NSArray、NSSet、NSDictionary

/*

 集合

 1.NSArray\NSMutableArray

 * 有序

 * 高速创建（不可变）：@[obj1, obj2, obj3]

 * 高速訪问元素：数组名[i]

 2.NSSet\NSMutableSet

 * 无序

 3.NSDictionary\NSMutableDictionary

 * 无序

 * 高速创建（不可变）：@{key1 : value1,  key2 : value2}

 * 高速訪问元素：字典名[key]

 */

字典创建

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {

    @autoreleasepool {

        NSLog(@"**************************  ******************************");

        //方式一:

         NSDictionary *dict = [NSDictionary dictionaryWithObject:@"jack" forKey:@"name"];

        //方式二:

         NSArray *keys = @[@"name", @"address"];

         NSArray *objects = @[@"jack", @"BeiJing"];

         NSDictionary *dict2 = [NSDictionary dictionaryWithObjects:objects forKeys:keys];

         NSLog(@"集合二结果为:%@",dict2);

        //方式三:值健对

         NSDictionary *dict3 = [NSDictionary dictionaryWithObjectsAndKeys:

         @"jack", @"name",

         @"BeiJing", @"address",

         @"88888888", @"qq", nil];

         NSLog(@"集合三结果为:%@",dict3);

字典高速初始化

        NSLog(@"************************ 字典高速初始化 **************************");

        //健值对

        NSDictionary *dict5 = @{@"name" : @"jack", @"address" : @"Beijing"};

        id obj = dict5[@"name"];

        NSLog(@"%@", obj);

        // 返回的是键值对的个数

        NSLog(@"%ld", dict5.count);

字典创建实例

        NSLog(@"************************ 字典创建实例 ****************************");

        //界面语言,程序窗口标题，确定按钮文字，提示输入

        NSArray* values=[NSArray arrayWithObjects:@"欢迎登录",@"登录",@"请输入username:", nil];

        NSArray* keys1=[NSArray arrayWithObjects:@"window_title",

                        @"confirm_button",@"input_hint", nil];

        NSDictionary* dict4=[NSDictionary dictionaryWithObjects:values forKeys:keys1];

        NSLog(@"count:%lu",dict.count);

        //NSEnumerator能够使用for－each循环高速进行迭代

        NSEnumerator*keyEnums=[dict4 keyEnumerator];

        int i=0;

        for (NSString* key in keyEnums) {

            NSLog(@"key%d:%@",i++,key);

        }

        NSLog(@"window_title=%@",[dict4 objectForKey:@"window_title"]);

        NSLog(@"confirm_button=%@",[dict4 objectForKey:@"confirm_button"]);

        NSLog(@"input_hint=%@",[dict4 objectForKey:@"input_hint"]);

可变字典

        NSLog(@"*************************** 可变字典 *****************************");

        NSMutableDictionary *dict6 = [NSMutableDictionary dictionary];

        // 加入值健对

        [dict6 setObject:@"jack" forKey:@"name"];

        [dict6 setObject:@"BeiJing" forKey:@"address"];

        [dict6 setObject:@"1206293008" forKey:@"QQ"];

        [dict6 setObject:@"male" forKey:@"sex"];

        [dict6 setObject:@"programming" forKey:@"hobby"];

         NSLog(@"%@", dict6);

        // 移除值健对

         [dict6 removeObjectForKey:@"address"];

        //输出姓名

         NSString *str = dict6[@"name"];

         NSLog(@"%@", str);

字典遍历

          NSLog(@"************************** 字典遍历 ******************************");

        // 方式一:字典是无序的

         NSDictionary *dict7 = @{

                               @"address" : @"北京",

                               @"name" : @"jack",

                               @"qq" : @"88888888"};

            NSArray *keys2 = [dict7 allKeys];

            for (int i = 0; i<dict7.count; i++)

            {

                NSString *key = keys2[i];

                NSString *object = dict7[key];

                NSLog(@"%@ ~~~~~~~ %@", key, object);

            }

        //方式二:block遍历

        [dict7 enumerateKeysAndObjectsUsingBlock:

         ^(id key, id obj, BOOL *stop) {

             NSLog(@"%@ ---- %@", key, obj);

         }];

字典需求排序

        NSLog(@"************************* 字典需求排序 ****************************");

        NSMutableDictionary* givenName=[NSMutableDictionary dictionaryWithObjectsAndKeys:

                                        [NSNumber numberWithInt:4],@"王", nil];

        [givenName setObject:[NSNumber numberWithInt:8] forKey:@"周"];

        [givenName setObject:[NSNumber numberWithInt:6] forKey:@"李"];

        [givenName setObject:[NSNumber numberWithInt:9] forKey:@"赵"];

        //keySortedByValueUsingSelector

        //由于value是NSNumber类型。全部能够使用compare：进行比較

        NSArray* keysOfName=[givenName keysSortedByValueUsingSelector:@selector(compare:)];

        for (NSString* key in keysOfName) {

            NSLog(@"key:%@",key);

        }

        //高速迭代（枚举）

        for (NSString * key in givenName) {

            NSNumber* value=[givenName valueForKey:key];

            NSLog(@"[%@]=%@",key,value);

        }

    }

    return 0;