使用Storyboard呈现视图控制器

Question

我已经按照教程将In App Purchase添加到我的应用中。有2次观看次数：

1. 按钮“购买商品”
2. 屏幕出现，允许用户选择产品

我已经完全添加了代码但在教程中他们使用的是XIB文件，但我使用的是Storyboard。我的“购买项目”按钮的代码如下所示：

- (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];

}

我遇到的问题是，当点击按钮时，会出现黑屏，但我想要BuysedViewController显示

我需要改变什么吗？

编辑：

使用已编辑的代码但收到错误：

- (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

使用故事板，你应该给出如图中的标识符： 点击你的viewController和'身份检查员'

在此示例中，自定义类应为：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

试试这个

_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];