[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

 

#pragma mark buffer string create
void stringCreate()
{
    NSMutableString *mutStr = [[NSMutableString alloc] initWithCapacity:10];
    [mutStr setString:@"Go!"];
    NSLog(@"%@", mutStr);
    [mutStr appendString:@"Hello"];
    [mutStr appendFormat:@",age is %i and height is %.2f", 12, 1.54];
    NSLog(@"%@", mutStr);
   
    //Replace string
    NSRange r = [mutStr rangeOfString:@"age"];
    [mutStr replaceCharactersInRange:r withString:@"number"];
    NSLog(@"%@", mutStr);
   
    //Insert string
    [mutStr insertString:@"insert" atIndex:2];
    NSLog(@"%@", mutStr);
   
    //Delete string
    NSRange r2 = [mutStr rangeOfString:@"height"];
    [mutStr deleteCharactersInRange: r2];
    NSLog(@"%@", mutStr);
}