Foundation frame 中常用类的代码

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
    @autoreleasepool
    {
#pragma mark - Test
//        int a = 10;
//        double b = 7.7;
//        float c = 5.7;
//        
//        NSNumber *numberInt = [NSNumber numberWithInt:a];
//        int a1 = [numberInt intValue];
//        
//        NSNumber *numberDou = [NSNumber numberWithDouble:b];
//        double b1 = [numberDou doubleValue];
//        
//        NSNumber *numberFlo = [NSNumber numberWithFloat:c];
//        float c1 = [numberFlo floatValue];
//        
//        NSLog(@"numberInt = %d, numberDou = %lf, numberFlo = %f", a1, b1, c1);
//        
//        NSString *str1 = @"Welcome";
//        NSString *str2 = @"To";
//        NSString *str3 = @"HuaShan";
//        
//        NSString *str4 = [[[[str1 stringByAppendingString:@" "] stringByAppendingString:str2] stringByAppendingString:@" "] stringByAppendingString:str3];
//        //连接成功
//        NSLog(@"%@", str4);
//        
//        NSString *str5 = [NSString stringWithFormat:@"%@ %@ %@", str1, str2, str3];
//        //连接成功
//        NSLog(@"%@", str5);
//        
//        NSString *str6 = [str1 stringByAppendingFormat:@" %@ %@", str2, str3];
//        NSLog(@"%@", str6);
//        
//        //第一种
//        NSString *str7 = [str4 substringToIndex:7];
//        //第二种
//        NSRange range = NSMakeRange(0, 7);
//        NSString *str8 = [str4 substringWithRange:range];
//        //第三种
//        NSArray *arr = [str4 componentsSeparatedByString:@" "];
//        NSLog(@"%@ %@ %@", str7, str8, arr[0]);
        
