There is no method similar to the addtextfield method in Uialertcontroller. I haven't found any examples of how I can customize MDCAlertControllers. Anybody have an idea?
I think this is not possible. The docs say:
MDCAlertController class is intended to be used as-is and does not
support subclassing. The view hierarchy for this class is private and
must not be modified.
This is now possible by using accessoryView.
Simply set it to be your custom view and set the alert message to be blank.
alertController.accessoryView = myCustomView
Code example (using SnapKit for layout)
let title = "My title"
let alertController = MDCAlertController(title: title, message: "")
let confirmAction = MDCAlertAction(title:"Confirm") { [weak self] _ in
//your action here
}
let cancelAction = MDCAlertAction(title:"Cancel")
let width = UIScreen.main.bounds.width * 0.91
let testView = UIView()
let button = UIButton()
button.setTitle("Test", for: .normal)
testView.addSubview(button)
button.snp.makeConstraints { (make) in
make.center.equalToSuperview()
}
testView.backgroundColor = .blue //just to show where the view is
testView.snp.makeConstraints { (make) in
make.width.equalTo(width)
make.height.equalTo(100)
}
alertController.accessoryView = testView
alertController.addAction(confirmAction)
alertController.addAction(cancelAction)
alertController.defaultTheming()
present(alertController, animated:true)
Result from above code
Related
I created a segmented control using
private let updateSwitch: UISegmentedControl = {
let sc = UISegmentedControl(items: ["Sign In", "Sign Out"])
sc.anchor(width: 128, height: 32)
sc.selectedSegmentIndex = 0
sc.tintColor = .mainBlue
sc.backgroundColor = .mainGray
sc.addTarget(self, action: #selector(handleSegmentedControlSwitch(_:)), for: .valueChanged)
return sc
}()
I then added updateSwitch to my navigation bar using
navigationItem.titleView = updateSwitch
The segmented control shows up completely fine but whenever I select either sign in or sign out, the selector code does not get executed
#objc func handleSegmentedControlSwitch(_ segmentedControl: UISegmentedControl) {
switch(segmentedControl.selectedSegmentIndex) {
case 0:
print("Sign In")
break
case 1:
print("Sign Out")
break
default:
break
}
}
Any idea on how I can fix this?
Attached is an image of the working segmented control
It's because of your UISegmentControl declaration.
You have 2 ways:
1. declare it as a lazy var:
because Self in lazy var is valid.
private lazy var updateSwitch: UISegmentedControl = {
let sc = UISegmentedControl(items: ["Sign In", "Sign Out"])
sc.anchor(width: 128, height: 32)
sc.selectedSegmentIndex = 0
sc.tintColor = .mainBlue
sc.backgroundColor = .mainGray
sc.addTarget(self, action: #selector(handleSegmentedControlSwitch(_:)), for: .valueChanged)
return sc }()
2. assign action in viewDidLoad
override func viewDidLoad() {
super.viewDidLoad()
let segmented = self.updateSwitch
segmented.addTarget(self, action: #selector(handleSegmentedControlSwitch(_:)), for: .valueChanged)
navigationItem.titleView = segmented
}
I am learning some auto layout programatically and I want to add a button on the bottom part of the screen, just above the safe area.
I know the code is working, because I tested it in another project, I think it is a conflict because I get to this viewController from another one.
The code for my button
private let previousButton : UIButton = {
let button = UIButton(type: .system)
button.setTitle("Prev", for: .normal)
button.translatesAutoresizingMaskIntoConstraints = false
return button
}()
The code for setting up my constraints
fileprivate func setupBottomControls() {
view.addSubview(previousButton)
previousButton.backgroundColor = .red
view.addSubview(previousButton)
NSLayoutConstraint.activate([
previousButton.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
previousButton.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
previousButton.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
previousButton.heightAnchor.constraint(equalToConstant: 50)
])
}
Like I said this code is working in another project but I think it is in conflict because of how I called this viewController.
This is a code from the first view controller that make the new viewController(GettingStartedController) to be shown, here it will be the button mentioned above.
func switchVC(){
//enter GettingStarted controller
let controller = GettingStartedController()
view.addSubview(controller.view)
present(UINavigationController(rootViewController: controller), animated: true,completion: nil) //used when no animation is present
}
I think the problem is here any ideas on how to change the call to the GettingStartedController so that will see the Safe Area the right way?
