题目：解析根据文件里面的内容，读入一个城市，输出所在首字母
比如读入 长春 输出 c
读入 北京 输出 b
从如下文件解析
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> 3 <plist version="1.0"> 4 <dict> 5 <key>a</key> 6 <array> 7 <string>安吉</string> 8 <string>安庆</string> 9 <string>鞍山</string> 10 <string>澳门</string> 11 </array> 12 <key>b</key> 13 <array> 14 <string>保定</string> 15 <string>宝鸡</string> 16 <string>包头</string> 17 <string>北海</string> 18 <string>北京</string> 19 <string>蚌埠</string> 20 <string>滨州</string> 21 </array> 22 <key>c</key> 23 <array> 24 <string>沧州</string> 25 <string>长春</string> 26 <string>常德</string> 27 <string>长乐</string> 28 <string>长沙</string> 29 <string>常熟</string> 30 <string>常州</string> 31 <string>潮阳</string> 32 <string>潮州</string> 33 <string>承德</string> 34 <string>成都</string> 35 <string>郴州</string> 36 <string>重庆</string> 37 <string>滁州</string> 38 <string>慈禧</string> 39 <string>从化</string> 40 </array> 41 </dict> 42 </plist>
本次思路
1.创建一个首字母和城市名称的一个类FirstLetterAndCity，其中有两个成员变量，一个位字符串类型，存储首字母，一个动态数组，存储该字母对应的所有城市。
1 //
2 // FirstLetterAndCity.h
3 // day16_OC5_城市首字母
4 //
5 // Created by qianfeng on 15/6/15.
6 // Copyright (c) 2015年 QF_Lpj. All rights reserved.
7 //
8
9 #import <Foundation/Foundation.h>
10
11 @interface FirstLetterAndCity : NSObject
12 {
13 NSString *_firstLetter; //城市首字母
14 NSMutableArray *_cityList; //城市集合
15 }
16 - (id)init;
17
18 //设置城市首字母
19 - (void)setFirstLetter:(NSString *)firstLetter;
20 - (NSString *)firstLetter;
21
22 //首字母和城市类的城市列表中添加城市
23 - (void)addCityList:(NSString *)cityName;
24 - (NSMutableArray *)cityList;
25
26
27 @end
28 ------------------------------
29 //
30 // FirstLetterAndCity.m
31 // day16_OC5_城市首字母
32 //
33 // Created by qianfeng on 15/6/15.
34 // Copyright (c) 2015年 QF_Lpj. All rights reserved.
35 //
36
37 #import "FirstLetterAndCity.h"
38
39 @implementation FirstLetterAndCity
40
41 - (id)init
42 {
43 if (self = [super init]) {
44 _firstLetter = @"";
45 _cityList = [[NSMutableArray alloc] init];
46 }
47 return self;
48 }
49
50 //设置城市首字母
51 - (void)setFirstLetter:(NSString *)firstLetter
52 {
53 _firstLetter = firstLetter;
54 }
55 - (NSString *)firstLetter
56 {
57 return _firstLetter;
58 }
59
60 //首字母和城市类的城市列表中添加城市
61 - (void)addCityList:(NSString *)cityName
62 {
63 if (![cityName isEqualToString:@""]) {
64 [self ->_cityList addObject:cityName];
65 }
66 }
67 - (NSMutableArray *)cityList
68 {
69 return _cityList;
70 }
71
72
73 @end
2.创建一个城市管理类，其中有一个动态数组的成员变量，用于存储所有FirstLetterAndCity类对象。
之后通过遍历管理类中的数组，对每一个FirstLetterAndCity对象中的数组再意义遍历，当对应的城市名称在其中有时，就返回该对象对应的城市首字母
1 //
2 // ManagerCity.h
3 // day16_OC5_城市首字母
4 //
5 // Created by qianfeng on 15/6/15.
6 // Copyright (c) 2015年 QF_Lpj. All rights reserved.
