我对 swift （和 iOS 编程）完全陌生，但我开始弄乱它（当一切仍然是 beta 版本时，这不是一个好主意：D）。所以我试图自己弄清楚，但仍然没有。甚至尝试添加包含选择器的子视图但没有任何成功。那么任何人都可以帮助我吗？
问问题
49347 次
12 回答
30
好吧，这是对我有用的最终代码。这是几个想法的混合。我接受我的回答的主要原因是我的代码是用 Swift 编写的，我的代码使用 UIAlertController，我的代码是用于选择器的。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;
}
}
于 2014-11-25T09:23:02.483 回答
9
试试这个我做了一些技巧......
下面的代码在 iPod iOS8beta5 + XCode6 中为我工作我在
Objective-c 的 UIAlertController 中添加 UIActivityIndicatorView 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，但由此证明我们也可以使用swift来做到这一点。
于 2014-09-05T09:38:14.093 回答
8
您可以在 In iOS8 / Swift 中使用类似的代码将您自己的控件添加到屏幕中间弹出的警报（而不是操作表）中。
我在使用 alert.addSubView 时遇到的唯一问题是，警报视图仅根据您通过类方法添加的控件调整自身大小。然后，您必须添加自己的约束以确保警报包含您的所有控件。
我在这里添加了一个示例，因为原始问题要求 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)
}
于 2014-12-18T16:12:46.037 回答
4
我需要做同样的事情，这就是我解决它的方法。我做了类似于 Jageen 的事情。我的代码如下。请注意，我将 UIPickerView 中的值放在代码的不同部分。
//Need to use an UIAlertController for iOS 8 instead of an action view
UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil
message:@"\n\n\n\n\n\n\n\n"
preferredStyle:UIAlertControllerStyleAlert];
//Make a frame for the picker & then create the picker
CGRect pickerFrame = CGRectMake(0, 0, 270, 100);
UIPickerView *regionsPicker = [[UIPickerView alloc] initWithFrame:pickerFrame];
//There will be 3 pickers on this view so I am going to use the tag as a way
//to identify them in the delegate and datasource
regionsPicker.tag = 1;
//set the pickers datasource and delegate
regionsPicker.dataSource = self;
regionsPicker.delegate = self;
//set the pickers selection indicator to true so that the user will now which one that they are chosing
[regionsPicker setShowsSelectionIndicator:YES];
//Add the picker to the alert controller
[alert.view addSubview:regionsPicker];
//make the toolbar view
UIView *toolView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 270.0f, 44.f)];
toolView.backgroundColor = [UIColor blackColor]; //set it's background
//add buttons to the view
CGRect buttonFrame = CGRectMake(0, 5, 100, 30); //size & position of the button as placed on the toolView
//make the cancel button & set the title
UIButton *button = [[UIButton alloc] initWithFrame: buttonFrame];
[button setTitle: @"Cancel" forState: UIControlStateNormal];
[button setTitleColor: [UIColor blueColor] forState: UIControlStateNormal]; //make the color blue to keep the same look as prev version
[toolView addSubview:button]; //add to the subview
//Add the tartget
[button addTarget: self
action: @selector(cancelRegionSet)
forControlEvents: UIControlEventTouchDown];
//do the same for the select button
buttonFrame = CGRectMake(90, 5, 100, 30);
UIButton *selButton = [[UIButton alloc] initWithFrame:buttonFrame];
[selButton setTitle:@"Select" forState:UIControlStateNormal];
[selButton setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
[toolView addSubview:selButton];
[selButton addTarget: self
action: @selector(dismissRegionSet:)
forControlEvents: UIControlEventTouchDown];
//add the toolbar to the alert controller
[alert.view addSubview:toolView];
[self presentViewController:alert animated:NO completion:nil];
于 2014-09-08T15:08:50.293 回答
4
您可以使用 Objective-C 在 iOS 8 中添加像 UIActionSheet 这样的 Picker，方法是：-
colorArray = [[NSMutableArray alloc ]initWithObjects:@"One", @"Two", @"Three", @"Four", @"Five", nil];
picker = [[UIPickerView alloc]init];
picker.frame = CGRectMake(0.0, 44.0,self.view.frame.size.width, 216.0);
picker.dataSource = self;
picker.delegate = self;
picker.showsSelectionIndicator = true;
picker.backgroundColor = [UIColor whiteColor];
