/******* NS Dictionary ********
//创建字典的方式：
// NSDictionary *dic1=[[NSDictionary alloc]init];
// NSDictionary *dic2=[NSDictionary dictionary];//创建可变空字典；
NSDictionary *dictionary1=[NSDictionary dictionaryWithObject:@"Value" forKey:@"key"];
NSLog(@"dictionary1:%@",dictionary1);
NSDictionary *dictionary2=[[NSDictionary alloc]initWithObjects:@[@"V1",@"V2",@"V3"] forKeys:@[@"k1",@"k2",@"k3"]];
NSLog(@"dictionary2:%@",dictionary2);
NSDictionary *dictionary3=[NSDictionary dictionaryWithObjectsAndKeys:@"V1",@"k1",@"V2",@"k2", nil];
NSLog(@"dictionary3%@",dictionary3); //必须是一一对应
//自己封装一个包涵从学生信息的字典
NSString *[email protected]"Tom";
NSArray *[email protected][@90,@100,@80];
NSArray *[email protected][@20,stu_name,stu_score];
NSDictionary *stuDic=[NSDictionary dictionaryWithObjects:valueArray forKeys:@[@"age",@"name",@"score",]];
NSLog(@"%@",stuDic);
//根据已有字典创建新的字典
NSDictionary *dictionary4=[NSDictionary dictionaryWithDictionary:dictionary3];
NSLog(@"dictionary4%@",dictionary4);
//获取字典中所有元素（键值对）的个数
NSLog(@"dictionary4.count=%ld",dictionary4.count);
// 根据key值去获取value值
NSString *value1=[dictionary4 valueForKey:@"k1"];
NSLog(@"%@",value1);
NSArray *value_array=[stuDic valueForKey:@"score"];
NSLog(@"%@",value_array);
//获取字典中所有的key
NSArray *keyArray=[dictionary4 allKeys];
NSArray *value_Array=[stuDic allValues];
NSLog(@"%@%@",keyArray,value_Array);
/********** NSMutableDictionary **********
NSMutableDictionary *mutableDic1=[NSMutableDictionary dictionaryWithObjects:@[@"V1",@"V2",@"V3"] forKeys:@[@"k1",@"k2",@"k3"]];
//添加
[mutableDic1 setObject:@"V4" forKey:@"k3"];//替换原来的值
NSLog(@"%@",mutableDic1);
//根据已经存在的字典添加
[mutableDic1 addEntriesFromDictionary:dictionary4];
NSLog(@"%@",mutableDic1);
//修改
//将当前字典所有元素替换成新的字典中的元素
NSDictionary *dictionary=[NSDictionary dictionaryWithObjects:@[@"A",@"B"] forKeys:@[@"A1",@"B1"]];
[mutableDic1 setDictionary:dictionary];
NSLog(@"%@",mutableDic1);
//指定key值修改
[mutableDic1 setObject:@"newA" forKey:@"A1"];
NSLog(@"%@",mutableDic1);
// 删除
[mutableDic1 removeObjectForKey:@"B1"];//指定key值删除
[mutableDic1 removeObjectsForKeys:@[@"A1",@"B1"]];//指定多个key删除
[mutableDic1 removeAllObjects];//删除所有