如何循环查看本词典？

从贝宝自适应支付

{ 
    client =  { 
     environment = mock; 
     "paypal_sdk_version" = "1.0.3"; 
     platform = iOS; 
     "product_name" = "PayPal iOS SDK"; 
    }; 
    payment =  { 
     amount = "39.95"; 
     "currency_code" = USD; 
     "short_description" = "Awesome saws"; 
    }; 
    "proof_of_payment" =  { 
     "adaptive_payment" =   { 
      "app_id" = "APP-1245783590"; 
      "pay_key" = "AP-70M62356425642W"; 
      "payment_exec_status" = COMPLETED; 
      timestamp = "2012-03-03T15:53:55Z"; 
     }; 
    };

及其。最后我做这个：

- (void)verifyCompletedPayment:(PayPalPayment *)completedPayment { 

    NSDictionary *pOPDictionary = [NSDictionary dictionaryWithDictionary:completedPayment.confirmation]; 
    NSLog(@"pOPDictionary: %@",pOPDictionary); 

    NSDictionary *subDictionary = [pOPDictionary objectForKey:@"proof_of_payment"]; 
    NSDictionary *sub2Dictionary = [subDictionary objectForKey:@"adaptive_payment"]; 
    NSString *proofString = [sub2Dictionary objectForKey:@"payment_exec_status"]; 

    if ([proofString isEqualToString:@"COMPLETED"]) { 
     NSLog(@"Payment Completed Successfully"); 
    } else { 
     NSLog(@"Payment Error"); 
    } 

    NSData *confirmation = [NSJSONSerialization dataWithJSONObject:completedPayment.confirmation options:0 error:nil]; 

}

是否有更有效的方式来获得从字典词典的字典中的键？我只是真的需要那个钥匙。所以我不认为我应该循环或循环通过其他人。

来源

2013-04-09 marciokoko

有两个2个不同的可能性，如何可以简化代码。您可以使用“现代Objective-C的下标语法”（见http://clang.llvm.org/docs/ObjectiveCLiterals.html了解更多信息）：

NSDictionary *pOPDictionary = completedPayment.confirmation; 
NSString *proofString = pOPDictionary[@"proof_of_payment"][@"proof_of_payment"][@"payment_exec_status"];

或键值编码：

NSDictionary *pOPDictionary = completedPayment.confirmation; 
NSString *proofString = [pOPDictionary valueForKeyPath:@"proof_of_payment.proof_of_payment.payment_exec_status"];

我不认为有这样的优点一个在另一个之上，它只是一个你选择哪一个味道的问题。

来源

2013-04-13 19:23:16

如何循环查看本词典？

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