按 2 级深度的键值关系对 NSArray 进行排序
我有一个 UILocalNotification 对象的 NSArray，需要根据 UILocalNotification 的 userInfo 属性（一个 NSDictionary）中的键进行排序。我知道如何按一层深的值对 NSArray 进行排序，例如 NSDictionaries 数组中的键，但两层深我迷失了。我想做这样的事情：伪代码：
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"userInfo.personName" ascending:YES];
//the personName key within the userInfo NSDictionary property of a given UILocalNotification
NSArray *sortDescriptors = [[[NSArray alloc] initWithObjects:&sortDescriptor count:1] autorelease];
NSMutableArray *sortedArray = [[[NSMutableArray alloc] initWithArray:[[UIApplication sharedApplication] scheduledLocalNotifications]] autorelease];
[sortedArray sortUsingDescriptors:sortDescriptors];
I have an NSArray of UILocalNotification objects that I need to sort according to a key within the UILocalNotification's userInfo property, which is an NSDictionary. I know how to sort NSArrays by a value that is one level deep, e.g., a key within an array of NSDictionaries, but two levels deep I'm lost. I want to do something like this is psuedo-code:
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"userInfo.personName" ascending:YES];
//the personName key within the userInfo NSDictionary property of a given UILocalNotification
NSArray *sortDescriptors = [[[NSArray alloc] initWithObjects:&sortDescriptor count:1] autorelease];
NSMutableArray *sortedArray = [[[NSMutableArray alloc] initWithArray:[[UIApplication sharedApplication] scheduledLocalNotifications]] autorelease];
[sortedArray sortUsingDescriptors:sortDescriptors];
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你试过你的代码吗？苹果的文档（此处）表示它接受关键路径，而不仅仅是键。
Did you try your code? Apple's document (here) says it accepts key paths, not just keys.