Check my code solution. I added your function to the button when it is tapped and it now presents the GettingStartedController():
private let previousButton : UIButton = {
let button = UIButton(type: .system)
button.setTitle("Prev", for: .normal)
button.translatesAutoresizingMaskIntoConstraints = false
button.addTarget(self, action: #selector(switchVC), for: .touchUpInside)
return button
}()
fileprivate func setupBottomControls() {
view.addSubview(previousButton)
previousButton.backgroundColor = .red
view.addSubview(previousButton)
NSLayoutConstraint.activate([
previousButton.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
previousButton.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
previousButton.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
previousButton.heightAnchor.constraint(equalToConstant: 50)
])
}
#objc func switchVC(){
//enter GettingStarted controller
let controller = GettingStartedController()
present(UINavigationController(rootViewController: controller), animated: true,completion: nil) //used when no animation is present
}
I want to change the title of backbutton to any name in swift 3.I tried many ways but none of them worked for me.
self.navigationItem.backBarButtonItem?.title="Title"
self.navigationController?.navigationItem.backBarButtonItem?.title="Title"
Just for information i have written below code in appdelegate.
let backImage : UIImage = UIImage(named:"backArrow")!
UINavigationBar.appearance().barTintColor = UIColor(red: 0.0/255.0, green: 0.0/255.0, blue: 0.0/255.0, alpha: 1.0)
UINavigationBar.appearance().tintColor = UIColor.white
UINavigationBar.appearance().backIndicatorImage = backImage
UINavigationBar.appearance().backIndicatorTransitionMaskImage = backImage
UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName : UIColor.white]
UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffsetMake(0, 0), for: .default)
IQKeyboardManager.sharedManager().enable = true
self.window?.backgroundColor = UIColor.white
Navigation item back button name will be same as the title of previous view controller which is pushing it to the navigation stack :)
So if VC A pushes VC B, back button in VC B will be A.
So all you can do is, to change the title of the previous viewController before pushing the new viewController using code :)
self.navigationItem.title = "ABCD"
And in ViewWillAppear of VC A,you can revert the title back to whatever it was earlier :)
self.navigationItem.title = "Back to xyz"
All that being said, if you don't want all this circus :) you can simply hide the default back button using,
self.navigationItem.hidesBackButton = true
in your VC B, create a UIBarButton item, set whatever the title you want to set and then set that as leftBarButtonItem :) using,
self.navigationItem.leftBarButtonItem = UIBarButtonItem(title: NSLocalizedString("ABCD", comment: "ABCD"), style: .plain, target: self, action:#selector(self.abcdTapped:)
of course now that will not show "<" icon :) Now if you want that as well you can add it as a image to back bar button item :) but its cumbersome :)
Hope it helps :)
You will have to set the backBarButtonItem property of the navigationItem of the viewController that you push the said viewController from.
self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "Back", style: UIBarButtonItemStyle.plain, target: nil, action: nil)
However, you must set this for each viewController.
This is the way:
extension UINavigationController {
func addCustomBackButton(title: String = "Back") {
let backButton = UIBarButtonItem()
backButton.title = title
navigationBar.topItem?.backBarButtonItem = backButton
}
}
In Swift 3.0 put below code in appdelegate didFinishLaunchingWithOptions method its worked perfectly for me
let backImage = UIImage(named: "BackNavigation")?.withRenderingMode(.alwaysOriginal)
UINavigationBar.appearance().backIndicatorImage = backImage
UINavigationBar.appearance().backIndicatorTransitionMaskImage = backImage
UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffsetMake(0, -80.0), for: .default)
The last line will remove the title of Navigation Back Button if you don't want to remove title then just comment it
I didn't find the answer that I was looking for so I share with you my solution.
Sometimes you have to change the text of the back button in the parent ViewController and not in the ViewController where seems to be defined the back button, remember that a navigation controller stacks ViewControllers one after another.
In my case I did this on the function prepare(for segue: ) of the "ParentViewController":
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showChildViewController" {
if let childViewController = segue.destination as? ChildViewController {
let backItem = UIBarButtonItem()
backItem.title = "Back"
navigationItem.backBarButtonItem = backItem
}
}
Try following steps to set image to your back button..
Output:
Step 1:
Add following code to your AppDelegate
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
var backButtonImage = UIImage(named: "Your Image Name")
backButtonImage = backButtonImage?.stretchableImage(withLeftCapWidth: 0, topCapHeight: 0)
UIBarButtonItem.appearance().setBackButtonBackgroundImage(backButtonImage, for: .normal, barMetrics: .default)
UINavigationBar.appearance().barTintColor = UIColor(red: 0.0/255.0, green: 0.0/255.0, blue: 0.0/255.0, alpha: 1.0)
UINavigationBar.appearance().tintColor = UIColor.white
return true
}
Step 2:
Add following code to your MainVC
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
title = "Title 1"
navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName:UIColor.white, NSFontAttributeName:UIFont(name:"HelveticaNeue", size: 20)!]
}
Step 3:
Add following code to your DestVC or 2ndVC
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
title = "Title 2"
navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName:UIColor.white, NSFontAttributeName:UIFont(name:"HelveticaNeue", size: 20)!]
