How to use method in a view that i put controls on it from subclass of one of that controls

Question

I subclass a NSTextField and in subclass use an event method (keyUp),i want to call a method in main view (view that i put NSTextFiled on it) when user push Enter key.i use below code but don't how to call specific method in main view

- (void)keyUp:(NSEvent *)theEvent
{
    NSString *theArrow = [theEvent charactersIgnoringModifiers];
    unichar keyChar = 0;
    keyChar = [theArrow characterAtIndex:0];
    if ( keyChar == NSEnterCharacter )
    {
        //call method that exist in main view   
    }   
}

score 1 · Answer 1 · edited May 23 '17 at 11:55

1

This should do it...

SEL sel = @selector(textFieldDidPressEnter:);

if (self.delegate && [self.delegate respondsToSelector:sel]) {
    [self.delegate performSelector:sel withObject:self];
}

Then make sure the class you want to have this message is set as the delegate. The more complete answer is to also declare textFieldDidPressEnter: as part of the delegate protocol. Here's a good resource on how to do that.

edited May 23 '17 at 11:55

Community

1
1

answered Apr 28 '12 at 19:37

danh

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can you explain where should i enter this code ?and how to set class as delegate? – Apr 28 '12 at 19:44
sure. right where you have the comment // call method that exist in main view. Wherever the main view sets up the textField, you can say textField.delegate = self; The "self" needs to be declared as conforming to , and it needs to implement the method name I made up: textFieldDidPressEnter. You can change that name as you wish. – danh Apr 28 '12 at 19:47

score 0 · Accepted Answer · answered Apr 28 '12 at 20:14

1.in main view set : textField.delegate=self;

2.add <NSTextFieldDelegate> to mainview.h and subclass.h

3.use this code Instead of comment

if ( self.delegate && [self.delegate respondsToSelector:@selector(textFieldDidPressEnter:)] ) 
            [self.delegate performSelector:@selector(textFieldDidPressEnter:) withObject:self];

4.implement this method in mainview.m

-(void)textFieldDidPressEnter:(NSTextField *)txt
{

}

score 0 · Answer 3 · answered May 04 '12 at 20:15

0

if ( [self.delegate respondsToSelector:@selector(textFieldDidPressEnter:)] ) 
    [(id)self.delegate textFieldDidPressEnter:self];

no need to use performSelector:

answered May 04 '12 at 20:15

user102008

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How to use method in a view that i put controls on it from subclass of one of that controls

3 Answers3