#pragma mark - NSNumber
//        double a = 8.8;
//        //实例方法：用NSNumber存储基本数据类型
//        NSNumber *num1 = [[NSNumber alloc] initWithDouble:a];
//        //类方法
//        NSNumber *num2 = [NSNumber numberWithDouble:a];
//        NSLog(@"num1 = %@, num2 = %@", num1, num2);
//        double a1 = [num1 doubleValue];
//        double a2 = [num2 doubleValue];
//        NSLog(@"a1 = %.2f, a2 = %.2f", a1, a2);
//        
//        NSString *str1 = @"Hello World";
//        NSString *str2 = @"HuaShan";
//        //连接两个字符串
//        NSString *str3 = [[str1 stringByAppendingString:@" "] stringByAppendingString:str2];
//        NSString *str4 = [NSString stringWithFormat:@"%@ %@", str1, str2];
//        NSString *str5 = [str1 stringByAppendingFormat:@" %@", str2];
//        NSLog(@"str3 = %@, str4 = %@, str5 = %@", str3, str4, str5);
//        //去下标6之后的字符串
//        NSString *subStr = [str1 substringFromIndex:6];
//        NSLog(@"subStr = %@", subStr);
//        //取下标5之前的字符串
//        NSString *subStr1 = [str1 substringToIndex:5];
//        NSLog(@"subStr1 = %@", subStr1);
//        //取一定范围的字符串
//        NSRange range = NSMakeRange(6, 2);
//        NSString *subStr2 = [str1 substringWithRange:range];
//        NSLog(@"subStr2 = %@", subStr2);
//        //比较两个字符串，相等返回YES，否则返回NO。
//        BOOL bb = [subStr isEqualToString:subStr1];
//        if  (bb)
//            NSLog(@"相等");
//        else
//            NSLog(@"不相等");
//        //查找字符串的range
//        NSRange range1 = [str1 rangeOfString:@"World"];
//        int loc = (int)range1.location;
//        int len = (int)range1.length;
//        NSLog(@"loc = %d, len = %d", loc, len);
//        
//        //把字符串转成整型
//        NSString *str6 = @"123";
//        int b = [str6 intValue];
//        NSLog(@"b = %d", b);
//        //组件分割字符串
//        NSString *str7 = @"hello,huashan,welcome,to,huashankeji";
//        NSArray *arr = [str7 componentsSeparatedByString:@","];
//        NSLog(@"arr[4] = %@", arr[4]);
//        
//        NSString *str8 = [str1 stringByAppendingFormat:@" %@", arr[4]];
//        NSLog(@"str8 = %@", str8);
//        //字符串替换出现的字符串
//        NSString *str9 = [str8 stringByReplacingOccurrencesOfString:@"huashankeji" withString:@"HuaShanKeJi"];
//        NSLog(@"str9 = %@", str9);
#pragma mark - NSArray
//        //数组的创建
//        NSArray *arr = [NSArray arrayWithObjects:@"hello", @"world", nil];
//        //输出为:hello, 2, 1, hello, world
//        NSLog(@"%@, %ld, %ld, %@, %@", [arr objectAtIndex:0], [arr count], [arr indexOfObject:@"world"], [arr firstObject], [arr lastObject]);
//        NSArray *arr1 = @[@"hello", @"world"];
//        NSLog(@"arr1[0] = %@", arr1[0]);//hello
//        NSLog(@"%@", arr1);//打印出每一个元素
#pragma mark - NSMutableArray
//        //创建出一个动态数组arr2
//        NSMutableArray *arr2 = [[NSMutableArray alloc] initWithCapacity:1];
//        //添加对象（元素）
//        [arr2 addObject:@"hello"];
//        [arr2 addObject:@"world"];
//        [arr2 insertObject:@"HELLO" atIndex:1];
//        
//        NSLog(@"%ld", [arr2 indexOfObject:@"world"]);//找到对象的下标2，并打印
//        NSLog(@"%ld", [arr2 indexOfObject:@"asdf"]);//对象下标为找到，NSNotFound返回一个9223372036854775807
////        [arr2 removeObject:@"HELLO"];//删除指定对象
////        [arr2 removeObjectAtIndex:1];//删除下标为1的数组元素（对象）
////        [arr2 removeLastObject];//删除最后一个对象
//        [arr2 replaceObjectAtIndex:1 withObject:@"song"];//替换下标为1的对象
//        NSLog(@"arr2 = %@", arr2);
//        
//        //数组的三种遍历
//        //第一种
//        long j = [arr2 count];
//        for (int i = 0; i < j; ++i)
//        {
//            NSLog(@"%@", arr2[i]);
//        }
//       [arr2 addObjectsFromArray:arr];//把数组arr添加到arr2数组后面
//        NSLog(@"%@", arr2);
//        //第二种
//        [arr2 addObject:[NSNumber numberWithInteger:18]];//添加一个长整型常量到对象arr2中
//        for (NSString *str in arr2)
//        {
//            NSLog(@"str = %@", str);
//        }
//        //第三种
//        //用NSArray的类方法创建一个新数组
//        NSArray *arr3 = [NSArray arrayWithObjects:@"1", @"4", @"3", @"2",nil];
//        for (id original in arr3)
//        {
//            NSLog(@"object = %@", original);
//        }
//        
//        //比较单个常量字符，并排序。注：字符串比较只比首位，数字字符串线转化为NSNumber
//        NSArray *arr4 = [arr3 sortedArrayUsingSelector:@selector(compare:)];
//        for (id result in arr4)
//        {
//            NSLog(@"result = %@", result);
//        }
//        
//        NSArray *arr5 = [arr3 sortedArrayUsingSelector:NSSelectorFromString(@"compare:")];
//        for (id result1 in arr5)
//        {
//            NSLog(@"result1 = %@", result1);
//        }
        
#pragma mark - NSDictionary
        //字典的两种初始化方式
        NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:@"132", @"1", @"527", @"2", nil];
        NSString *str = [dic objectForKey:@"2"];//第一种
        NSLog(@"%@", str);//527
        //第二种
        NSDictionary *dic1 = @{@"1":@"132", @"2":@"527"};
        NSString *str1 = dic1[@"1"];
        NSLog(@"%@", str1);//132
        //取出字典里所有的键值allValues取出所有的值
        NSArray *arr = [dic allValues];
        NSLog(@"arr = %@", arr);
        //从所有的键值中一一找到对象
        NSDictionary *arr1 = [NSDictionary dictionaryWithObjects:arr forKeys:[dic allKeys]];
        NSLog(@"arr1 = %@", arr1);
#pragma mark - NSMutableDictionary
        //创造和返回一个空字典
        NSMutableDictionary *mDic = [NSMutableDictionary dictionary];
        [mDic setObject:@"song" forKey:@"1"];
        [mDic setObject:@"lei" forKey:@"2"];
        [mDic setObject:@"hua" forKey:@"3"];
        [mDic setObject:@"shan" forKey:@"4"];
        [mDic removeObjectForKey:@"2"];
        [mDic removeObjectsForKeys:[NSArray arrayWithObjects:@"1",@"2", nil]];
        NSLog(@"mDic = %@", mDic);
        //字典的快速遍历
        NSArray *arr2 = [mDic allValues];
        for (id object in arr2)
        {
            NSLog(@"object = %@", object);
        }
        
    }
    return 0;
}