Object-C学习 NSString使用,可变字符串
NSMutableString * str =[[NSMutableString alloc] init]; [str appendString:@"111"];//追加字符串 [str appendFormat:@"%c",'ABC'];//追加字符串 [str insertString:@"mx" atIndex:4]; //插入字符串,从第几个开始插入 [str insertString:[NSString stringWithFormat:@"%d",25] atIndex:4];/插入字符串,从第几个开始插入 [str deleteCharactersInRange:NSMakeRange(3,5)];// 从第三个字符串开始删除5个字符 [str replaceCharactersInRange:NSMakeRange(3,2)withString:@"mingxun"]; //修改