Question

I am working on the basics of iOS development.

So far I have a button that on press, will show some text. But what I want to do is after it is pressed, I want it to then change the text of the button, so far this is what I have:

- (void)viewDidLoad
{
[super viewDidLoad];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
//button.backgroundColor = [UIColor redColor];
button.titleLabel.textColor=[UIColor blackColor];
button.frame = CGRectMake(25, 100, 275, 60);
[button setTitle:@"Press this button to reveal the text!" forState:UIControlStateNormal];
[button addTarget:self action:@selector(button_method:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:button];
// Do any additional setup after loading the view, typically from a nib.
}

- (void)button_method:(UIButton *)sender {
NSString *test = @"I am learning Objective-C for the very first time! Also, this is my first ever variable!";
// handle button press
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(25, 25, 275, 60)];
label.text = test;
label.numberOfLines = 0;
label.lineBreakMode = UILineBreakModeWordWrap;
//label.lineBreakMode = NSLineBreakByWordWrapping; //iOS 6 only
[self.view addSubview:label];
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

When I try adding [button setTitle:@"You pressed the button"]; to button_method

This doesn’t work… why? And how would I make it work?

Answer 1

When I try adding [button setTitle:@"You pressed the button"]; to button_method, it doesn’t work… why?

Because that method is nonexistent on UIButton.

And how would I make it work?

By using a method that UIButton actually responds to. For example:

[sender setTitle:@"You pressed the button" forState:UIControlStateNormal];

And read the relevant documentation, please.