ios切换界面

- (void)viewDidLoad {
    [super viewDidLoad];
    button1 = [[UIButton alloc]initWithFrame:CGRectMake(50, 50, 100, 50)];
    button1.backgroundColor = [UIColor redColor];
    [button1 addTarget:self action:@selector(myDemoButton1:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button1];

}
- (void)myDemoButton1:(id)sender{
    view2 = [[ViewController2 alloc]init];
// view2 = [self.storyboard instantiateViewControllerWithIdentifier:@"ViewController2"];
    view2.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

    [self presentViewController:view2 animated:YES completion:nil];

}