Question

我正在从C ++实例创建Objective C类的实例。问题是，当试图获取某些变量的值时（在obj c实例中）我总是得到0.有些NSLog也被忽略了！：

目标C类： InAppPurchaseManager.h

@interface InAppPurchaseManager : NSObject <SKProductsRequestDelegate, SKPaymentTransactionObserver>{
    SKProduct *proUpgradeProduct;
    SKProductsRequest *productsRequest;
@public
    int finishedPurchaseProcess;
}
- (int)hasFinishedPurchaseProcess;
- (void)purchase;
@end

InAppPurchaseManager.m

@implementation InAppPurchaseManager
- (void)purchase{
    finishedPurchaseProcess=1;
}
- (int)hasFinishedPurchaseProcess{
    NSLog(@"STORE: HELLO THERE");   
    return finishedPurchaseProcess;
}

testApp.h class testApp：public ofxiPhoneApp { 上市： void goToStoreFromMenu（）; void checkPurchase（）; InAppPurchaseManager * theStore; }

testApp.mm

// First I call ghis function
void testApp::goToStoreFromMenu(){  
    InAppPurchaseManager* theStore = [[InAppPurchaseManager alloc] init];
    [theStore purchase];
}

// And then this function
void testApp::checkPurchase(){  
    cout << "Finished? " << [theStore hasFinishedPurchaseProcess] << "\n";
}

结果总是完成？ 0 ，即使我在购买中将其设置为1。此外 NSLog（@“STORE：HELLO THERE”）; 被忽略

我不明白发生了什么

Answer 1

在goToStoreFromMenu中，声明一个名为theStore的新局部变量。在checkPurchase中，您引用了一些具有相同名称的其他变量。 goToStoreFromMenu函数初始化局部变量，该变量在函数末尾超出范围。您需要初始化最终在checkPurchase中引用的相同变量。

从C ++类调用变量到Objective C类

1 个答案: