用代码创建按钮 - OC

实例代码：

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

//动态创建我们自己的按钮

//1.创建按钮（UIButton）
UIButton *button = [[UIButton alloc]init];

//2.设置按钮上显示的文字
[button setTitle:@"点我吧" forState:UIControlStateNormal];
[button setTitle:@"摸我干啥" forState:UIControlStateHighlighted];

//设置文字颜色
[button setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];
[button setTitleColor:[UIColor blueColor] forState:UIControlStateHighlighted];

//3.加载图片
UIImage *imgNormal = [UIImage imageNamed:@"btn_01"];
UIImage *imgHighlighted = [UIImage imageNamed:@"btn_02"];

//4.设置背景图片
[button setBackgroundImage:imgNormal forState:UIControlStateNormal];
[button setBackgroundImage:imgHighlighted forState:UIControlStateHighlighted];

//5.设置frame属性（位置和大小）
button.frame = CGRectMake(50, 50, 100, 100);

//6.通过代码为控件注册一个单机事件
[button addTarget:self action:@selector(buttonPrint) forControlEvents:UIControlEventTouchUpInside];


//7.把动态创建的控件添加到控制器的view中
[self.view addSubview:button];


}

- (void)buttonPrint{

   printf("测试打印");
}

- (void)didReceiveMemoryWarning {
   [super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end