iOS内购二次进入购买界面[[SKPaymentQueue defaultQueue] addPayment:payment]崩溃？

记住，每次交易结束时要removeTransactionObserver啊

//交易结束
- (void)paymentQueue:(SKPaymentQueue *)queue removedTransactions:(NSArray *)transactions {
    
    NSLog(@"交易结束");
    self.view.userInteractionEnabled = YES;
    [[SKPaymentQueue defaultQueue] removeTransactionObserver:self];
    
}