OC中的字典

// ********************不可变最字典*****************

/* NSDictionary * dic = [NSDictionary dictionaryWithObject:@"张三" forKey:@"name" ];

NSLog(@"%@", dic);//便利构造器创建字典

//字典里一个key只有一个vlaue, 但是一个value可以有好几个key

NSDictionary  * dic1 = [[NSDictionary alloc] initWithObjectsAndKeys:@"zhangsan", @"name", @"boy", @"sex", @"toyke", @"address", nil];//初始化创建字典

NSLog(@"%@", dic1);

NSArray * value = [[NSArray alloc] initWithObjects:@"张三", @"李四", @"王五", @"赵六", nil];

NSArray * key = [[NSArray alloc] initWithObjects:@"name3", @"name4", @"name5", @"name6", nil];

NSDictionary * nk = [[NSDictionary alloc] initWithObjects:value forKeys:key];//初始化+数组创建字典

NSLog(@"%@", nk);

NSLog(@"%lu", [nk count]);//获取键值对的个数

NSString * result = [nk objectForKey:@"name3"];//根据键来获得相对应的值

NSLog(@"%@", result);

NSString * re = [nk objectForKey:@"name6"];

NSString * re1 = [nk objectForKey:@"name4"];

NSString * re3 = [nk objectForKey:@"name5"];

NSLog(@"%@, %@, %@", re, re1, re3);

NSArray * cou = [nk allKeys];//获得所有的键

for (int i = 0; i < [cou count]; i++) {

NSString * key = [cou objectAtIndex:i];//获得数组中的键

NSString * value = [nk objectForKey:key];//用键来获得值

NSLog(@"%@", value);

}

NSArray * cou1 = [nk allKeys];

for (int i = 0; i < [cou1 count]; i++) {

NSLog(@"%@", [nk objectForKey:[cou objectAtIndex:i]]);

}

NSArray * values = [nk allValues];//获得所有的值存放在数组中

for (int i = 0; i < [values count]; i++) {

id c = [values objectAtIndex:i];

NSLog(@"%@", c);

}*/

// ********************可变最字典*****************

NSMutableDictionary * dict = [[NSMutableDictionary alloc] initWithCapacity:1];

[dict setObject:@"zhangsan" forKey:@"name"];

[dict setObject:@"boy" forKey:@"sex"];

[dict setObject:@"18" forKey:@"age"];

NSLog(@"%@", dict);

[dict setObject:@"paoniu" forKey:@"hobby"];

NSLog(@"%@", dict);

NSDictionary  * dic1 = [[NSDictionary alloc] initWithObjectsAndKeys:@"zhangsan1", @"name1", @"boy1", @"sex1", @"toyke1", @"address", nil];//初始化创建字典

[dict setValuesForKeysWithDictionary:dic1];

[dict removeObjectForKey:@"name1"];//移除键值为name1的值

NSNumber * num = [NSNumber numberWithInt:24];//用number把数字转成对象

[dict setObject:num forKey:@"age"];

NSNumber * score = [NSNumber numberWithFloat:88.8];

[dict setObject:score forKey:@"score"];

[dict setObject:[NSNumber numberWithDouble:999.999] forKey:@"fight"];

NSLog(@"%@", dict);

float sco = [[dict objectForKey:@"score"] floatValue];//把对象转成基本数据类型

NSLog(@"%g", sco);