[[SKPaymentQueue defaultQueue] addPayment:payment]崩溃

解决：
添加内购代理方法：

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

参考来自https://www.jianshu.com/p/1b0956102860