}
Step 4:
Select your navigationBar from your StoryBoard and goto Attribute Inspector. Under Navigation Item change your Back Button name enter a empty space or programatically create a back button with plain title..
Step 5:
Add icon image to your Assets. 1x29pt,2x58pt and 3x87pt. I am not sure about the asset image size.Check with apple doc about the size class..
Update:
My Similar answer related to this post.
How to customize the navigation back symbol and navigation back text?
You can easily do that from the storyboard by setting the title of the previous screen. Image explaining how to do that from storyboard - or you can do that by adding the following code to the view controller you're navigating BACK to.
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(true)
let backItem = UIBarButtonItem()
backItem.title = "Title"
navigationItem.backBarButtonItem = backItem
}
in viewDidLoad()
let backBarButtonItem = UIBarButtonItem(title: "You back button title here", style: .plain, target: nil, action: nil)
navigationItem.backBarButtonItem = backBarButtonItem
I have two view A and view B.
From view A to view B, I do not use navigation controller, I used performSegueWithIdentifier() and I don't want to use navigation controller to pass view A to view B.
But in the view B, I want to add a leftBarButtonItem in the navigation bar(I have embed a navigation controller for view B) like a back button with a arrow.
In order to achieve 100% same with the system backbitten with arrow. I use NSMutableAttributedString and UIButton. code is below:
let string = "< Retour" as NSString
var attributedString = NSMutableAttributedString(string: string as String)
let ArrowAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor(), NSFontAttributeName: UIFont.systemFontOfSize(20)]
let TextAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor(), NSFontAttributeName: UIFont.systemFontOfSize(10)]
attributedString.addAttributes(ArrowAttributes, range: string.rangeOfString("<"))
attributedString.addAttributes(ArrowAttributes, range: string.rangeOfString(" Retour"))
let backbutton = UIButton(type: .Custom)
backbutton.addTarget(self, action: "back:", forControlEvents: .TouchUpInside)
backbutton.setAttributedTitle(attributedString, forState: UIControlState.Normal)
self.navigationItem.setLeftBarButtonItem(UIBarButtonItem(customView: backbutton), animated: true)
rightBtn = UIBarButtonItem(title: "Ok", style: .Plain, target: self, action: "save:")
But I can not see left button in the navigation bar in view B…why I can not see it in the navigation bar? Why the left button disappear?
Thank you very much.
I have tried the new code for a label, but it doesn't work yet...
let barButtonBackStr = "< Back"
let attributedBarButtonBackStr = NSMutableAttributedString(string: barButtonBackStr as String)
attributedBarButtonBackStr.addAttribute(NSFontAttributeName,
value: UIFont(
name: "AmericanTypewriter-Bold",
size: 18.0)!,
range: NSRange(
location:0,
length:1))
let label = UILabel()
label.attributedText = attributedBarButtonBackStr
label.sizeToFit()
let newBackButton = UIBarButtonItem(customView: label)
self.navigationController!.navigationItem.setLeftBarButtonItem(newBackButton, animated: true)
Thank you
Try a backbutton.sizeToFit() you'll see your button
You create a button but you never set the frame
You can also set the frame directly instead of sizeToFit() method like backbutton.frame = CGRectMake(0, 0, 100, 20)
PS: TextAttributes wasn't used
You must write it to :
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
...
}
Try to set a breakpoint after your UI design and try to launch the Debug View Hierarchy to see if your button exist or is hidden by another object
Next, after you have set your button try to make:
self.navigationController!.navigationItem.leftBarButtonItem.customView.sizeToFit()
When I created a button earlier it had the ability to be an "action" IBA function..
How can I create the same thing with a label? so when I click the label my app will direct to a new page. (and how can I make it to direct to a new page? would I have to make a totally new view and in some way link it to that)
Please bare in mind, I'm a totally new to swift and have already come along way with my program,but its been pieces from several tutorials and therefor I might have a hard time understanding your answer the first time.
You can use UITapGestureRecognizer for that and below is simple example for you:
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let label = UILabel(frame: CGRectMake(0, 0, 200, 21))
label.center = CGPointMake(160, 284)
label.textAlignment = NSTextAlignment.Center
label.userInteractionEnabled = true
label.text = "I'am a test label"
self.view.addSubview(label)
let gestureRecognizer = UITapGestureRecognizer(target: self, action: "handleTap:")
label.addGestureRecognizer(gestureRecognizer)
}
func handleTap(gestureRecognizer: UIGestureRecognizer) {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewControllerWithIdentifier("next")
self.presentViewController(vc, animated: true, completion: nil)
}
}
Result:
Project sample for more Info.
Swift 3
1- Make sure you've checked the "User Interaction Enabled" in attributes inspector.
2- Code:
let gestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(YourVC.labelTapped))
yourLabel.addGestureRecognizer(gestureRecognizer)
3- Use the func:
func labelTapped() {
print("labelTapped tapped")
}