[OC Foundation框架

NSString是不可变的

NSMutableString是可变字符串

1.初始化

2.串联字符串

3.替换字符串

4.插入字符串

5.删除字符串

 1 #pragma mark buffer string create
 2 void stringCreate()
 3 {
 4     NSMutableString *mutStr = [[NSMutableString alloc] initWithCapacity:10];
 5     [mutStr setString:@"Go!"];
 6     NSLog(@"%@", mutStr);
 7     [mutStr appendString:@"Hello"];
 8     [mutStr appendFormat:@",age is %i and height is %.2f", 12, 1.54];
 9     NSLog(@"%@", mutStr);
10    
11     //Replace string
12     NSRange r = [mutStr rangeOfString:@"age"];
13     [mutStr replaceCharactersInRange:r withString:@"number"];
14     NSLog(@"%@", mutStr);
15    
16     //Insert string
17     [mutStr insertString:@"insert" atIndex:2];
18     NSLog(@"%@", mutStr);
19    
20     //Delete string
21     NSRange r2 = [mutStr rangeOfString:@"height"];
22     [mutStr deleteCharactersInRange: r2];
23     NSLog(@"%@", mutStr);
24 }