buttons showing (null) when clicked, even when disabled - ios

Question

I have some buttons on my storyboard that I removed all text from and which I later add text to programmatically, so when the application starts the buttons are invisible. However, if a user clicks any one of the buttons, all four of the buttons show (null) in the label section of the button. I thought this might be because the buttons were enabled, so I added this code in the initWithFrame method of the subclass of UIView where the buttons are a property however it didn't change anything.
Furthermore, I don't understand why clicking one of the buttons would show (null) in the label area of all four buttons.
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
self.button1.enabled= NO;
self.button2.enabled= NO;
self.button3.enabled= NO;
self.button4.enabled= NO;
}
return self;
}
I then considered that maybe this initWithFrame method isn't getting run when I thought it was. I tried in the subview of UIView and didn't change result
-(id)initWithCoder:(NSCoder *)aDecoder {
if (self = [super initWithCoder:aDecoder]) {
self.answerChoice1.enabled= NO;
self.answerChoice2.enabled= NO;
self.answerChoice3.enabled= NO;
self.answerChoice4.enabled= NO;
}
return self;
}
Can you explain why all four buttons are showing (null) if I click on any one of them?

Answer 1

it depends i think on the selector the button is calling, and also whether you are able to distinguish your buttons.
you can use button.tag property to distinguish between your buttons as below:
// declare and allocate
UIButton* button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
// set frame
button1.frame = frameButton1;
// add to view
[self.view addSubview: button1];
// properties from docs
// button1.enabled or button1.hidden or button1 setTitle.. here
// add selector
[button1 addTarget:self selector:#selector(buttonAction:) ..UIEventTouchUpInside];
// add identifier, integer in this case
button1.tag = 1;
// repeat for other buttons
// in your selector
- (void)buttonAction:(UIButton *)sender
{
// identify button
switch (sender.tag) {
case 0:
// perform action
[self doAction];
break;
//..
}
// perform shared actions
}