What is the best way to disable UITextField's 'return' keyboard key if input area does not contain any text? UITextField with enablesReturnKeyAutomatically property set to YES enables return key even if there are only spaces entered, but I'd like it to enable return key only when the text is not empty. any suggestions?
I don't know how you'd override the text input trait behaviour, but you could use the text field delegate method textField:shouldChangeCharactersInRange:replacementString: to prevent the user being able to enter spaces into an otherwise blank string. This would prevent any whitespace text being added, so the return key should not be enabled.
If you're not bothered about the return key actually being enabled, you could use textFieldShouldReturn:, again one of the text field delegate methods.
I would do something like the following
Create an extension to String and add a trim method (it will become handy in other scenarios too that's why I suggest an extension.
public func trim() -> String {
return stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
}
Make your class a delegate of UITextFieldDelegate and add the following fuction
func textFieldDidChange(textField: UITextField) {
textField.text = textField.text.trim()
}
Set the delegate of your UITextField to self.
Related
I have a textfield to which I need to listen to tab key, so that when ever the user press tab from that text field I can move the focus to next text field. I have implemented the below code to perform that operation.
func control(_ control: NSControl, textView: NSTextView, doCommandBy commandSelector: Selector) -> Bool {
if (commandSelector == #selector(insertTab)) {
if control == firstTextField {
makeNextTextFieldAsFirstResponder()
}
}
return true
}
My problem is that as I have implemented this code, delete key is not doing what it suppose to do(removing last character from the text field's text). Am I missing something here?
I am new to Mac development so excuse me if this question has been asked already somewhere.
I found the solution to my own problem. It turns out to be a simple mistake. I am not sure about how exactly this method works and how the return value affect the nature of the text field as I am new to Mac development, but it seems that the default return value should be false. Any insights to this behaviour are welcome.
I have a UITextField called commentField and I create an Observable<Bool> like this:
let isCommentFieldValid = self.commentField.rx.text.orEmpty.map({ !$0.isEmpty })
This observable determines whether a button is enabled or not.
The problem is that when I change the text property of commentField liked this:
self.commentField.text = ""
The isCommentFieldValid doesn't trigger again and, thus, the button's state doesn't change. Any edition using the UI works: if I remove all text from the field through the keyboard, the isCommentFieldValid updates, but via code it doesn't.
Is there a reason this doesn't work?
If you look at the underlying implementation for rx.text you'll see that it relies on the following UIControlEvents: .allEditingEvents and .valueChanged. Explicitly setting the text property on UITextField does not send actions for these events, so your observable is not updated. You could try sending an action explicitly:
self.commentField.text = ""
self.commentField.sendActions(for: .valueChanged)
When I begin to type, I want CapsLock to be preselected on the keyboard so I just type everything in Caps lock.
From Apple docs
The UITextInputTraits protocol defines features associated with keyboard input to a text object. For a custom text object to support keyboard input, it must adopt this protocol to interact properly with the text input management system. The UITextField and UITextView classes automatically support this protocol.
The auto-capitalization behavior of a text-based view. Used with the autocapitalizationType property.
enum UITextAutocapitalizationType : Int {
case None
case Words
case Sentences
case AllCharacters
}
You can achieve auto capitalisation of all characters by:
textField.autocapitalizationType = .allCharacters
If you want letters always capital on the textField, even if the user switches the Caps Lock button on the keyboard, you can use UITextFieldDelegate's textFieldDidChange method and set the text to be always uppercased, like this:
func textFieldDidChange(_ textField: UITextField) {
textField.text = textField.text?.uppercased()
}
In my UIViewController I have 2 textfields. One called passwordtextfield and the other retype. Instead of having people actually retype their passwords I want it to automatically fill it in. Is this possible? I tried something that keeps on crashing.
[_passwordtextfield addTarget:self action:#selector(updateTextField:) forControlEvents:UIControlEventEditingChanged];
- (void)updateTextField:(id)sender{
UITextField *retype = ((UITextField *)_passwordtextfield).text;
}
There is no need to cast your text field. You can assign direct value of your text field.So
Write this line
retypetextfield.text = _passwordtextfield.text;
instead of
UITextField *retype = ((UITextField *)_passwordtextfield).text;
I don't know why you want to do this, as mentioned in the comments, but to answer the question... It looks like you are creating a new UITextField in updateTextField instead of setting the text of one that exists. It should look something like this:
- (void)updateTextField:(id)sender{
retypeFied.Text = _passwordtextfield.text;
}
Substitute whatever you named the pointer to your second field for retypeField.
I'm looking for a non-hackish solution for this, so basically -inputView. The part that I'm not sure about is how to make it look like the regular keyboards, from the background to the keys. I realize that I could photoshop an apple keyboard, but this seems like it is a little hackish, especially if apple (probably not but still possible) decides to change the look of their keyboards. I know Numbers has done an excellent job of making extra keyboards that look like the standard system ones, and I would like to do it like those (although obviously they have access to the same resources that made the system keyboards, including possible private frameworks, etc.)
I used the following:
tenDigitKeyboard.m
-(IBAction)pressedKey:(UIButton *)sender
{
[delegate pressedKey:sender.tag];
}
where delegate is defined as `id delegate;
then in the delegate i do...
-(void)pressedKey:(NSInteger)key
{
NSString * bufferString = model.string;
if (key == -1) {//delete
model.string = [bufferString substringWithRange:NSMakeRange(0, [bufferString length]-1)];
}else{
//will need to change the following to lookup key value based on a lookup of the button.tag
model.string = [bufferString stringByAppendingFormat:#"%i",key];
}
[self update];//updates the view
}
I got the keyboard button artwork from: http://www.teehanlax.com/blog/iphone-gui-psd-v4/
Create a view controller and xib. The xib should have 1-9,0 and delete buttons mapped to IBOutlets in your controller. Store and retain the return value string as a property. You can add decimals, etc. if you wish. In the header, store an edition block closure with a property (or alternatively create a delegate or use notification).
#property (copy) void(^valueChangedBlock)(NSString* string);
On touch up, each button sends an event to a method like this:
- (IBAction) pressKey:(id)sender
{
NSString *toAppend;
// Instead of this switch you can store the values in a dictionary mapped by sender.
switch(sender)
{
case oneButton: toAppend=#"1"; break;
case twoButton: toAppend=#"2"; break;
...
}
returnValue = [returnValue appendString:toAppend];
valueChanged(returnValue);
}
Obviously the delete key should remove a character from the end of the string instead of appending. Other than creating the controller and adding this view as the inputView, you should add the valueChangedBlock and set it to update the text field. You may want to put a clear custom button over the text field set to make the field first responder so it doesn't appear as if the user can edit at any point in the string.