NSString setString的用法：彻底更换

setString:      彻底更换  字符串 a 的内容 

 

- (void)viewDidLoad

{

    NSMutableString *a = [[NSMutableString  alloc] initWithString:@"123456798"];

    NSLog(@" \n a:  %@ \n",a);

    [a setString:@"I wanna go home"];

    NSLog(@" \n a:  %@ \n",a);

    [a release];

}

2011-07-05 21:10:59.843 Q[9122:207]   a:  123456798 

2011-07-05 21:10:59.844 Q[9122:207]   a:  I wanna go home