1 #import <Foundation/Foundation.h>
2
3 int main(int argc, const char * argv[]) {
4 @autoreleasepool {
8 /*
9 不可变字符串
10 1.创建字符串
11 实例方法（3种）
12 类方法（3种）
13 2.不可变字符串：
14 统计长度（2种）
15 索引提取 (3种)
16 比较 (3种)
17 查照字符串位置（1种）
18 判断前后缀
19 转换数字
20 大小写转换
21 字符串提取
22
23 可变字符串
24 1.创建可变字符串
25 2.可变字符串的操作
26 增（3种）删（1种）改（1种）查
27
28
29 */
30
31 //实例方法（3种）
32 NSString *str1 = @"123456789";
33 NSString *str2 = [[NSString alloc] initWithFormat:@"%d4567",3];
34 // NSString *str3 = [[NSString alloc] initWithString:str2];//传的是对象
35
36 //类方法（3种）
37 NSString *str4 = [NSString stringWithFormat:@"Abc%@eFg",@"d"];
38 // NSString *str5 = [NSString stringWithString:str4];
39
40
41
42 //统计长度（2种）
43 NSUInteger length = [str1 length];
44 NSUInteger length1 = str1.length;
45 NSLog(@"%lu %lu",length,length1);
46
47
48 //索引提取 (3种)
49 NSString *newStr1 = [str1 substringFromIndex:3];
50 NSLog(@"%@",newStr1);
51 NSString *newStr2 = [str1 substringToIndex:3];
52 NSLog(@"%@",newStr2);
53 NSString *newStr3 = [str1 substringWithRange:NSMakeRange(3, 4)];
54 NSLog(@"%@",newStr3);
55
56
57 //比较 (3种)
58 if ([str1 isEqualToString:str2]) {
59 NSLog(@"相同");
60 }else
61 NSLog(@"不相同");
62
63
64
65 if ([str1 compare:str2] == NSOrderedAscending) {
66 NSLog(@"str1>str2");
67 }
68 else if ([str1 compare:str2] == NSOrderedDescending)
69 NSLog(@"str1<str2");
70 else if ([str1 compare:str2] == NSOrderedSame)
71 NSLog(@"==");
72
73
74
75 if ([str1 caseInsensitiveCompare:str2] == NSOrderedAscending) {
76 NSLog(@"str1>str2");
77 }
78 else if ([str1 caseInsensitiveCompare:str2] == NSOrderedDescending)
79 NSLog(@"str1<str2");
80 else if ([str1 caseInsensitiveCompare:str2] ==NSOrderedSame)
81 NSLog(@"==");
82
83
84 // 查找字符串位置
85 NSRange range = [str1 rangeOfString:str2];
86 if (range.location != NSNotFound) {
87 NSLog(@"location:%lu length:%lu",range.location,range.length);
88
89 } else {
90 NSLog(@"没找到");
91 }
92
93
94 //判断前后缀（2种）
95 BOOL flag = [str4 hasPrefix:@"abc"];
96 NSLog(@"%d",flag);
97
98 BOOL anotherFlag = [str4 hasSuffix:@"fg"];
99 NSLog(@"%d",anotherFlag);
100
101
102 //转换数字（4种）
103 int number = [str1 intValue];
104 NSLog(@"%d",number);
105
106 NSInteger number1 = [str1 intValue];
107 NSLog(@"%ld",number1);
108
109 NSString *str6 = @"1234567.89";
110 double number2 = [str6 doubleValue];
111 NSLog(@"%lf",number2);
112
113 //大小写转换
114 NSString *upStr = [str4 uppercaseString];
115 NSLog(@"%@",upStr);
116 NSString *lowStr = [str4 lowercaseString];
117 NSLog(@"%@",lowStr);
118 NSString *tempStr = [str4 capitalizedString];
119 NSLog(@"%@",tempStr);
120
121
122
123
124 // 可变字符串
125 // 实例方法
126 NSMutableString *muStr1 = [[NSMutableString alloc]
127 initWithFormat:@"1%d3",2];
128
129 NSMutableString *muStr2 = [[NSMutableString alloc]
130 initWithString:@"123"];
131
132 NSMutableString *muStr3 = [[NSMutableString alloc]
133 initWithCapacity:10];
134
135 // 类方法
136 NSMutableString *muStr4 = [NSMutableString stringWithFormat:@"4%d6",5];
137
138 NSMutableString *muStr5 = [NSMutableString stringWithString:@"123"];
139
140 NSMutableString *muStr6 = [NSMutableString stringWithCapacity:10];
141
142
143 //增（3种）
144
145 [muStr1 appendFormat:@"%d",456];
146 NSLog(@"%@",muStr1);
147
148 [muStr2 appendString:@"789"];
149 NSLog(@"%@",muStr2);
150
151 [muStr3 insertString:@"abcdefghijklmn" atIndex:0];
152 NSLog(@"%@",muStr3);
153
154 [muStr4 insertString:@"abcdefghijklmn" atIndex:2];
155 NSLog(@"%@",muStr4);
156
157
158
159 //删除
160 [muStr5 deleteCharactersInRange:NSMakeRange(2, 1)];
161 NSLog(@"%@",muStr5);
162
163 //改
164 [muStr6 replaceCharactersInRange:NSMakeRange(0, 0) withString:@"1234567890"];
