Create a simple rounded rectangle UIButton programmatically.

UIButton Programmatically.m

// Create a standard UIButton programmatically using convenience method
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

// Set the location (x,y) and size (width,height) of the button
button.frame = CGRectMake(100,100,300,50);  

// Add a button title
[button setTitle:@"My Button" forState:UIControlStateNormal];

// Create the target-action for the touch event
[button addTarget:self 
           action:@selector(buttonTouched:)
 forControlEvents:UIControlEventTouchUpInside];