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;
}

//
//  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;
}