165 NSLog(@"%@",muStr6);
166
167 [muStr5 replaceCharactersInRange:NSMakeRange(0, 1) withString:@"abcd"];
168 NSLog(@"%@",muStr5);
1 #import <Foundation/Foundation.h>
2
3 @interface MyStringTools : NSObject
4
5 /*
6
7 1.创建一个类，要求：
8 (1)、定义一个方法，能完成字符串逆序输出的操作
9 (2)、定义一个方法，能删除某字符串中的指定字串
10
11 myStringTool delete:(NSString*) InString:(NSString*)
12
13 (3)、定义一个方法，能查找某字符串在某字符串中出现的次数
14 (4)、定义一个方法，能传入两个字符串,将这个字符串组合成一个新的对称字符串返回
15 (5)、定义一个方法，能将原字符串进行小写转大写，大写转小写
16 (6)、定义一个方法，能压缩传入的字符串
17 （比如输入@"aaabbbcceaa" 输出@"3a3b2c1e2a"）
18 (7)、定义一个方法，能对传入的字符串按照字母顺序进行排列
19 （比如输入@"aczabczab" 输出@"aaabbcczz”）
20 (8)、定义一个方法，能够替换某字符串中的某个指定字串
21 (9)、定义一个方法，能够获取指定字符串长度。
22 */
23
24 //定义一个方法，能完成字符串逆序输出的操作
25 +(NSString *) reverseOrder:(NSString *) str1;
26
27 //定义一个方法，能删除某字符串中的指定字串
28 +(NSString *) deleteTheString:(NSString *) str1
29 inString:(NSString *) str2;
30
31 //定义一个方法，能查找某字符串在某字符串中出现的次数
32 +(NSInteger) findNumberOfString:(NSString *) str1
33 inString:(NSString *) str2;
34
35 //定义一个方法，能传入两个字符串,将这个字符串组合成一个新的对称字符串返回
36 +(NSString *) makeUpString:(NSString *) str1
37 andString:(NSString *) str2;
38
39 //定义一个方法，能将原字符串进行小写转大写，大写转小写
40 +(NSString *) convertLetters:(NSString *) str1 andCase:(NSString *) mycase;
41
42 //定义一个方法，能压缩传入的字符串
43 +(NSString *) compressString:(NSString *) str1;
44
45 //定义一个方法，能对传入的字符串按照字母顺序进行排列
46 +(NSString *) theStringOrder:(NSString *) str1;
47
48 //定义一个方法，能够替换某字符串中的某个指定字串
49 +(NSString *) replaceTheString:(NSString *) str1
50 fromString:(NSString *) str2
51 toString:(NSString *) str3;
52
53 //定义一个方法，能够获取指定字符串长度
54 +(NSInteger) obtainTheLength:(NSString *) str1;
55 @end
56
57
58
59
60
61
62
63 #import "MyStringTools.h"
64
65 @implementation MyStringTools
66
67 +(NSString *) reverseOrder:(NSString *) str1
68 {
69 NSMutableString *string = [NSMutableString stringWithString:str1];
70 NSMutableString *mutableString =[NSMutableString stringWithString:str1];
71
72
73 for (int i=0; i<string.length; i++) {
74 //方法1
75 NSString *subStr1 = [string substringWithRange:NSMakeRange(i, 1)];
76 NSString *subStr2 = [string substringWithRange:
77 NSMakeRange(string.length - i-1, 1)];
78 // 取长度和范围
79 NSRange range1 = [string rangeOfString:subStr1];
80 NSRange range2 = [string rangeOfString:subStr2];
81
82 [mutableString replaceCharactersInRange:range1 withString:subStr2];
83 [mutableString replaceCharactersInRange:range2
84 withString:subStr1];
85 }
86 return mutableString;
87
88 //方法2
89 // NSString *tempStr = [string substringFromIndex:string.length-1];
90 //
91 // [string insertString:tempStr atIndex:i];
92 //
93 // [string deleteCharactersInRange:NSMakeRange(string.length-1,1)];
94 // }
95 // return string
96
97 }
98
99 +(NSString *) deleteTheString:(NSString *) str1
100 inString:(NSString *) str2
101 {
102 NSMutableString *string = [NSMutableString stringWithString:str2];
103
104 NSRange range = [string rangeOfString:str1];
105
106 if (range.location !=NSNotFound) {
107 [string deleteCharactersInRange:range];
108 }
109 else
110 NSLog(@"没有发现字符");
111 return string;
112 }
113
114 +(NSInteger) findNumberOfString:(NSString *) str1
115 inString:(NSString *) str2
116 {
117 int i,count=0;
118
119 NSMutableString *string = [NSMutableString stringWithString:str2];
120
121 for (i=0; i<string.length; i++) {
122
123 NSRange range = [string rangeOfString:str1];
124
125 if (range.location !=NSNotFound) {
126 [string deleteCharactersInRange:range];
127 count++;
128 }
129 }
130 return count;
131 }
132
133
134 +(NSString *) makeUpString:(NSString *) str1
135 andString:(NSString *) str2
136 {
