当前视图控制器使用故事板

我已经按照教程添加在应用程序购买到我的应用程序。 有2个意见：

1. button到“购买项目”
2. 屏幕出现，允许用户select产品

我已经完全正确地添加了代码，但在教程中他们使用的是XIB文件，但是我正在使用Storyboard。 我的“购买商品”button的代码如下所示：

- (IBAction)PurchaseItem:(id)sender { _purchaseController = [[PurchasedViewController alloc] initWithNibName:Nil bundle:nil]; _purchaseController.productID = @"com.myapp"; [self presentViewController:_purchaseController animated:YES completion:NULL]; [_purchaseController getProductID:self]; } 

我有的问题是，当button被点击时，出现一个黑色的屏幕，但我想购买PurchasedViewController显示

我需要改变一些东西吗？

编辑：

使用编辑的代码，但得到附加的错误：

 - (IBAction)PurchaseItem:(id)sender { PurchasedViewController *purchaseContr = (PurchasedViewController *)[self.storyboard instantiateViewControllerWithIdentifier:@"menu"]; //menu is only an example purchaseContr.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; [self presentViewController:purchaseContr animated:YES completion:nil]; } 

Answer 1

对于故事板，您应该提供一个如图所示的标识符：点击viewController和“身份检查器”

在这个例子中，自定义类应该是： PurchasedViewController

这是代码：

  - (IBAction)PurchaseItem:(id)sender { PurchasedViewController *purchaseContr = (PurchasedViewController *)[self.storyboard instantiateViewControllerWithIdentifier:@"menu"]; //menu is only an example purchaseContr.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; [self presentViewController:purchaseContr animated:YES completion:nil]; } 

Answer 2

尝试这个

 _purchaseController = [[PurchasedViewController alloc] init]; _purchaseController.productID = @"com.myapp"; /* 1. Add the new VC as a child VC */ [self addChildViewController:_purchaseController]; /* 2. Add new view to source view */ [self.view addSubview:_purchaseController.view]; /* 3. Inform 'didMoveToParentViewController' to newly added view controller */ [_purchaseController didMoveToParentViewController:self]; [_purchaseController getProductID:self];