Enabling button if I write in TextField - ios

Question

I am having some problems with enabling a button when you write something in a TextField.
I got it to disable if a there's nothing in the TextField but I can't make it to enable again when you write something in it.
I have something like this:
- (void)viewDidLoad {
[super viewDidLoad];
NSUInteger textLength = [_Name.text length];
[_doneButton setEnabled:(textLength > 0)];
}

Answer 1

Set delegate to the UITextField and create a method for text change in ViewDidLoad as follows.
[self.textFieldTemp addTarget:self action:#selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
And add the method as follows.
- (void)textFieldDidChange:(UITextField *)textField {
if(textField == self.textFieldTemp)
self.buttonTemp.enabled = ([self.textFieldTemp.text length] > 0) ? YES : NO; }

Answer 2

Try this
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if([textField.text length]>0){
[doneButton setEnabled:YES];
}
else{
[doneButton setEnabled:NO ;
}
Hope this May be help you..

Answer 3

Use UITextField delegate method to enable your button again. When your textField characters are changed, delegate method will be called, enable your button here.
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
_doneButton.enabled = YES;
}

Answer 4

Put the lines in textfield delegate method:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
It'll work then. This method is called every time you input a character in textfield. But ViewDidLoad is called only when the viewcontroller is loaded.
Hope it will work for you.

Answer 5

These two functions will enable and disable your button according the text in your textfield
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
_doneButton.enabled = YES;
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{
if([textField.text length]>0){
[doneButton setEnabled:YES];
}
else{
[doneButton setEnabled:NO ;
}

Answer 6

You can use delegates of UITextField to enable and disable the button like this.
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
{
if (textField.text.length!=0)
{
yourButton.enabled = YES;
}
else
{
yourButton.enabled = NO;
}
}

Answer 7

The method I used didn't use the delegates at all. I created this method in the controller class:
- (IBAction)textFieldChanged:(id)sender
{
self.doneButton.enabled = ([self.Name.text length] > 0) ? YES : NO;
}
Then, in the Interface Builder, I set the text field "Editing Changed" action to target the new method. Then, similar to #Paramasivan Samuttiram, I added an extra call to it in the viewDidLoad:.
[self textFieldChanged:self.Name];
That part allows the button to be in the correct state initially.