无法识别的选择器发送到实例resignFirstResponder

Question

I'm using TPKeyboardAvoiding in my app to hide move text fields when the keyboard is showing, but I'm getting an exception when I try to end editing the text field. It's coming from this method in TPKeyboardAvoiding:

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    UIView* view =[self TPKeyboardAvoiding_findFirstResponderBeneathView:self];
    NSLog(@"%@",[view description]);
    [view resignFirstResponder]; //this line gives the exception
    [super touchesEnded:touches withEvent:event];
}

I'm a bit confused here. Shouldn't all UIViews respond to resignFirstResponder ? Thanks for the help.

Full error:

2014-03-25 17:40:39.919 Rysk[5553:70b] -[MenuViewController textFieldDidBeginEditing:]: unrecognized selector sent to instance 0xb63c820

Answer 1

Not sure if you have called [yourTextField resignFirstResponder] as well . So it is possible that the UITextField (in the code you have provided) is not the FirstResponder at that point . I would suggest to adjust your code like this:

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    UIView* view =[self TPKeyboardAvoiding_findFirstResponderBeneathView:self];

    if([view conformsToProtocol:@protocol(UITextFieldDelegate)] || [view conformsToProtocol:@protocol(UITextViewDelegate)]) && 
       [view isFirstResponder] && [view canResignFirstResponder])
    {
       [view resignFirstResponder];  
    }

    [super touchesEnded:touches withEvent:event];
}

Also, if you using PODs please make sure you are using a latest version, because the one i am using has something like this in this event:

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [[self TPKeyboardAvoiding_findFirstResponderBeneathView:self] resignFirstResponder];
    [super touchesEnded:touches withEvent:event];
}

Hope it helps!

Answer 2

Update your code as follows:

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    UIView* view =[self TPKeyboardAvoiding_findFirstResponderBeneathView:self];
    NSLog(@"%@",[view description]);
    if([view isKindOfClass:[UITextField class]]) {
        UITextField *myTextField = (UITextField *)view;
        [myTextField resignFirstResponder];
    }
    [super touchesEnded:touches withEvent:event];
}

Answer 3

Try this simple method....

- (void)viewDidLoad
{
    [super viewDidLoad];

    //--Gesture to resign keyborad on touch outside
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissKeyboard)];
    tap.cancelsTouchesInView = NO;
    [self.view addGestureRecognizer:tap];
}


//-- Resign keyboard on touch UIView
-(void)dismissKeyboard
{
    self.view.frame = CGRectMake(self.view.frame.origin.x, 0, self.view.frame.size.width, self.view.frame.size.height);
    [self.view endEditing:YES];
}

Answer 4

I solved the problem by having my view controller than contains the TPKeyboardAvoidingScrollView implement the UITextFieldDelegate protocol. Most importantly, these two methods:

- (void)textFieldDidBeginEditing:(UITextField *)textField{}
- (void)textFieldDidEndEditing:(UITextField *)textField{}