UIButton

 1     UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

 2     CGRect frame = CGRectMake(40, 180, 240, 32);

 3     

 4     btn.frame = frame;

 5     [btn addTarget:self action:@selector(btnFun) forControlEvents:UIControlEventTouchUpInside];

 6     

 7     [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

 8     [btn.titleLabel setFont:[UIFont systemFontOfSize:18.0]];

 9     btn.backgroundColor = [UIColor greenColor];

10     

11     btn.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;

12     [btn setTitle:@"Click" forState:UIControlStateNormal];

13     btn.showsTouchWhenHighlighted = YES;

14     

15     [self.view addSubview:btn];