在我的SKProductRequest期间，我的UIButtons和UILabels变为零。 （XCODE 7）

Question

第一次使用XCODE和Objective C.在我的SKProductRequest方法中，我的UIButtons和UILabels出现问题。

下面是我的ShopViewController.m，最初调用我的3个UIButtons和我的UILabel。在viewDidLoad中，我的UIButtons和Label都有内容。

我的Shop页面正确加载但是一旦调用ProductsRequest方法，UIButtons和UILabels就变为零，不知道为什么。所有项目都是.h文件中的（强大的，非原子的）属性，并且已链接到ShopViewController中的引用Outlets。任何帮助都非常感谢。

产品请求下方的ShopViewController.m是使用GetProductInfo方法生成的。当我按下主游戏viewController上的购买按钮时，从我的* homeViewController调用。

#import "ShopViewController.h"
#import "ViewController.h"

@interface ShopViewController ()
@property (strong, nonatomic) ViewController *homeViewController;

@end

@implementation ShopViewController
@synthesize fvProductTitle;

- (void)viewDidLoad {
[super viewDidLoad];
_fvBuyButton.enabled = YES;
_ddBuyButton.enabled = NO;
_bundleBuyButton.enabled = NO;

fvProductTitle.text = @"don't read this";
}

- (IBAction)buyFVProduct:(id)sender {
SKPayment *payment = [SKPayment paymentWithProduct:_fvProduct];
[[SKPaymentQueue defaultQueue] addPayment:payment];
}

- (IBAction)buyDDProduct:(id)sender {
SKPayment *payment = [SKPayment paymentWithProduct:_ddProduct];
[[SKPaymentQueue defaultQueue] addPayment:payment];
}

- (IBAction)buyBundleProduct:(id)sender {
SKPayment *payment = [SKPayment paymentWithProduct:_bundleProduct];
[[SKPaymentQueue defaultQueue] addPayment:payment];
}

- (void) getProductInfo:(ViewController *) viewController {
_homeViewController = viewController;

if ([SKPaymentQueue canMakePayments])
{
    SKProductsRequest *request = [[SKProductsRequest alloc]
                                  initWithProductIdentifiers:
                                  [NSSet setWithObjects:self.bundleProductID, self.ddProductID, self.fvProductID, nil]];
    request.delegate = self;

    [request start];
}
else{
    _fvProductDescription.text = @"please enable app purchases";
}
}

#pragma mark -
#pragma mark SKProductsRequestDelegate

-(void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response
{
NSArray *products = response.products;

if (products.count != 0)
{
    _fvProduct = products[2];
    _fvBuyButton.enabled = YES;
    fvProductTitle.text = _fvProduct.localizedTitle;

    _ddProduct = products[1];
    _ddBuyButton.enabled = YES;
    _ddProductTitle.text = _ddProduct.localizedTitle;

    _bundleProduct = products[0];
    _bundleBuyButton.enabled = YES;
    _bundleProductTitle.text = _bundleProduct.localizedTitle;

} else {
    fvProductTitle.text = @"Full Version Product not found";
    _ddProductTitle.text = @"Dirty Dozen Product not found";
    _bundleProductTitle.text = @"Bundle Product not found";
}

products = response.invalidProductIdentifiers;

}

#pragma mark -
#pragma mark SKPaymentTransactionObserver

-(void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions
{
for (SKPaymentTransaction *transaction in transactions)
{
    switch (transaction.transactionState) {
        case SKPaymentTransactionStatePurchased:
            [self unlockFullVersion];
            [[SKPaymentQueue defaultQueue]
             finishTransaction:transaction];
            break;

        case SKPaymentTransactionStateFailed:
            NSLog(@"Transaction Failed");
            [[SKPaymentQueue defaultQueue]
             finishTransaction:transaction];
            break;

        default:
            break;
    }
}
}

这是我的ShopViewController.h，用于查看我已设置的属性。

#import <UIKit/UIKit.h>
#import <StoreKit/StoreKit.h>

@interface ShopViewController : UIViewController   <SKPaymentTransactionObserver, SKProductsRequestDelegate> {

}

@property (nonatomic) BOOL *isFullVersionAvailable;

// Store Kit
@property (strong, nonatomic) SKProduct *fvProduct;
@property (strong, nonatomic) SKProduct *ddProduct;
@property (strong, nonatomic) SKProduct *bundleProduct;

@property (strong, nonatomic) NSString *fvProductID;
@property (strong, nonatomic) NSString *ddProductID;
@property (strong, nonatomic) NSString *bundleProductID;

@property (strong, nonatomic) IBOutlet UIButton *fvBuyButton;
@property (strong, nonatomic) IBOutlet UIButton *ddBuyButton;
@property (strong, nonatomic) IBOutlet UIButton *bundleBuyButton;

@property (strong, nonatomic) IBOutlet UILabel *fvProductTitle;
@property (strong, nonatomic) IBOutlet UILabel *ddProductTitle;
@property (strong, nonatomic) IBOutlet UILabel *bundleProductTitle;
@property (strong, nonatomic) IBOutlet UITextView *fvProductDescription;

- (IBAction)buyFVProduct:(id)sender;
- (IBAction)buyDDProduct:(id)sender;
- (IBAction)buyBundleProduct:(id)sender;
- (void)getProductInfo:(UIViewController *)viewController;

@end

下面是我的ViewController.m，我的purchaseItem是用户按下以转换到商店页面并调用getProductInfo方法的内容。

- (IBAction)purchaseItem:(id)sender {
shopViewController.fvProductID = @"BurnsyBadges.FullVersion";
shopViewController.ddProductID = @"BurnsyBadges.DirtyDozen";
shopViewController.bundleProductID = @"BurnsyBadges.Bundle";

[shopViewController getProductInfo: self];
}

Answer 1

回答我自己的问题。几个星期前我已经弄清楚了，并没有得到更新。但是为了让多个ViewControllers正确访问产品购买页面，我必须纠正一些事情。

要使一页工作，我需要将NavigationController添加到我的所有ViewControllers。