它可以在90％的时间内正常工作但
我在不同情况下提出def recursive_sum(l):
result = 0
for i in l:
if type(i) is list:
result += recursive_sum(i)
elif type(i) is int:
result += i
return result
后出现此错误
由于未捕获的异常而终止应用 'NSInvalidArgumentException'，原因：'应用程序试图呈现 modally一个活动控制器，
以下是自定义alertController
alertController这里是类警报消息中显示的字体函数
class AlertMessage {
private var alertController:UIAlertController!
static let ATTRIBUTED_TITLE = "attributedTitle"
static let ATTRIBUTED_MESSAGE = "attributedMessage"
static let tintColor = UIColor(rgb: 0xFDC32E)
/// setup and configure the font for title
///
/// - Parameter title: the title for alert message
/// - Returns: attributed strings
static func attributed(title:String) -> NSMutableAttributedString{
return NSMutableAttributedString(string: title, attributes: Tools.setFontItemBy(size: 20))
}
/// setup and configure the font for message
///
/// - Parameter message: message for user
/// - Returns: attributed strings
static func attributed(message:String) -> NSMutableAttributedString {
return NSMutableAttributedString(string: message, attributes: Tools.setFontItemBy(size: 15))
}
private init(newTitle:String) {
self.alertController = UIAlertController(title: "", message: "", preferredStyle: .alert)
self.alertController.setValue(AlertMessage.attributed(title:newTitle), forKey: AlertMessage.ATTRIBUTED_TITLE)
self.alertController.view.tintColor = AlertMessage.tintColor
}
convenience init() {
self.init(newTitle: Texts.WARNING)
self.alertController.addAction(UIAlertAction(title:Texts.YES, style: .default, handler: nil))
}
convenience init (title:String){
self.init(newTitle: title)
self.alertController.addAction(UIAlertAction(title: Texts.YES, style: .default, handler: nil))
}
convenience init (title:String, completion:@escaping ((UIAlertAction) -> (Swift.Void))){
self.init(newTitle: title)
self.alertController.addAction(UIAlertAction(title:Texts.YES, style: .default, handler: completion))
}
convenience init (title:String, message:String, completion:@escaping ((UIAlertAction) -> (Swift.Void))){
self.init(newTitle: title)
self.alertController.setValue(AlertMessage.attributed(message:message), forKey: AlertMessage.ATTRIBUTED_MESSAGE)
self.alertController.addAction(UIAlertAction(title:Texts.YES, style: .default, handler: completion))
}
convenience init (title:String,
completionAccept:@escaping ((UIAlertAction) -> (Swift.Void)),
completionRefuse:@escaping ((UIAlertAction) -> (Swift.Void))){
self.init(newTitle: title)
self.alertController.addAction(UIAlertAction(title: Texts.YES, style: .default, handler: completionAccept))
self.alertController.addAction(UIAlertAction(title: Texts.NO, style: .cancel, handler: completionRefuse))
}
/// call this method to set message for user
///
/// - Parameter message: aler message that you want to show to user
func message(message:String)-> AlertMessage{
self.alertController.dismiss(animated: true, completion: nil)
self.alertController.setValue(AlertMessage.attributed(message:message), forKey: AlertMessage.ATTRIBUTED_MESSAGE)
return self
}
/// call this method to show to user the alert message
///
/// - Parameter view: to show to the current view that user in
func show(view:UIViewController){
view.present(self.alertController, animated: true, completion: nil)
}
/// call this method to show to user the alert message and handle an action
///
/// - Parameters:
/// - view: to show to the current view that user in
/// - completion: action handler after message alert shown
func show(view:UIViewController, completion: (() -> Swift.Void)? = nil){
view.present(self.alertController, animated: true, completion: completion)
}
and here how I initialize it in a class called "BaseViewController" that is inherited from every View controller
/// show alert message, need in every view to alert the user about an action
lazy var alert:AlertMessage = self.initAlertMessage()
/// this function needed to setup the alert because the object is lazy
///
/// - Returns: AlertMessage
func initAlertMessage() -> AlertMessage{
return AlertMessage()
}
/// Call this method to show alert message
///
/// - Parameter message: text that user must interact with it
func showAlartWith(message:String){
self.alert.message(message: message).show(view: self)
}