有没有办法在Swift中将UIPickerView添加到UIAlertController(Alert或ActionSheet)中？

Question

我对swift(以及iOS编程)完全不熟悉,但我开始搞乱它(当一切仍然是beta版本时,这不是一个好主意:D).所以我试着自己弄清楚,但仍然没有.甚至试图添加包含选择器的子视图而没有任何成功.那么任何人都可以帮助我吗？

Answer 1

那么这是我的最终代码,对我有用.这是一些想法的混合.我接受我答案的主要原因是我的代码是在Swift中,我的代码使用UIAlertController,我的代码是选择器.我要感谢Jageen - 我的回答是基于他的想法.

    func showPickerInActionSheet(sentBy: String) {
    var title = ""
    var message = "\n\n\n\n\n\n\n\n\n\n";
    var alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.ActionSheet);
    alert.modalInPopover = true;


    //Create a frame (placeholder/wrapper) for the picker and then create the picker
    var pickerFrame: CGRect = CGRectMake(17, 52, 270, 100); // CGRectMake(left), top, width, height) - left and top are like margins
    var picker: UIPickerView = UIPickerView(frame: pickerFrame);

    /* If there will be 2 or 3 pickers on this view, I am going to use the tag as a way
    to identify them in the delegate and datasource. /* This part with the tags is not required.
    I am doing it this way, because I have a variable, witch knows where the Alert has been invoked from.*/
    if(sentBy == "profile"){
        picker.tag = 1;
    } else if (sentBy == "user"){
        picker.tag = 2;
    } else {
        picker.tag = 0;
    }

    //set the pickers datasource and delegate
    picker.delegate = self;
    picker.dataSource = self;

    //Add the picker to the alert controller
    alert.view.addSubview(picker);

    //Create the toolbar view - the view witch will hold our 2 buttons 
    var toolFrame = CGRectMake(17, 5, 270, 45);
    var toolView: UIView = UIView(frame: toolFrame);

    //add buttons to the view
    var buttonCancelFrame: CGRect = CGRectMake(0, 7, 100, 30); //size & position of the button as placed on the toolView

    //Create the cancel button & set its title
    var buttonCancel: UIButton = UIButton(frame: buttonCancelFrame);
    buttonCancel.setTitle("Cancel", forState: UIControlState.Normal);
    buttonCancel.setTitleColor(UIColor.blueColor(), forState: UIControlState.Normal);
    toolView.addSubview(buttonCancel); //add it to the toolView

    //Add the target - target, function to call, the event witch will trigger the function call
    buttonCancel.addTarget(self, action: "cancelSelection:", forControlEvents: UIControlEvents.TouchDown);


    //add buttons to the view
    var buttonOkFrame: CGRect = CGRectMake(170, 7, 100, 30); //size & position of the button as placed on the toolView

    //Create the Select button & set the title
    var buttonOk: UIButton = UIButton(frame: buttonOkFrame);
    buttonOk.setTitle("Select", forState: UIControlState.Normal);
    buttonOk.setTitleColor(UIColor.blueColor(), forState: UIControlState.Normal);
    toolView.addSubview(buttonOk); //add to the subview

    //Add the tartget. In my case I dynamicly set the target of the select button
    if(sentBy == "profile"){
        buttonOk.addTarget(self, action: "saveProfile:", forControlEvents: UIControlEvents.TouchDown);
    } else if (sentBy == "user"){
        buttonOk.addTarget(self, action: "saveUser:", forControlEvents: UIControlEvents.TouchDown);
    }

    //add the toolbar to the alert controller
    alert.view.addSubview(toolView);

    self.presentViewController(alert, animated: true, completion: nil);
}

func saveProfile(sender: UIButton){
    // Your code when select button is tapped

}

func saveUser(sender: UIButton){
    // Your code when select button is tapped
}

func cancelSelection(sender: UIButton){
    println("Cancel");
    self.dismissViewControllerAnimated(true, completion: nil);
    // We dismiss the alert. Here you can add your additional code to execute when cancel is pressed
}

// returns number of rows in each component..
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{
    if(pickerView.tag == 1){
        return self.profilesList.count;
    } else if(pickerView.tag == 2){
        return self.usersList.count;
    } else  {
        return 0;
    }
}

// Return the title of each row in your picker ... In my case that will be the profile name or the username string
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
    if(pickerView.tag == 1){

            var selectedProfile: Profiles = self.profilesList[row] as Profiles;
            return selectedProfile.profileName;

    } else if(pickerView.tag == 2){

            var selectedUser: Users = self.usersList[row] as Users;
            return selectedUser.username;

    } else  {

        return "";

    }

}

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    if(pickerView.tag == 1){
            var choosenProfile: Profiles = profilesList[row] as Profiles;
            self.selectedProfile = choosenProfile.profileName;
    } else if (pickerView.tag == 2){
            var choosenUser: Profiles = usersList[row] as Users;
            self.selectedUsername = choosenUser.username;
    }

}

Answer 2

试试这个我做了一些技巧......

