When observing text value in <code class="notranslate

Problem observing UITextField about block-kvo HOT 4 CLOSED

tricertops commented on June 16, 2024

Problem observing UITextField

from block-kvo.

Comments (4)

Tricertops commented on June 16, 2024

I am afraid this is how UITextField works now. This behavior was changed in some version of iOS, because it definitely was working that way.

from block-kvo.

Tricertops commented on June 16, 2024

I changed the example in README, that was using UITextFiel.text observation.

from block-kvo.

fawkeswei commented on June 16, 2024

Found a workaround, just set the viewController as textField's delegate and add the following method.

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    textField.text = [textField.text stringByReplacingCharactersInRange:range withString:string];
    return NO;
}

from block-kvo.

Tricertops commented on June 16, 2024

This is also an option, subclass UITextField and add observableText property.

@interface MTKTextField : UITextField

@property (nonatomic, copy) NSString *observableText;

@end

@implementation MTKTextField

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        [self addTarget:sefl action:@selector(updateText) forControlEvents:UIControlEventEditingChanged];
    }
    return self;
}

- (void)updateText {
   // Calling the setter should invoke observation methods.
    self.observableText = self.text;
}

- (NSString *)observableText {
    // Just forwarding to `text` property.
    return self.text;
}

- (void)setObservableText:(NSString *)observableText {
    // Just forwarding to `text` property.
    self.text = observableText;
}

@end

Then just use this class instead fo standard UITextField.

Be careful, because assigning self.text to self.text will not invoke observation blocks. That's a feature of this library. It's usualy useful, but sometimes causes troubles like this.

from block-kvo.

Recommend Projects