UIToolbar* pickerDateToolbar = [[UIToolbar alloc] initWithFrame: CGRectMake(0, 0, 320, 44)]; //(frame: CGRectMake(0, 0, 320, 44))
pickerDateToolbar.barStyle = UIBarStyleBlackTranslucent;//UIBarStyle.Black
pickerDateToolbar.barTintColor = [UIColor whiteColor];
pickerDateToolbar.translucent = true;
actionView.backgroundColor = [UIColor whiteColor];
UILabel* label = [[UILabel alloc] initWithFrame:CGRectMake(150, 5, 150, 20)];
label.backgroundColor = [UIColor clearColor];
label.textColor = [UIColor blackColor];
label.shadowColor = [UIColor blackColor];
label.shadowOffset = CGSizeMake(0, 1);
label.font = [UIFont systemFontOfSize:15];//[UIFont boldSystemFontOfSize:15];
label.text = @"Select a Status";
UIBarButtonItem *labeltext= [[UIBarButtonItem alloc] initWithCustomView:label];
UIBarButtonItem *cancelBtn = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style:UIBarButtonItemStylePlain target:self action:@selector(cancel_clicked:)];
UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStylePlain target:self action:@selector(done_clicked:)];
pickerDateToolbar.items = [[NSArray alloc] initWithObjects:cancelBtn,flexSpace,labeltext,doneBtn,nil];
cancelBtn.tintColor = [UIColor blueColor];
doneBtn.tintColor = [UIColor blueColor];
[actionView addSubview:pickerDateToolbar];
[actionView addSubview:picker];
if (window != nil) {
[window addSubview:actionView];
}
else
{
[self.view addSubview:actionView];
}
[UIView animateWithDuration:(0.2) animations:^{
actionView.frame = CGRectMake(0, self.view.frame.size.height - 260.0, self.view.frame.size.width, 260.0);
self.view.alpha = 0.5;
actionView.alpha = 1;
}];
在 ViewDidLoad 添加这个，
UIApplication * delegate = [UIApplication sharedApplication];
UIWindow *myWindow = delegate.keyWindow;
NSArray *myWindow2 = delegate.windows;
if(myWindow == [UIApplication sharedApplication].keyWindow)
window = myWindow;
else
window = myWindow2[0];
actionView = [[UIView alloc]initWithFrame:CGRectMake(0, UIScreen.mainScreen.bounds.size.height, UIScreen.mainScreen.bounds.size.width, 240.0)];
// 这是在弹出窗口中显示选择器时创建 ActionView 和褪色背景。
-(void)cancel_clicked:(id)sender{
NSLog(@"cancel clicked");
[UIView animateWithDuration:0.2 animations:^{
actionView.frame = CGRectMake(0, UIScreen.mainScreen.bounds.size.height - 260.0, UIScreen.mainScreen.bounds.size.width, 260.0);
} completion:^(BOOL finished) {
self.view.alpha = 1;
[actionView removeFromSuperview];
}];
}
// 取消按钮点击方法。
-(void)done_clicked:(id)sender{
NSLog(@"done clicked");
self.view.userInteractionEnabled = TRUE;
[UIView animateWithDuration:0.2 animations:^{
actionView.frame = CGRectMake(0, UIScreen.mainScreen.bounds.size.height - 260.0, UIScreen.mainScreen.bounds.size.width, 260.0);
} completion:^(BOOL finished) {
_permitStatus.text = [colorArray objectAtIndex:[picker selectedRowInComponent:0]];
self.view.alpha = 1;
[actionView removeFromSuperview];
}];
}
// 对于完成按钮单击。
于 2014-10-31T08:17:46.170 回答
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)
}
于 2018-06-28T14:50:15.200 回答
2
这是一个github 项目，它在屏幕中央弹出一个 UIDatePicker。它不使用 UIAlertController 或 UIAlertView。我不认为这是警报类的意图。
于 2014-08-29T20:27:44.830 回答
2
alertController = [UIAlertController alertControllerWithTitle:@" \n\n\n\n\n\n\n\n\n\n"
message:@""
preferredStyle:UIAlertControllerStyleActionSheet];
closePicker = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObject:@"Cancel"]];
closePicker.momentary = YES;
closePicker.frame = CGRectMake(25, 0.0f, 50.0f, 30.0f);
closePicker.segmentedControlStyle = UISegmentedControlStyleBar;
closePicker.tintColor = [UIColor blackColor];
