NSArray中的数据进行排序

NSArray中的数据排序，经常是利用NSSortDescriptor。

官方文档：http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSSortDescriptor_Class/Reference/Reference.html

//组装数据
array=[[NSMutableArray alloc] initWithCapacity:11];

NSMutableDictionary *dir6=[[NSMutableDictionary alloc] initWithCapacity:1];
[dir6 setObject:@"曹磊" forKey:@"FriendName"];
[dir6 setObject:@"曹磊" forKey:@"FriendID"];
[array addObject:dir6];
[dir6 release];

NSMutableDictionary *dir=[[NSMutableDictionary alloc] initWithCapacity:1];
[dir setObject:@"王军" forKey:@"FriendName"];
[dir setObject:@"曹磊" forKey:@"FriendID"];
[array addObject:dir];
[dir release];

NSMutableDictionary *dir1=[[NSMutableDictionary alloc] initWithCapacity:1];
[dir1 setObject:@"111" forKey:@"FriendName"];
[dir1 setObject:@"曹磊" forKey:@"FriendID"];
[array addObject:dir1];
[dir1 release];

NSMutableDictionary *dir2=[[NSMutableDictionary alloc] initWithCapacity:1];
[dir2 setObject:@"王兴朝" forKey:@"FriendName"];
[dir2 setObject:@"曹磊" forKey:@"FriendID"];
[array addObject:dir2];
[dir2 release];

NSMutableDictionary *dir3=[[NSMutableDictionary alloc] initWithCapacity:1];
[dir3 setObject:@"wangjun" forKey:@"FriendName"];
[dir3 setObject:@"曹磊" forKey:@"FriendID"];
[array addObject:dir3];
[dir3 release];

NSMutableDictionary *dir4=[[NSMutableDictionary alloc] initWithCapacity:1];
[dir4 setObject:@"apk" forKey:@"FriendName"];
[dir4 setObject:@"曹磊" forKey:@"FriendID"];
[array addObject:dir4];
[dir4 release];


self.myArray=array;
[array release];
NSLog(@">>>>>>排序前>>>>>>>>");
for (int i=0; i<[self.myArray count]; i++) {
NSLog(@"%@",[[self.myArray objectAtIndex:i] objectForKey:@"FriendName"]);
}

NSSortDescriptor *sorter = [[NSSortDescriptor alloc] initWithKey:@"FriendName" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:&sorter count:1];
NSArray *sortedArray = [self.myArray sortedArrayUsingDescriptors:sortDescriptors];

[sorter release];

NSLog(@"\n\n\n\n\n>>>>>>排序后>>>>>>>>");
for (int i=0; i<[sortedArray count]; i++) {
NSLog(@"%@",[[sortedArray objectAtIndex:i] objectForKey:@"FriendName"]);
}

数据结果：

2011-04-21 18:31:36.556 sort[4041:707] >>>>>>排序前>>>>>>>>
2011-04-21 18:31:36.567 sort[4041:707] 曹磊
2011-04-21 18:31:36.571 sort[4041:707] 王军
2011-04-21 18:31:36.575 sort[4041:707] 111
2011-04-21 18:31:36.578 sort[4041:707] 王兴朝
2011-04-21 18:31:36.582 sort[4041:707] wangjun
2011-04-21 18:31:36.585 sort[4041:707] apk
2011-04-21 18:31:36.589 sort[4041:707]

>>>>>>排序后>>>>>>>>
2011-04-21 18:31:36.595 sort[4041:707] 111
2011-04-21 18:31:36.599 sort[4041:707] apk
2011-04-21 18:31:36.602 sort[4041:707] wangjun
2011-04-21 18:31:36.606 sort[4041:707] 曹磊
2011-04-21 18:31:36.610 sort[4041:707] 王兴朝
2011-04-21 18:31:36.613 sort[4041:707] 王军