7 //
8
9 #import <Foundation/Foundation.h>
10 #import "FirstLetterAndCity.h"
11
12 #define FilePath @"/Users/qianfeng/Desktop/day16_OC5_复合类设计/day16_OC5_城市首字母/城市首字母.txt"
13
14 @interface ManagerCity : NSObject
15 {
16 NSMutableArray *_firstLetterAndCityList; //用于存储城市集合和首字母 FirstLetterAndCity 对象
17 }
18
19 - (id)init;
20
21 - (NSString *)getFileAllString:(NSString *)filePath;
22
23 //输入一个城市名称，返回对应的首字母
24 - (NSString *)getFirstLetterByCityName:(NSString *)cityName;
25
26
27 + (void)testManagerCity:(NSString *)cityName;
28
29
30
31 @end
32
33 ---------------------------------------------------
34 //
35 // ManagerCity.m
36 // day16_OC5_城市首字母
37 //
38 // Created by qianfeng on 15/6/15.
39 // Copyright (c) 2015年 QF_Lpj. All rights reserved.
40 //
41
42 #import "ManagerCity.h"
43 #import "FirstLetterAndCity.h"
44
45 //声明一个匿名类别 实现私有化
46 @interface ManagerCity ()
47
48 - (NSString *)getFLetterByCityName:(NSString *)cityName;
49
50 @end
51
52 @implementation ManagerCity
53
54 - (id)init
55 {
56 if (self = [super init]) {
57 _firstLetterAndCityList = [[NSMutableArray alloc] init];
58 }
59 return self;
60 }
61
62 //由路径生成一个字符串对象
63 - (NSString *)getFileAllString:(NSString *)filePath
64 {
65 NSString *fileContent = [[NSString alloc] initWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
66 return fileContent;
67 }
68
69 //通过城市名称获取城市首字母
70 - (NSString *)getFirstLetterByCityName:(NSString *)cityName
71 {
72 NSString *fileContent = [self getFileAllString:FilePath];
73 NSArray *fileContentArray = [fileContent componentsSeparatedByString:@"\n"];
74 //首字母 城市名类
75 FirstLetterAndCity *letterCity;
76 if (fileContentArray) {
77 for (NSString *item in fileContentArray) {
78 if ([item isEqualToString:@""]) {
79 continue;
80 }
81 else if([item containsString:@"<key>"])
82 {
83 letterCity = [[FirstLetterAndCity alloc] init];
84 //<key>x</key> 获取‘x‘前后的位置坐标，由此获取到x
85 NSRange rangeRight = [item rangeOfString:@">"];
86 NSRange rangeLeft = [item rangeOfString:@"</"];
87 [letterCity setFirstLetter:[item substringWithRange:NSMakeRange(rangeRight.location+1, rangeLeft.location-rangeRight.location-1)]];
88
89 }else if([item containsString:@"<string>"])
90 {
91 //获取"<string>XX</string>" XX之间的位置，并且由此获得对应的城市
92 NSRange rangeRight = [item rangeOfString:@">"];
93 NSRange rangeLeft = [item rangeOfString:@"</"];
94 [letterCity addCityList:[item substringWithRange:NSMakeRange(rangeRight.location+1, rangeLeft.location-rangeRight.location-1)]];
95 }
96 //只有当碰到"</array>"时才说明走完了一个key 和 一列 string
97 if (letterCity && [item containsString:@"</array>"]) {
98 [self->_firstLetterAndCityList addObject:letterCity];
99 }
100 }
101 }
102
103 NSString *firstLetter = [self getFLetterByCityName:cityName];
104
105
106 return firstLetter;
107 }
108
109 //当获取 _firstLetterAndCityList 列表时候，通过传入的城市名字获取到对应的城市首字母
110 - (NSString *)getFLetterByCityName:(NSString *)cityName
111 {
112 //FirstLetterAndCity *flCity = [[FirstLetterAndCity alloc] init];
113 for (FirstLetterAndCity *flCity in self->_firstLetterAndCityList) {
114 for (NSString *item in [flCity cityList]) {
115 if ([item isEqualToString:cityName]) {
116 return [flCity firstLetter];
117 }
118 }
119 }
120 return @"NotFound";
121 }
122
123
124 + (void)testManagerCity:(NSString *)cityName
125 {
126 ManagerCity *mCity = [[ManagerCity alloc] init];
127 NSString *firstLetter = [mCity getFirstLetterByCityName:cityName];
128 if (![firstLetter isEqualToString:@"NotFound"]) {
129 NSLog(@"%@",firstLetter);
130 }else{
131 NSLog(@"没有%@城市的首字母",cityName);
132 }
133 }
134 @end
时间： 2024-09-27 08:19:26