NSMutableString基础-初始化、赋值、替换、插入、删除、查找

 1 #import <Foundation/Foundation.h>
 2 
 3 int main(int argc, const char * argv[]) {
 4     @autoreleasepool {
 5         NSMutableString *mustr1=[[NSMutableString alloc]init];
 6         NSMutableString *mustr2=[[NSMutableString alloc]initWithFormat:@"Hello"];
 7         NSMutableString *mustr3=[[NSMutableString alloc]init];
 8         //赋值
 9         NSString *str1=@"Welcom to OC";
10         mustr1=[[NSMutableString alloc]initWithString:str1];
11         //NSMutableString *mustr3=@"Hello";     错误的赋值法，不能将字符串常量直接赋值给NSMutableString
12         //替换字符串
13         NSRange rang1=[mustr1 rangeOfString:@"OC"];
14         [mustr1 replaceCharactersInRange:rang1 withString:@"Objective-C"];
15         NSLog(@"mustr1=%@",mustr1);
16         //插入字符串
17         [mustr1 insertString:@" students" atIndex:6];   //在指定位置插入字符串
18         [mustr2 appendString:@" teacher!"];             //在末尾插入字符串
19         [mustr3 appendFormat:@"Hey!%@",str1];           //格式化插入字符串
20         NSLog(@"mustr1=%@,mustr2=%@,mustr3=%@",mustr1,mustr2,mustr3);
21         //指定位置删除字符串
22         [mustr1 deleteCharactersInRange:NSMakeRange(7, 9)];
23         NSLog(@"mustr1=%@",mustr1);
24         //查找删除字符串
25         NSRange rang2=[mustr2 rangeOfString:@" teacher"];
26         if(rang2.location!=NSNotFound){
27             [mustr2 deleteCharactersInRange:rang2];
28         }
29         NSLog(@"%@",mustr2);
30         //重新赋值
31         [mustr1 setString:str1];
32         NSLog(@"%@",mustr1);
33     }
34     return 0;
35 }