Question

我有一个自定义对象，如：

#import <Foundation/Foundation.h>

@interface Store : NSObject{
    NSString *name;
    NSString *address;
}

@property (nonatomic, retain) NSString *name;
@property (nonatomic, retain) NSString *address;

@end

我有一个包含Store对象的NSMutableArray（storeArray）数组：

store1 = [[Store alloc] init];
store1.name = @"Walmart";    
store1.address = @"walmart address here..";

store2 = [[Store alloc] init];
store2.name = @"Target";
store2.address = @"Target address here..";

store3 = [[Store alloc] init];
store3.name = @"Apple Store";
store3.address = @"Apple store address here..";

//add stores to array
storeArray = [[NSMutableArray alloc] init];
[storeArray addObject:store1];
[storeArray addObject:store2];
[storeArray addObject:store3];

我的问题是如何按商店名称对数组进行排序？我知道我可以使用这一行按字母顺序对数组进行排序：

[nameOfArray sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];

如何将此应用于Store类的商店名称？

Answer 1

NSSortDescriptor *sortDescriptor =
    [NSSortDescriptor sortDescriptorWithKey:@"name"
                                  ascending:YES
                                   selector:@selector(caseInsensitiveCompare:)];
[nameOfArray sortedArrayUsingDescriptors:@[sortDescriptor]];

相关文档：

Answer 2

Regexident's answer基于NSArrays，NSMutableArray的相应就地排序将是-sortUsingDescriptors:

[storeArray sortUsingDescriptors:
                    [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"name" 
                                                                           ascending:YES 
                                                                            selector:@selector(caseInsensitiveCompare:)]]];

现在storeArray it-self将被排序。

如何按字母顺序对NSMutableArray中的自定义对象字段进行排序？

2 个答案: