {
            UIApplication.shared.openURL(url)
        }
    }
}

从UIAlertController

2 个答案: