动态添加view

- (void)viewDidLoad

{

    [superviewDidLoad];

    

    self.view.backgroundColor=[UIColorwhiteColor];

    

    //添加UIImageView

    

     imageView=[[UIImageViewalloc] initWithFrame:self.view.frame];

    //添加按钮

   CGRect buttonRect = CGRectMake(100, 200, 30, 10);

    UIButton *recogizeBtn = [UIButtonbuttonWithType:UIButtonTypeCustom];

    recogizeBtn.frame = buttonRect;

    [recogizeBtnsetTitle:@"new Button" forState:UIControlStateNormal];

    [recogizeBtn setBackgroundColor: [UIColorclearColor]];

    [recogizeBtn addTarget:selfaction:@selector(recognize:)forControlEvents:UIControlEventTouchUpInside];

    [imageViewaddSubview:recogizeBtn];

    

    [self.viewaddSubview:imageView];

// Do any additional setup after loading the view, typically from a nib.

}

-(IBAction)recognize:(id)sender

{

    UIAlertView  *alertResult = [[UIAlertView alloc]initWithTitle:@"result" message:@"welcome" delegate:self cancelButtonTitle:@"ok"        otherButtonTitles:nil, nil];

    [alertResult show];

}