OC 字典

//
//  main.m
//  nsDictionary
//
//  Created by syrcfwzx on 16/1/8.
//  Copyright (c) 2016年 syrcfwzx. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        
        //注意key 通常是字符串对象
        NSMutableDictionary* dic = [[NSMutableDictionary alloc]initWithObjectsAndKeys:@"jay",@"name",@"22",@"age",@"f",@"gender", nil];
         NSLog(@"%@",dic);
        NSDictionary* dic1 = [NSDictionary dictionaryWithObject:@"166" forKey:@"height"];
        [dic addEntriesFromDictionary:dic1];
        NSLog(@"%@",dic);
        [dic setObject:@"66" forKey:@"weight"];
         NSLog(@"%@",dic);
        //遍历
        //1.先找到所有的key 2计算key的个数
        NSArray* array = [dic allKeys];
        NSInteger count = [dic count];
        for(int i = 0;i<count;i++)
        {
            id key = [array objectAtIndex:i];
            NSLog(@"%@",[dic objectForKey:key]);
        }
        //for in语法
        for(id key in array)
        {
            id obj=[dic objectForKey:key];
            NSLog(@"%@",obj);
        }
        //block遍历
        [dic enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
        
            NSLog(@"key=%@ obj=%@",key,obj);
        }];
        //3通过枚举对象进行枚举
        //将字典里的key转成枚举对象 用于遍历
        NSEnumerator* enumerator = [dic keyEnumerator];
        id key;
        while (key=[enumerator nextObject]) {
            id obj3 = [dic objectForKey:key];
            NSLog(@"%@",obj3);
        }
        
        
    }
    return 0;
}

//课上实例

//
//  main.m
//  dictionary-01
//
//  Created by syrcfwzx on 16/1/7.
//  Copyright (c) 2016年 syrcfwzx. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        
        //key一般为nsstring
        NSDictionary* dic = [NSDictionary dictionaryWithObject:@1 forKey:@"1"];
        NSDictionary* dic2 = @{@"1":@1,@"2":@2};
        
        NSDictionary* dic3 = [NSDictionary dictionaryWithObjectsAndKeys:@1,@"1",@2,@"2",@3,@"3", nil];
        
        NSArray* array = @[@1,@2,@3];
        NSArray* array2 = @[@"1",@"2",@"3"];
        NSDictionary* dic4 = [NSDictionary dictionaryWithObjects:array forKeys:array2];
        
        //字典对象的使用
        //通过key遍历
        for(id key in dic3)
        {
            id obj = [dic3 objectForKey:key];
            NSLog(@"%@",obj);

        }
        
        NSDictionary* concent = @{@"name":@"Tom",
                                  @"age":@25,
                                  @"tel":@"13888888888",
                                  @"email":@"tom@qq.com"
                                  };
        
        NSDictionary* concent2 = @{@"name":@"Jerry",
                                  @"age":@23,
                                  @"tel":@"13884888888",
                                  @"email":@"jerry@qq.com"
                                   };
        
        NSMutableArray* contactBook = [[NSMutableArray alloc]init];
        [contactBook addObject:concent];
        [contactBook addObject:concent2];
        NSLog(@"%@",contactBook);
        //在字典对象中 key值必须是唯一的 不能重复
        NSDictionary* concent3 = @{@"name":@"kobe",
                                   @"name":@"by",
                                   @"age":@27,
                                   @"tel":@"13884886888",
                                   @"email":@"kobe@qq.com"
                                   };
        NSLog(@"%@",concent3);
        
        //字典对象的BLOCK遍历
        [concent3 enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
            NSLog(@"key=%@ : obj=%@",key,obj);
        }];
        //字典对象写到文件中
        //通过读文件写进字典
        
        NSMutableDictionary* mutableDic = [[NSMutableDictionary alloc]init];
        [mutableDic setDictionary:concent3];
        [mutableDic removeObjectForKey:@"emial"];
        [mutableDic removeObjectsForKeys:@[@"age",@"tel"]];
      
        [mutableDic setObject:@30 forKey:@"age"];
        NSLog(@"%@",mutableDic);
        

        
        
    }
    return 0;
}