[closePicker addTarget:self action:@selector(dismissActionSheet:) forControlEvents:UIControlEventValueChanged];
[alertController.view addSubview:closePicker];
UIPickerView *pickerFiliter=[[UIPickerView alloc]init];
pickerFiliter = [[UIPickerView alloc] initWithFrame:CGRectMake(0.0, 40.0, 320.0, 120.0)];
pickerFiliter.showsSelectionIndicator = YES;
pickerFiliter.dataSource = self;
pickerFiliter.delegate = self;
[alertController.view addSubview:pickerFiliter];
[self presentViewController:alertController animated:YES completion:nil];
- (IBAction)dismissActionSheet:(id)sender
{
[alertController dismissViewControllerAnimated:YES completion:nil];
}
于 2014-09-25T08:18:32.913 回答
1
斯威夫特 2.0：
制作一个示例选取器视图或分段视图并将其添加为 uialercontroller 的子视图。实现 uipickerview 委托并呈现 uialertcontroller。这是我实现相同目标的方法。
class ViewController:
UIViewController,UIPickerViewDataSource,UIPickerViewDelegate {
var samplePicker: UIPickerView = UIPickerView()
var sampleSegment:UISegmentedControl = UISegmentedControl ()
var alertController:UIAlertController = UIAlertController()
var buildings:[String] = ["BankBuilding", "Cinema" , "CornerShop", "Greg's House","14th Street"]
override func viewDidLoad() {
super.viewDidLoad()
samplePicker = UIPickerView(frame: CGRectMake(10.0, 40.0, 250, 150))
samplePicker.delegate = self;
samplePicker.dataSource = self;
samplePicker.showsSelectionIndicator = true
samplePicker.tintColor = UIColor.redColor()
samplePicker.reloadAllComponents()
sampleSegment = UISegmentedControl(items: NSArray(object: " Dismiss ") as [AnyObject])
sampleSegment.momentary = true
sampleSegment.frame = CGRectMake(25, 10.0, 100.0, 30.0)
sampleSegment.tintColor = UIColor.blackColor()
sampleSegment.backgroundColor = UIColor.orangeColor()
sampleSegment.addTarget(self, action: "dismissAlert", forControlEvents: UIControlEvents.ValueChanged)
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return 3
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return buildings[row] as String
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
print(buildings[0])
}
func pickerView(pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
return 36.0
}
override func viewDidAppear(animated: Bool)
{
alertController = UIAlertController(title: " \n\n\n\n\n\n\n\n\n\n", message: "", preferredStyle: UIAlertControllerStyle.Alert)
alertController.view.addSubview(sampleSegment)
alertController.view.addSubview(samplePicker)
self.presentViewController(alertController, animated: true, completion: nil)
}
func dismissAlert()
{
alertController.dismissViewControllerAnimated(true, completion: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
于 2016-03-02T07:35:56.567 回答
1
斯威夫特 3.0：
func showPickerInActionSheet() {
let title = ""
let message = "\n\n\n\n\n\n\n\n\n\n";
let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.actionSheet);
alert.isModalInPopover = true;
//Create a frame (placeholder/wrapper) for the picker and then create the picker
let pickerFrame = CGRect(x: 17, y: 52, width: 270, height: 100)
let picker: UIPickerView = UIPickerView(frame: pickerFrame)
//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
let toolFrame = CGRect(x: 17, y: 5, width: 270, height: 45)
let toolView: UIView = UIView(frame: toolFrame)
//add buttons to the view
let buttonCancelFrame = CGRect(x: 0, y: 7, width: 100, height: 30) //size & position of the button as placed on the toolView
//Create the cancel button & set its title
let buttonCancel: UIButton = UIButton(frame: buttonCancelFrame);
buttonCancel.setTitle("Cancel", for: .normal)
