本文介绍了如何建立辅助NSSortDescriptor排序键？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已经按排序键 lastName 成功排序了我的数据，但我想知道如何按 lastName ，然后按 firstName 。这是我用来排序的代码 lastName
I have successfully sorted the data I have by my sort key lastName, but I want to know how to sort by lastName, and then by firstName. Here is the code I used to sort by lastName
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"firstName" ascending:YES];
[request setSortDescriptors:[NSArray arrayWithObject:sortDescriptor]];
如何添加 firstName的辅助排序键？
推荐答案
NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"firstName" ascending:YES];
NSSortDescriptor *sortDescriptor2 = [[NSSortDescriptor alloc] initWithKey:@"lastName" ascending:YES];
[request setSortDescriptors:[NSArray arrayWithObjects:sortDescriptor1, sortDescriptor2, nil]];
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