按日期的 2 个属性对对象数组进行排序

Question

我有一个 NSArray 个 CoreData 个对象，里面有两个属性：月和年。我想按年然后按月对数组进行排序。

DbDate 1: month: 04 year: 2010

DbDate 2: month: 04 year: 2012

DbDate 3: month: 06 year: 2011

DbDate 4: month: 05 year: 2015

我想将它们排序到数组中：

DbDate 1 DbDate 3 DbDate 2 DbDate 4

我该怎么做？

Answer 1

    // If you have an array:
NSArray *arrayOfObject;

NSSortDescriptor *sortByYear = [NSSortDescriptor sortDescriptorWithKey:@"year" ascending:YES];
NSSortDescriptor *sortByMonth = [NSSortDescriptor sortDescriptorWithKey:@"month" ascending:YES];
NSArray *sorts = @[sortByYear, sortByMonth];

NSArray *orderedArray = [arrayOfObject sortedArrayUsingDescriptors:sorts];

// If you want fetch the object ordered, from Core Data.
NSFetchRequest  *yourFetchReques = [[NSFetchRequest alloc] init];
// Set your entity...
[yourFetchReques setSortDescriptors:sorts];
// .... Your code to make the request...