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];