myButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, parentView.frame.size.width, parentView.frame.size.height)];
[myButton setBackgroundColor:[UIColor blackColor]];
[myButton setAlpha:0.7];
[myButton setTitle:@"Hello" forState:UIControlStateNormal];
[myButton addTarget:self action:@selector(userClicked:) forControlEvents:UIControlEventTouchUpInside];

[parentView addSubview:myButton];

-(void) userClicked:(UIButton*)button
{
    NSLog(@"USER CLICKED!!!");
    if ([NSThread isMainThread])
    {
        NSLog(@"is main thread");
    }

    [button setTitle:@"Bye" forState:UIControlStateHighlighted];
    [button setTitle:@"Bye" forState:UIControlStateNormal];
    [button setTitle:@"Bye" forState:UIControlStateSelected];

    [self someLengthyComputation];
}

USER CLICKED!!!
isMainThread

Printing description of button->_titleView:
<UIButtonLabel: 0xa4c9310; frame = (95 216; 130 22); text = 'Bye'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0xa44f080>>

button.enabled = FALSE;
[button setTitle:@"Test" forState:UIControlStateNormal];
button.enabled = TRUE;

[button setAttributedTitle:@"" forState:UIControlStateNormal];

[button setTitle:@"" forState:UIControlStateNormal];

[button setNeedsLayout];

[mybutton setTitle:@"SomeText" forState:UIControlStateNormal];
[button setNeedsLayout];
[button layoutIfNeeded];

-(IBAction)changeButtonText:(id)sender {
    if (!buttonToggled) {
        [sender setTitle:@"Initial Text" forState:UIControlStateNormal];
        buttonToggled = YES;
    } else {
        [sender setTitle:@"Alternative Text" forState:UIControlStateNormal];
        buttonToggled = NO;
    }
}

@selector(userClicked:)

-(void)userTapOnTapToRefreshView:(UIButton*)button

-(void)userClicked:(id)sender
{
    [(UIButton*)sender setTitle:@"Bye" forState:UIControlStateNormal];
}

[parentView myButton];

[parentView addSubview:myButton];

[button setTitle:title forState:UIControlStateNormal];
[button setTitle:title forState:UIControlStateDisabled];

[button setTitle:@"Bye" forState:UIControlStateHighlighted];

[button setTitle:@"Bye" forState:UIControlStateSelected];

-(void) userClicked
{
    NSLog(@"USER CLICKED!!!");
    if ([NSThread isMainThread])
    {
        NSLog(@"is main thread");
    }

    [myButton setTitle:@"Bye" forState:UIControlStateNormal];
}

[button setNeedsLayout];
[button layoutIfNeeded];

-(void) userClicked:(UIButton*)button
{
    NSLog(@"USER CLICKED!!!");
    if ([NSThread isMainThread])
    {
        NSLog(@"is main thread");
    }

    [button setTitle:@"Bye" forState:UIControlStateHighlighted];
    [button setTitle:@"Bye" forState:UIControlStateNormal];
    [button setTitle:@"Bye" forState:UIControlStateSelected];
    dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
        [self someLengthyComputation];
    });
}

[myButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

[myButton setTitle:@"SomeText" forState:UIControlStateNormal];.

button.setTitle("My title", for: .normal)

button.setAttributedTitle(<AttributedString>, for: .normal)

NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] initWithString:@" new Test "];

[button setAttributedTitle:attString forState:UIControlStateNormal];

[button setNeedsLayout];
[button layoutIfNeeded];

[button setAttributedTitle:[NSAttributedString new] forState:UIControlStateNormal];

[button setTitleColor:[any_color] forState:UIControlStateNormal];

@property(nonatomic,strong) UIButton* myButton;

self.myButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, parentView.frame.size.width, parentView.frame.size.height)];
[_myButton setBackgroundColor:[UIColor blackColor]];
...

@implementation myViewController
{
    UIButton* myButton;
}

-(void)createButton
{
    myButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, parentView.frame.size.width, parentView.frame.size.height)];
    [myButton setBackgroundColor:[UIColor blackColor]];
    ...
}

...