使用定制的NSMutableDictionary方法对NSMutableArray排序

首先，给NSMutableDictionary建一个分类，里面加上自定义的排序方法。

 

头文件：

 

#import <Foundation/Foundation.h>

@interface NSMutableDictionary(NSMutableDictionaryCompare)

- (NSComparisonResult)compareWithDictionary:(NSMutableDictionary *) dic;

@end

 

实现文件：

 

#import "CustomCompare.h"

@implementation NSMutableDictionary(NSMutableDictionaryCompare)

- (NSComparisonResult)compareWithDictionary:(NSMutableDictionary *) dic{
	NSMutableDictionary *dic1 = self;
	NSString *name1 = [dic1 objectForKey:@"Name"];
	NSString *name2 = [dic objectForKey:@"Name"];
	return [name2 compare:name1];
}

@end

 

示例：

 

NSMutableDictionary *dic1 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Michael", @"Name", @"26", @"Age", nil];
NSMutableDictionary *dic2 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Eric", @"Name", @"24", @"Age", nil];
NSMutableDictionary *dic3 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Emilla", @"Name", @"25", @"Age", nil];
NSMutableDictionary *dic4 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Josh", @"Name", @"32", @"Age", nil];
NSMutableDictionary *dic5 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Echo", @"Name", @"22", @"Age", nil];
NSMutableArray *array = [[NSMutableArray alloc] initWithObjects:dic1, dic2, dic3, dic4, dic5, nil];
[dic1 release];
[dic2 release];
[dic3 release];
[dic4 release];
[dic5 release];
[array sortUsingSelector:@selector(compareWithDictionary:)];
NSLog(@"%@", array);
[array release];

 

示例输出：

 

{
    Age = 26;
    Name = Michael;
},
{
    Age = 32;
    Name = Josh;
},
{
    Age = 24;
    Name = Eric;
},
{
    Age = 25;
    Name = Emilla;
},
{
    Age = 22;
    Name = Echo;
}