下面的代码适用于iPod iOS8beta5 + XCode6
我在Objective-c中的UIAlertController中添加了UIActivityIndi​​catorView控件.

UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil
                                        message:@"Please wait\n\n\n"
                                 preferredStyle:UIAlertControllerStyleAlert];

    UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    spinner.center = CGPointMake(130.5, 65.5);
    spinner.color = [UIColor blackColor];
    [spinner startAnimating];
    [alert.view addSubview:spinner];
    [self presentViewController:alert animated:NO completion:nil];

注意:
它在objective-c中,但是通过这个证明我们也可以使用swift来做到这一点.

Answer 3

您可以在iOS8/Swift中使用类似的代码将自己的控件添加到屏幕中间弹出的警报(而不是操作表)中.

使用alert.addSubView执行此操作时唯一的问题是警报视图仅根据您通过类方法添加的控件来自行调整大小.然后,您必须添加自己的约束,以确保警报包含所有控件.

我在这里添加了一个示例,原始问题是Alert或ActionSheet

func addAlert(){

    // create the alert
    let title = "This is the title"
    let message = "This is the message"
    var alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert);
    alert.modalInPopover = true;

    // add an action button
    let nextAction: UIAlertAction = UIAlertAction(title: "Action", style: .Default){action->Void in
        // do something
    }
    alert.addAction(nextAction)

    // now create our custom view - we are using a container view which can contain other views
    let containerViewWidth = 250
    let containerViewHeight = 120
    var containerFrame = CGRectMake(10, 70, CGFloat(containerViewWidth), CGFloat(containerViewHeight));
    var containerView: UIView = UIView(frame: containerFrame);

    alert.view.addSubview(containerView)

    // now add some constraints to make sure that the alert resizes itself
    var cons:NSLayoutConstraint = NSLayoutConstraint(item: alert.view, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.GreaterThanOrEqual, toItem: containerView, attribute: NSLayoutAttribute.Height, multiplier: 1.00, constant: 130)

    alert.view.addConstraint(cons)

    var cons2:NSLayoutConstraint = NSLayoutConstraint(item: alert.view, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.GreaterThanOrEqual, toItem: containerView, attribute: NSLayoutAttribute.Width, multiplier: 1.00, constant: 20)

    alert.view.addConstraint(cons2)

    // present with our view controller
    presentViewController(alert, animated: true, completion: nil)

}

Answer 4

斯威夫特 5.2 / Xcode 11.6 / iOS 11.4

func addAlert(){

    // create the alert
    let title = "This is the title"
    let message = "This is the message"
    let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertController.Style.alert);
    alert.isModalInPopover = true;

    // add an action button
    let nextAction: UIAlertAction = UIAlertAction(title: "Action", style: .default){action->Void in
        // do something
    }
    alert.addAction(nextAction)

    // now create our custom view - we are using a container view which can contain other views
    let containerViewWidth = 250
    let containerViewHeight = 120
    let containerFrame = CGRect(x:10, y: 70, width: CGFloat(containerViewWidth), height: CGFloat(containerViewHeight));
    let containerView: UIView = UIView(frame: containerFrame);

    alert.view.addSubview(containerView)

    // now add some constraints to make sure that the alert resizes itself
    let cons:NSLayoutConstraint = NSLayoutConstraint(item: alert.view, attribute: NSLayoutConstraint.Attribute.height, relatedBy: NSLayoutConstraint.Relation.greaterThanOrEqual, toItem: containerView, attribute: NSLayoutConstraint.Attribute.height, multiplier: 1.00, constant: 130)

    alert.view.addConstraint(cons)

    let cons2:NSLayoutConstraint = NSLayoutConstraint(item: alert.view, attribute: NSLayoutConstraint.Attribute.width, relatedBy: NSLayoutConstraint.Relation.greaterThanOrEqual, toItem: containerView, attribute: NSLayoutConstraint.Attribute.width, multiplier: 1.00, constant: 20)

    alert.view.addConstraint(cons2)

    // present with our view controller
    present(alert, animated: true, completion: nil)

}