HOW?: create a dynamic UIButton

Ironcladmvtm · 01-14-2010, 12:07 PM

i am working on a quiz game app... but i want the UIButtons to be dynamicly filled from the table of answers.

i am very new to iphone dev and development in general... only been working with objective-c for about a month.

i have tried "UIButton.text =" this is surely a beginners mistake

could anyone point me in the right direction?

Thanks in advance for any help!

**Oliver Drobnik** · 01-14-2010, 01:10 PM

Quote:

Originally Posted by Ironcladmvtm

i am working on a quiz game app... but i want the UIButtons to be dynamicly filled from the table of answers.

i am very new to iphone dev and development in general... only been working with objective-c for about a month.

i have tried "UIButton.text =" this is surely a beginners mistake

could anyone point me in the right direction?

Thanks in advance for any help!

Depends what kind of button, you can also combine it with foreground and background images.

But a simple button you create programmatically:

Code:

UIButton *oneButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; // autoreleased

then you set the text:

Code:

[oneButton setTitle:@"Text" forState:UIControlStateNormal];

finally you need to add the button to the a view so that it get's displayed and retained.

Code:

[anyView addSubview:oneButton];

ah and you might want to set the button's dimensions. You can do this before or after the addSubview:

Code:

oneButton.frame = CGRectMake(x, y, w, h);

the buttonWithType class methods makes a autoreleased instance, the addSubview increases retain count to two. Then the autorelease pool draining reduces it to one.

when you finally call

Code:

[oneButton removeFromSuperview];

it disappears both from the screen as well as memory because this decreases the retainCount to 0 = dealloc.

Ironcladmvtm · 01-14-2010, 03:44 PM

Quote:

Originally Posted by Oliver Drobnik

Depends what kind of button, you can also combine it with foreground and background images.

But a simple button you create programmatically:

Code:

UIButton *oneButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; // autoreleased

then you set the text:

Code:

[oneButton setTitle:@"Text" forState:UIControlStateNormal];

finally you need to add the button to the a view so that it get's displayed and retained.

Code:

[anyView addSubview:oneButton];

ah and you might want to set the button's dimensions. You can do this before or after the addSubview:

Code:

oneButton.frame = CGRectMake(x, y, w, h);

the buttonWithType class methods makes a autoreleased instance, the addSubview increases retain count to two. Then the autorelease pool draining reduces it to one.

when you finally call

Code:

[oneButton removeFromSuperview];

it disappears both from the screen as well as memory because this decreases the retainCount to 0 = dealloc.

this makes since to me but it is still not working I'm using .xibs to create my application so the button is already created and linked via interface builder and i added the code

Code:

 [answerOne setTitle:@"text" forState:UIControlStateNormal];

but the text still does not show up.... very strange to me because the program still functions normally like it is just skipping that line of code? should i link it to a label in the accessibility section in interface builder?