UIAlertViewController 类型的动作表，带有动态按钮列表

Question

由于 UIAlertView 和 UIActionsheet 从 iOS 8 中已弃用。因此建议不要同时使用这两个类。使用旧的操作表方法，我可以在 for 循环的帮助下动态添加选项卡。

UIActionSheet *actionSheet = [[UIActionSheet alloc]init];
actionSheet.title = @"Departure City";
actionSheet.delegate = self;
actionSheet.tag = 1;

for (int j =0 ; j<arrayDepartureList.count; j++)
{
    NSString *titleString = arrayDepartureList[j];
    [actionSheet addButtonWithTitle:titleString];
}

我可以在委托方法中使用按钮索引来执行适当的操作。这样我可以动态创建操作表。所以UIAlertController 类如何实现这一点，我问这个是因为在UIAlertController 类中我们必须添加动作处理程序及其动作块。

Answer 1

由于 UIActionSheet 在 iOS 8 中已弃用，您必须使用 UIAlertViewController 并添加每个操作，如本例所示：

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"My Alert"
        message:@"This is an action sheet." 
        preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction *firstAction = [UIAlertAction actionWithTitle:@"one"
        style:UIAlertActionStyleDefault handler:^(UIAlertAction * action) {
            NSLog(@"You pressed button one");
        }];
UIAlertAction *secondAction = [UIAlertAction actionWithTitle:@"two"
        style:UIAlertActionStyleDefault handler:^(UIAlertAction * action) {
            NSLog(@"You pressed button two");
        }];

[alert addAction:firstAction];
[alert addAction:secondAction];

[self presentViewController:alert animated:YES completion:nil];

根据您的示例，您可以在 for 循环中添加 UIAlertAction，该操作会导致一些处理选择的函数。

我更喜欢的另一个解决方案： 使用ActionSheetPicker，从选择器中选择您的出发城市，而不是每个城市的按钮，您可以在此处找到它： https://github.com/skywinder/ActionSheetPicker-3.0

Answer 2

可以通过以下方式完成..

UIAlertController *departureActnSht = [UIAlertController alertControllerWithTitle:@"Departure City"
                                                                          message:@"Select your choice"
                                                                   preferredStyle:UIAlertControllerStyleActionSheet];

for (int j =0 ; j<arrayDepartureList.count; j++)
{
    NSString *titleString = arrayDepartureList[j];
    UIAlertAction *action = [UIAlertAction actionWithTitle:titleString style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){

        self.txtDepartureCity.text = arrayDepartureList[j];
    }];

    [departureActnSht addAction:action];
}

UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *action){

    [self dismissViewControllerAnimated:departureActnSht completion:nil];
}];

[departureActnSht addAction:cancelAction];
[self presentViewController:departureActnSht animated:YES completion:nil];

Answer 3

就像你在这里做的一样。

for (int j =0 ; j<arrayDepartureList.count; j++)
{
    NSString *titleString = arrayDepartureList[j];
    UIAlertAction * action = [UIAlertAction actionWithTitle:titleString style:UIAlertActionStyleDefault handler:nil];

    [alertController addAction:action];
}

如果您需要为每个操作自定义操作，您可以在处理程序部分定义它们。

有关更多信息，请查看此处： http://hayageek.com/uialertcontroller-example-ios/

Answer 4

 let arrayList = ["Agra","Banglore","delhi","Mumbai"]
        let optionMenu = UIAlertController(title: nil, message: "Choose City", preferredStyle: .actionSheet)
        for i in arrayList{
            let cityName = UIAlertAction(title: i, style: .default, handler:
            {
                (alert: UIAlertAction!) -> Void in



           print(i)

        })
        optionMenu.addAction(cityName)

    }

    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler:
    {
        (alert: UIAlertAction!) -> Void in
        print("Cancelled")
    })
    optionMenu.addAction(cancelAction)
    self.present(optionMenu, animated: true, completion: nil

Answer 5

斯威夫特 4

UIAlertController 与动态UIAlertAction

• 为按钮标题创建一个 String 数组

let buttonTitles = ["First", "Second", "Third"]

• 关闭

typealias completionWithValueAndIndex = (_ actionTitle :String, _ index: Int) ->()

• 定义一个方法showAlertsList

func showAlertsList(title: String, message: String, buttonsTitle:[String], completion: completionWithValueAndIndex? = nil) {
        let alert = UIAlertController(  title: title,  message:message, preferredStyle: .alert)
        let handler = { (action: UIAlertAction) -> Void in
            let index = alert.actions.firstIndex { $0 == action}
            completion?(action.title ?? "", index ?? 0)
        }
        for i in 0..<buttonsTitle.count {
            alert.addAction(UIAlertAction(title: buttonsTitle[i], style: .default, handler: handler))
        }
        
        self.present(alert, animated: true, completion: nil)
 }

• 使用方法

showAlertsList(title: "Test title", message: "Test message", buttonsTitle: buttonTitles) { actionTitle, index in
     print(actionTitle)
     print(index)
}

Answer 6

简单明了，以防您确实需要索引（或 PK 或类似...） 导入 UIKit

class ViewController: UIViewController {
override func viewDidLoad() {
    super.viewDidLoad()

    showAlertWith(msg: "when to start:", btnTitles:
        [
            "Now",
            "15 secs",
            "30 secs",
            "1 min.",
        ])
}



class TaggedAlertAction: UIAlertAction{
    var tag = 0
}

final private func showAlertWith(msg: String, btnTitles: [String]){

    let alert = UIAlertController(
        title: title,
        message:msg,
        preferredStyle: .alert)

    let handler = { (act: TaggedAlertAction) in
        let ta = act as! TaggedAlertAction
        let tag = ta.tag

        print(tag)
    }

    for i in 0..<btnTitles.count {
        let a = TaggedAlertAction(title: btnTitles[i], style: .default, handler: handler
        a.tag = i+1 // or Whatever number You need...
        alert.addAction(a)
    }
    self.present(alert, animated: true, completion: nil)
}

}

Answer 7

您可以根据任何动态列表向 UIAlertViewControler 添加操作。使用简单的 for 循环并在每次迭代中创建 UIAction。最好根据您定义的标签设置标签值并执行操作，这是示例代码。希望能帮助到你 https://github.com/Usman4Whizpool/UIAlertController