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];