UIButton

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    btn.frame = CGRectMake(100, 100, 100, 40);
    
    [btn setTitle:@"button" forState:UIControlStateNormal];
    [btn setTitle:@"button01" forState:UIControlStateHighlighted];
    
    btn.backgroundColor = [UIColor grayColor];
    [btn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    
    btn.titleLabel.font = [UIFont systemFontOfSize:18];
    
    [btn addTarget:self action:@selector(pressBtn) forControlEvents:UIControlEventTouchUpInside];
    
    [self.view addSubview:btn];