iOS中NSDictionary和NSMutableDictionary的用法

//
//  main.m
//  DictonaryTest
//
//  Created by Unisk on 13-9-19.
//  Copyright (c) 2013年 Test. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Student.h"

#pragma mark 字典的创建
void createDictionary(){
    //Dictionary是不可变的
    NSDictionary *dict=[NSDictionary dictionaryWithObject:@"V" forKey:@"K"];
    //
    dict=[NSDictionary dictionaryWithObjectsAndKeys:@"V1",@"k1",@"V2",@"k2",@"V3",@"k3", nil];
    
    //
    //    NSArray *object=[NSArray arrayWithObjects:@"V1",@"V2",@"V3", nil];
    //    NSArray *key=[NSArray arrayWithObjects:@"G1",@"G2",@"G3", nil];
    //    dict=[NSDictionary dictionaryWithObjects:object forKeys:key];
    //
    //    NSLog(@"%zi",dict.count);
    //    NSLog(@"%@",dict);
    
    // 从字典中取值
    //    id value=[dict objectForKey:@"k2"];
    //    NSLog(@"%@",value);
    
    // 将字典中数据写入文件
    //    NSString *path=@"/Users/fdf/Desktop/dict.xml";
    //    [dict writeToFile:path atomically:YES];
    
    //将文件中的数据读取到字典之中
    NSString *path=@"/Users/fdf/Desktop/dict.xml";
    id dict1=[NSDictionary dictionaryWithContentsOfFile:path];
    NSLog(@"%@",dict1);
}

#pragma mark 字典的查询
void dictionaryFor(){
    
    NSDictionary *dict=[NSDictionary dictionaryWithObjectsAndKeys:@"V1",@"k1",@"V2",@"k2",@"V3",@"k3", nil];
    //   NSArray *array=[dict allKeys];
    //    NSArray *value=[dict allValues];
    // 传入多个key去查询value
    NSArray *value1= [dict objectsForKeys:[NSArray arrayWithObjects:@"k1",@"k2",@"k4", nil] notFoundMarker:@"not"];
    NSLog(@"%@ ",value1);
    
}

#pragma mark 字典的遍历
void dictionaryIterator(){
    
    NSDictionary *dict=[NSDictionary dictionaryWithObjectsAndKeys:@"V1",@"k1",@"V2",@"k2",@"V3",@"k3", nil];
    //快速遍历
    //    for (id key in dict) {
    //        id value=[ dict objectForKey:key];
    //        NSLog(@"%@=%@",key,value);
    //    }
    // while遍历
    //    NSEnumerator   *enums=[dict keyEnumerator];
    //    id key=nil;
    //    while (key=[enums nextObject]) {
    //        NSLog(@"%@==%@",key,[dict objectForKey:key]);
    //    }
    //block遍历
    [dict enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
        NSLog(@"%@==%@",key,obj);
        
        if ([key isEqualTo:@"k2"]) {//停止循环
            *stop=YES;
        }
        
    }];
    
}

#pragma mark 内存管理
void dictionaryMemory(){
    NSMutableDictionary *dict=[NSMutableDictionary dictionary];
    Student *stu1=[Student studentWithName:@"stu1"];
    [dict setObject:stu1 forKey:@"k"];
    [dict removeObjectForKey:@"k"];
     NSLog(@"%zi",[ stu1 retainCount]);
    
    
    
    //    Student *stu2=[Student studentWithName:@"stu2"];
    //    Student *stu3=[Student studentWithName:@"stu3"];
    
    //    NSDictionary *dict=[NSDictionary dictionaryWithObjectsAndKeys:stu1,@"k1",stu2,@"k2",stu3,@"k3", nil];
    //    NSMutableDictionary *dict=[NSMutableDictionary dictionaryWithObjectsAndKeys:stu1,@"k1",stu2,@"k2",stu3,@"k3", nil];
    
    //    NSLog(@"%zi",[ stu1 retainCount]);
    
    //    [dict removeAllObjects];
    //    [dict removeObjectForKey:@"k2"];
    //    [dict release];
    //    [dict removeAllObjects];
    //    NSLog(@"%zi",[ stu1 retainCount]);
    
    
}

int main(int argc, const char * argv[])
{
    
    @autoreleasepool {
        dictionaryMemory();
    }
    return 0;
}

#import <Foundation/Foundation.h>

@interface Student : NSObject

@property (nonatomic,retain) NSString *name;

+(id)studentWithName:(NSString *)name;

@end

#import "Student.h"

@implementation Student

#pragma mark 构造方法
+(id)studentWithName:(NSString *)name{
    Student *stu= [[[Student alloc] init] autorelease];
    stu.name=name;
    return  stu ;
}

#pragma mark 自动释放内存
-(void)dealloc{
    NSLog(@"%@ 被销毁了",_name);
    [_name release];
    [super dealloc];
}

@end