OC-1-8

//
//  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;
}