【转】NSArray中的数据进行排序

转自：http://blog.csdn.net/csharpjasp/article/details/6690467

 

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