main函数：
1 //
2 // main.m
3 // NSArray排序
4 //
5 // Created by dingxiaowei on 13-5-13.
6 // Copyright (c) 2013年 dingxiaowei. All rights reserved.
7 //
8
9 #import <Foundation/Foundation.h>
10 #import "Student.h"
11 #pragma mark - 派生出新数组
12 void newArray(){
13 NSArray *array1=[NSArray arrayWithObjects:@"1",@"2", nil];
14 NSArray *array2=[array1 arrayByAddingObject:@"3"];//添加元素
15 NSLog(@"array1:%@\narray2:%@",array1,array2);
16
17 NSArray *array3=[array1 arrayByAddingObjectsFromArray:[NSArray arrayWithObjects:@"4",@"5",@"6",nil]]; //将后面一个array附加z在array1的前面
18 NSLog(@"array3:%@",array3);
19
20 //截取array中的元素
21 NSRange range=NSMakeRange(2, 2);//从第三个位置截取两个范围
22 NSArray *array4=[array3 subarrayWithRange:range];//截取数组元素
23 NSLog(@"截取后的数组是：%@",array4);
24
25
26 }
27
28 #pragma mark - 数组的其他用法
29 void arrayOther(){
30 NSArray * array=[NSArray arrayWithObjects:@"1",@"2",@"3",@"4",nil];
31 //用符号将数组拼接成字符串
32 NSString *str=[array componentsJoinedByString:@","];
33 NSLog(@"str=%@",str);
34
35 //将数组写入到文件
36 NSString *path=@"/Users/dingxiaowei/Desktop/array.xml";
37 [array writeToFile:path atomically:YES];//原子性就是等全部加载到文件中再写入
38 NSLog(@"文件写入成功");
39 //从文件中读取内容（文件格式由严格的要求）
40 NSArray *arrayRead=[NSArray arrayWithContentsOfFile:path];
41 NSLog(@"读取文件的内容：%@",arrayRead);
42 NSLog(@"文件读取成功");
43 }
44
45 #pragma mark - 数组排序
46 void arraySort1(){
47 NSArray * array=[NSArray arrayWithObjects:@"5",@"2",@"3",@"4",nil];
48 //指定元素的比较方法 数组中元素之间diao
49 NSArray *newArray=[array sortedArrayUsingSelector:@selector(compare:)];//返回一个新的排序后的数组，原来的那个数组不可变 依次调用compare方法
50 NSLog(@"排序后的数组：%@",newArray);
51 }
52 #pragma mark - 数组排序2(对对象进行排序)
53 void arraySort2(){
54 Student *stu1=[Student initeWithFirstName:@"xiaowei" andLastName:@"ding"];
55 Student *stu2=[Student initeWithFirstName:@"lianjie" andLastName:@"li"];
56 Student *stu3=[Student initeWithFirstName:@"xiaolong" andLastName:@"ding"];
57 Student *stu4=[Student initeWithFirstName:@"pengyu" andLastName:@"han"];
58
59 NSArray *array=[NSArray arrayWithObjects:stu1,stu2,stu3,stu4,nil];
60 //按照学生的姓名进行排序
61 NSArray *newArray=[array sortedArrayUsingSelector:@selector(compareStudent:)];
62 NSLog(@"排序后的学生数组是：%@",newArray);
63 }
64 #pragma mark - block排序
65 void arraySort3(){
66 Student *stu1=[Student initeWithFirstName:@"xiaowei" andLastName:@"ding"];
67 Student *stu2=[Student initeWithFirstName:@"lianjie" andLastName:@"li"];
68 Student *stu3=[Student initeWithFirstName:@"xiaolong" andLastName:@"ding"];
69 Student *stu4=[Student initeWithFirstName:@"pengyu" andLastName:@"han"];
70
71 NSArray *array=[NSArray arrayWithObjects:stu1,stu2,stu3,stu4,nil];
72 //利用block进行排序
73 NSArray *newArray=[array sortedArrayUsingComparator:^NSComparisonResult(Student * obj1, Student * obj2) {
74 //先按照姓氏排序
75 NSComparisonResult *result=[obj1.lastName compare:obj2.lastName];
76 //如果由相同的姓，则比较名
77 if(result==NSOrderedSame)
78 {
79 result=[obj1.firstName compare:obj2.firstName];
80 }
81 return result;
82 }];
83 NSLog(@"排序后的学生数组是：%@",newArray);
84 }
85 #pragma mark - 带有Book类的学生进行排序
86 void arraySort4(){
87 Student *stu1=[Student initeWithFirstName:@"xiaowei" andLastName:@"ding" andBookName:@"book1"];
88 Student *stu2=[Student initeWithFirstName:@"lianjie" andLastName:@"li" andBookName:@"book2"];
89 Student *stu3=[Student initeWithFirstName:@"xiaolong" andLastName:@"ding" andBookName:@"book2"];
90 Student *stu4=[Student initeWithFirstName:@"pengyu" andLastName:@"han" andBookName:@"book1"];
91
92 NSArray *array=[NSArray arrayWithObjects:stu1,stu2,stu3,stu4,nil];
93 //1.先按照书名进行排序
94 //排序描述类
95 //先按照书进行排序
