OC中的字典

标签：数据   string   类   set   cti   name   

// ********************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);

OC中的字典,布布扣,bubuko.com

OC中的字典

标签：数据   string   类   set   cti   name   

原文地址：http://www.cnblogs.com/MRJ1101/p/3807832.html