字符串的获取

字符串的获取

 // 获得字符串的长度        NSString *str = @"bkkkkk";        NSLog(@"%lu",str.length);

// 根据索引获得字符串的单个字符        NSString *str1 = @"www.itcast.com";        unichar c = [str1 characterAtIndex:4];        NSLog(@"%c",c);

// 根据索引获得字符串的字串        NSString *str2 = @"www.itcast.com";        NSString *tmpStr = [str2 substringFromIndex:3];        NSLog(@"1%@",tmpStr);        NSString *tmpStr1 = [str2 substringToIndex:3];        NSLog(@"2%@",tmpStr1);

// 截取字符串的某一段        NSRange rang = {4,6};        NSString *str3 = [str2 substringWithRange:rang];        NSLog(@"%@",str3);

// 获得一个字符串的索引位置        NSString *str4 = @"it";        NSRange rang1 = [str2 rangeOfString:str4];        if (rang1.location == NSNotFound) {            NSLog(@"没有找到");        }        else        {            NSLog(@"%@",NSStringFromRange(rang1));        }

// 另一种获得字符串索引位置的方法        NSRange rang2 = [str2 rangeOfString:@"cast" options:NSCaseInsensitiveSearch];        NSLog(@"%@",NSStringFromRange(rang2));    }