Two things: Specify the keyboard type to only show the numeric keypad. So, set the keyboardType to .numberPad. This, however is not enough to stop the user from entering invalid characters in the text field. For example, the user is still able to paste text or switch keyboards when using an iPad. Specify the text … Read more
The autoscroll-behavior is located in the UITableViewController functionality. To disable the automatic scrolling I found two ways: Use instead of the UITableViewController simply a UIViewController – set the datasource and delegate on your own. Override the viewWillAppear method and don’t call [super viewWillAppear: animated] With both solution you disable not only the Autoscroll, but also … Read more
A subclass that works this issue around. Create an arbitrary UITextField, then set the secure property to YES (via KVC in IB). Actually it implements a comment suggested by lukech. When textfield ends editing, it switches to an arbitrary textfield, then set a bulk of dots into, and some hack in text accessor to always … Read more
Venmo just open sourced their token field. https://github.com/venmo/VENTokenField.git
If you’re using Swift, go read my port of this answer for Swift 4 and use that instead. If you’re in Objective-C… Firstly, to your UITextFieldDelegate, add these instance variables… NSString *previousTextFieldContent; UITextRange *previousSelection; … and these methods: // Version 1.3 // Source and explanation: http://stackoverflow.com/a/19161529/1709587 -(void)reformatAsCardNumber:(UITextField *)textField { // In order to make the … Read more
The much safer approach is to use a UIToolBar with Done Button as inputAccessoryView. Sample Code : UIToolbar *keyboardDoneButtonView = [[UIToolbar alloc] init]; [keyboardDoneButtonView sizeToFit]; UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@”Done” style:UIBarButtonItemStyleBordered target:self action:@selector(doneClicked:)]; [keyboardDoneButtonView setItems:[NSArray arrayWithObjects:doneButton, nil]]; txtField.inputAccessoryView = keyboardDoneButtonView; Your -doneClicked method should look like this : – (IBAction)doneClicked:(id)sender { NSLog(@”Done Clicked.”); [self.view … Read more
I set the delegate of the UITextField to my ViewController class. In that class I implemented this method as following: – (BOOL)textFieldShouldReturn:(UITextField *)textField { [textField resignFirstResponder]; return NO; }
Your view controller should conform to UITextFieldDelegate, like below: class MyViewController: UIViewController, UITextFieldDelegate { } Set the delegate of your textfield: myTextField.delegate = self Implement the method in your view controller: textField(_:shouldChangeCharactersInRange:replacementString:) All together: class MyViewController: UIViewController, UITextFieldDelegate // Set delegate to class @IBOutlet var mytextField: UITextField // textfield variable override func viewDidLoad() { super.viewDidLoad() … Read more
Alternatively, you can use this, which is called every time a key is pressed: name1.addTarget(self, action: “textFieldDidChange:”, forControlEvents: UIControlEvents.EditingChanged) name2.addTarget(self, action: “textFieldDidChange:”, forControlEvents: UIControlEvents.EditingChanged) name3.addTarget(self, action: “textFieldDidChange:”, forControlEvents: UIControlEvents.EditingChanged) name4.addTarget(self, action: “textFieldDidChange:”, forControlEvents: UIControlEvents.EditingChanged) func textFieldDidChange(textField: UITextField) { if name1.text?.isEmpty || name2.text?.isEmpty || name3.text?.isEmpty || name4.text?.isEmpty { //Disable button } else { //Enable button } … Read more
This is a historical thing. UITextField does not make any difference between an empty string and a nil string. In Objective-C there was no need to make a difference between them because you can call methods on nil in Objective-C. Also, there was no way in Objective-C to prevent users from assigning nil to a … Read more