OC Foundation框架—字符串操作方法及习题

  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 }
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原文地址：https://www.cnblogs.com/oc-bowen/p/5040205.html