137 NSMutableString *string = [NSMutableString stringWithString:str2];
138 [string appendString:str1];
139
140 for (NSInteger i=string.length-1; i>=0; i--) {
141 [string appendString:[string substringWithRange:NSMakeRange(i, 1)]];
142
143 }
144 return string;
145 }
146
147 +(NSString *) convertLetters:(NSString *) str1 andCase:(NSString *) mycase
148 {
149 NSMutableString *string = [NSMutableString stringWithString:str1];
150
151 if ([mycase isEqualToString:@"大写"]) {
152 return [string uppercaseString];
153 }
154 else
155 return [string lowercaseString];
156 }
157
158 +(NSString *) compressString:(NSString *) str1
159 {
160 int i;
161 NSMutableString *string = [NSMutableString stringWithString:str1];
162 NSMutableString *newString;
163 NSMutableString *newString1 = [NSMutableString stringWithString:@""];
164
165 for (i=0; i<string.length; i++) {
166
167 NSString *tempStr = [string substringWithRange:NSMakeRange(0, 1)];
168 int count=0;
169
170 for (int j=0; j<string.length; j++) {
171
172 NSString *tempStr1 = [string substringWithRange:NSMakeRange(0, 1)];
173
174 if ([tempStr1 isEqualToString:tempStr]) {
175
176 [string deleteCharactersInRange:NSMakeRange(0, 1)];
177 count++;
178 }
179 }
180 newString = [NSMutableString stringWithFormat:@"%d%@",count,tempStr];
181 [newString1 appendString:newString];
182
183 }
184 return newString1;
185
186 }
187
188 +(NSString *) theStringOrder:(NSString *) str1
189 {
190 NSMutableString *string = [NSMutableString stringWithString:str1];
191
192 for (int i=0; i<string.length-1; i++) {
193 for (int j=0; j<string.length-1; j++) {
194
195 NSString *tempStr1=[string substringWithRange:NSMakeRange(j, 1)];
196 NSString *tempStr2=[string substringWithRange:NSMakeRange(j+1, 1)];
197
198 NSRange range1 = [string rangeOfString:tempStr1];
199 NSRange range2 = [string rangeOfString:tempStr2];
200
201 if ([tempStr1 compare:tempStr2]==NSOrderedAscending) {
202
203
204 [string replaceCharactersInRange:range2 withString:tempStr1];
205 [string replaceCharactersInRange:range1 withString:tempStr2];
206 }
207 }
208 }
209 return string;
210 }
211
212
213 +(NSString *) replaceTheString:(NSString *) str1
214 fromString:(NSString *) str2
215 toString:(NSString *) str3
216 {
217 NSMutableString *string = [NSMutableString stringWithString:str2];
218
219 NSRange range = [string rangeOfString:str1];
220 [string replaceCharactersInRange:range withString:str3];
221 return string;
222 }
223
224 +(NSInteger) obtainTheLength:(NSString *) str1
225 {
226 return str1.length;
227 }
228
229
230
231
232 @end
233
234
235
236
237
238
239
240 #import <Foundation/Foundation.h>
241 #import "MyStringTools.h"
242
243 int main(int argc, const char * argv[]) {
244 @autoreleasepool {
245
246 NSString *mystring=[NSString stringWithFormat:@"abcdef"];
247
248 NSLog(@"%@",[MyStringTools reverseOrder:mystring]);
249
250 NSLog(@"%@",[MyStringTools deleteTheString:@"bc"
251 inString:mystring]);
252
253 NSLog(@"%ld",[MyStringTools findNumberOfString:@"bc"
254 inString:@"abcdfebcbbc"]);
255
256 NSLog(@"%@",[MyStringTools makeUpString:@"abcdef"
257 andString:@"gh"]);
258
259 NSLog(@"%@",[MyStringTools convertLetters:@"aBcDeF"
260 andCase:@"大写"]);
261
262 NSLog(@"%@",[MyStringTools compressString:@"hhfffkkkkkiinil"]);
263
264 NSLog(@"%@",[MyStringTools theStringOrder:@"sadcbfw"]);
265
266 NSLog(@"%@",[MyStringTools replaceTheString:@"sdf"
267 fromString:@"asdfghjkl"
268 toString:@"abc"]);
269
270 NSLog(@"%lu",[MyStringTools obtainTheLength:@"qwert"]);
271
272
273
274 }
275 return 0;
276 }
时间： 2024-08-04 19:24:28