使用谓词过滤数组

Question

我需要使用状态等于“U”过滤以下数组，并且我使用了以下内容。

 NSArray *result = [alertModified.senders filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(subscriptions.status = %@)",@"U"]];

但我得到空数组。

请帮我过滤一下吗？

数组字符串：

(senderCode =  CPFB, senderName = CPFB, forSenderLevel = 0, subscriptions = (
"correspondenceListId = 102,status = S,senderCode = AA,subject = Letter,retentionPeriod = 0, uniqueBillIdentifier = (null),senderResponseStatus = (null),subscriptionDate = ,effectiveDate = ",
"correspondenceListId = 103,status = U,senderCode = BB,subject = Nomination Letters,retentionPeriod = 0, uniqueBillIdentifier = (null),senderResponseStatus = (null),subscriptionDate = ,effectiveDate = ",
"correspondenceListId = 104,status = U,senderCode = AA,subject = Yearly statements,retentionPeriod = 0, uniqueBillIdentifier = (null),senderResponseStatus = (null),subscriptionDate = ,effectiveDate = ",
"correspondenceListId = 105,status = U,senderCode = BB,subject = All Future Letters,retentionPeriod = 0, uniqueBillIdentifier = (null),senderResponseStatus = (null),subscriptionDate = ,effectiveDate = "))

Answer 1

在您的示例中，您应该过滤订阅列表本身，而不是整个发件人。您必须将过滤器应用于每个发件人。尝试将过滤行更改为此并检查它是否为您提供结果：

 NSArray *result = [[alertModified.senders objectAtIndex:0].subscriptions filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(status = %@)",@"U"]];