buttonCancel.setTitleColor(UIColor.blue, for: .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: Selector("cancelSelection:"), for: UIControlEvents.touchDown);
//add buttons to the view
let buttonOkFrame = CGRect(x: 170, y: 7, width: 100, height: 30)//size & position of the button as placed on the toolView
//Create the Select button & set the title
let buttonOk: UIButton = UIButton(frame: buttonOkFrame);
buttonOk.setTitle("Select", for: UIControlState.normal);
buttonOk.setTitleColor(UIColor.blue, for: UIControlState.normal);
toolView.addSubview(buttonOk); //add to the subview
buttonOk.addTarget(self, action: #selector(HomeViewController.saveDelayTime), for: UIControlEvents.touchDown);
//add the toolbar to the alert controller
alert.view.addSubview(toolView);
self.present(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){
self.dismiss(animated: 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 numberOfComponents(in pickerView: UIPickerView) -> Int{
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return 60
}
// 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? {
return "\(row)"
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
selectedTime = row
}
func saveDelayTime() {
self.dismiss(animated: true, completion: nil)
UserDefaults.standard.set(selectedTime, forKey: "DelayTimeKey")
let _ = UserDefaults.standard.synchronize()
}
于 2017-08-31T20:22:11.857 回答
1
这是一个带有用于选择器值的静态数组的选择器的警报。
func presentAlertWithPicker(title: String,
message: String,
pickerOptions: [String],
completion: @escaping ((_ pickerValueString: String) -> Void)){
// Add a picker handler to provide the picker in the alert with the needed data
class PickerHandler: NSObject, UIPickerViewDelegate, UIPickerViewDataSource{
var items: [String]
lazy var lastSelectedItem = items[0]
init(items: [String]){
self.items = items
super.init()
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
items.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
items[row]
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
print("selected item tag is \(pickerView.tag), row: \(row)")
lastSelectedItem = items[row]
}
}
DispatchQueue.main.async { [weak self] in
let pickerHandler = PickerHandler(items: pickerOptions)
let pickerView = UIPickerView(frame: .zero)
pickerView.delegate = pickerHandler
pickerView.dataSource = pickerHandler
let title = title
let message = message
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert);
let selectAction = UIAlertAction(title: "Select", style: .default){action->Void in
completion(pickerHandler.lastSelectedItem)
}
alert.addAction(selectAction)
// Add the picker view
alert.view.addSubview(pickerView)
pickerView.translatesAutoresizingMaskIntoConstraints = false
let constantAbovePicker: CGFloat = 70
let constantBelowPicker: CGFloat = 50
NSLayoutConstraint.activate([
pickerView.leadingAnchor.constraint(equalTo: alert.view.leadingAnchor, constant: 10),
pickerView.widthAnchor.constraint(equalToConstant: 250),
pickerView.widthAnchor.constraint(lessThanOrEqualTo: alert.view.widthAnchor, constant: 20),
pickerView.topAnchor.constraint(equalTo: alert.view.topAnchor, constant: constantAbovePicker),
pickerView.heightAnchor.constraint(equalToConstant: 150),
alert.view.bottomAnchor.constraint(greaterThanOrEqualTo: pickerView.bottomAnchor, constant: constantBelowPicker),
])
self?.present(alert, animated: true, completion: nil)
}
}
调用它。
presentAlertWithPicker(title: "This is the main title",
message: "This is the main message",
pickerOptions: ["1", "2", "3"]) { (pickerSelectedValue) in
print(pickerSelectedValue)
}
于 2021-02-10T19:08:43.880 回答