[英]Sorting an array of Objective-c objects
So I have a custom class Foo
that has a number of members: 所以我有一个自定义类
Foo
,它有许多成员:
@interface Foo : NSObject {
NSString *title;
BOOL taken;
NSDate *dateCreated;
}
And in another class I have an NSMutableArray
containing a list of these objects. 在另一个类中,我有一个
NSMutableArray
其中包含这些对象的列表。 I would very much like to sort this array based on the dateCreated
property; 我非常想根据
dateCreated
属性对这个数组进行排序; I understand I could write my own sorter for this (iterate the array and rearrange based on the date) but I was wondering if there was a proper Objective-C way of achieving this? 我知道我可以为此编写自己的分类器(迭代数组并根据日期重新排列)但我想知道是否有一个正确的Objective-C方法来实现这一目标?
Some sort of sorting mechanism where I can provide the member variable to sort by would be great. 我可以提供成员变量排序的某种排序机制会很棒。
In C++ I used to overload the < = > operators and this allowed me to sort by object, but I have a funny feeling Objective-C might offer a nicer alternative? 在C ++中我曾经重载<=>运算符,这允许我按对象排序,但我有一种有趣的感觉Objective-C可能提供更好的选择?
Many thanks 非常感谢
That's quite simple to do. 这很简单。
First, in your Foo object, create a method 首先,在您的Foo对象中,创建一个方法
- (NSComparisonResult) compareWithAnotherFoo:(Foo*) anotherFoo;
Which will return 哪个会回归
[[self dateCreated] compare:[anotherFoo dateCreated]];
In the end, call on the array 最后,调用数组
[yourArray sortUsingSelector:@selector(compareWithAnotherFoo:)];
Hope this helps, Paul 希望这有帮助,保罗
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