96 NSSortDescriptor *bookNameDes=[NSSortDescriptor sortDescriptorWithKey:@"book.name" ascending:YES];//YES代表升序 第一个参数跟类的成员名要一致 这儿写成book.name是因为Student对象本身就有个Book*类型的book成员，然而book又有个name属性
97 //再按照姓进行排序
98 NSSortDescriptor *lastNameDes=[NSSortDescriptor sortDescriptorWithKey:@"lastName" ascending:YES];//YES代表升序 //这儿的lastName要跟前面的成员名一致及propert里面的lastName一致
99 //再按照名进行排序
100 NSSortDescriptor *firstNameDes=[NSSortDescriptor sortDescriptorWithKey:@"firstName" ascending:YES];//YES代表升序
101
102 //类名排序类
103 NSArray *desc=[NSArray arrayWithObjects:bookNameDes,lastNameDes,firstNameDes,nil];
104 NSArray *array2=[array sortedArrayUsingDescriptors:desc];//按照那个排序类里面的成员依次进行排序
105 NSLog(@"未排序之前的成员顺序是:%@",array);
106 NSLog(@"排序后的成员(先按书名排序，后按照姓名排序)：%@",array2);
107 }
108 int main(int argc, const char * argv[])
109 {
110
111 @autoreleasepool {
112
113 // newArray();
114 // arrayOther();
115 // arraySort1();
116 // arraySort2();
117 // arraySort3();
118 arraySort4();
119 }
120 return 0;
121 }
Student.h
1 #import <Foundation/Foundation.h> 2 3 @class Book; 4 5 6 @interface Student : NSObject 7 @property(nonatomic,retain) NSString *firstName; //名 8 @property(nonatomic,retain) NSString *lastName; //姓 9 @property(nonatomic,retain) Book *book;//这是一本书 10 //初始化带有姓名的学生 11 +(id)initeWithFirstName:(NSString *) firstName andLastName:(NSString *)lastName; 12 //初始化一个拥有书名且由姓名的学生 13 +(id)initeWithFirstName:(NSString *) firstName andLastName:(NSString *)lastName andBookName:(NSString *)bookName; 14 //设置一个比较函数 返回值为NSComparisonResult 15 -(NSComparisonResult)compareStudent:(Student *)stu; 16 @end
Student.m
1 //
2 // Student.m
3 // NSArray排序
4 //
5 // Created by dingxiaowei on 13-5-13.
6 // Copyright (c) 2013年 dingxiaowei. All rights reserved.
7 //
8
9 #import "Student.h"
10 #import "Book.h"
11 @implementation Student
12 //初始化带有姓名的学生
13 +(id)initeWithFirstName:(NSString *)firstName andLastName:(NSString *)lastName{
14 Student *stu=[[[Student alloc] init] autorelease];
15 stu.firstName=firstName;
16 stu.lastName=lastName;
17 return stu;
18 }
19 //初始化一个拥有书名且由姓名的学生
20 +(id)initeWithFirstName:(NSString *)firstName andLastName:(NSString *)lastName andBookName:(NSString *)bookName{
21 Student *stu=[Student initeWithFirstName:firstName andLastName:lastName];
22 stu.book=[Book bookWithName:bookName];
23 return stu;
24 }
25 //实现比较方法
26 -(NSComparisonResult)compareStudent:(Student *)stu{
27 //先按照姓氏排序
28 NSComparisonResult *result=[self.lastName compare:stu.lastName];
29 //如果由相同的姓，则比较名
30 if(result==NSOrderedSame)
31 {
32 result=[self.firstName compare:stu.firstName];
33 }
34 return result;
35 }
36 //重新实现description方法
37 -(NSString *)description{
38 return [NSString stringWithFormat:@"[%@ %@-%@]",self.lastName,self.firstName,self.book.name];
39 }
40 -(void)dealloc{
41 [_firstName release];
42 [_lastName release];
43
44 [super dealloc];
45 }
46 @end
Book.h
1 #import <Foundation/Foundation.h> 2 3 @interface Book : NSObject 4 @property(nonatomic,retain)NSString *name; 5 +(id)bookWithName:(NSString *)name; 6 @end
Book.m
1 #import "Book.h"
2
3 @implementation Book
4 //快速创建对象
5 +(id)bookWithName:(NSString *)name{
6 Book *book=[[[Book alloc] init] autorelease];
7 book.name=name;
8 return book;
9 }
10 //释放对象
11 -(void)dealloc{
12 [_name release];
13 [super dealloc];
14 }
15 @end
运行结果
1 2013-05-14 21:21:22.339 NSArray排序[492:303] 未排序之前的成员顺序是:( 2 "[ding xiaowei-book1]", 3 "[li lianjie-book2]", 4 "[ding xiaolong-book2]", 5 "[han pengyu-book1]" 6 ) 7 2013-05-14 21:21:22.345 NSArray排序[492:303] 排序后的成员(先按书名排序，后按照姓名排序)：( 8 "[ding xiaowei-book1]", 9 "[han pengyu-book1]", 10 "[ding xiaolong-book2]", 11 "[li lianjie-book2]" 12 )
时间： 2024-09-12 19:11:15