
#import <Foundation/Foundation.h> @interface Student : NSObject <NSCoding>;
@property(nonatomic,strong)NSString* name;
@property(nonatomic,assign)int age;
@property(nonatomic,copy)NSString* tel; -(id)initWithName:(NSString*)name endAge:(int)age endTel:(NSString*)tel; @end #import "Student.h" @implementation Student
@synthesize name=_name,tel=_tel,age=_age;
-(id)initWithName:(NSString *)name endAge:(int)age endTel:(NSString *)tel
{
if (self=[super init]) {
self.name=name;
self.age=age;
self.tel=tel;
}
return self;
} -(void)encodeWithCoder:(NSCoder *)aCoder
{
NSLog(@"编码中。。。。");
[aCoder encodeObject:self.name forKey:@"name"];
[aCoder encodeInt:self.age forKey:@"age"];
[aCoder encodeObject:self.tel forKey:@"tel"];
// [aCoder encodeValueOfObjCType:@"" at:<#(const void *)#>] }
-(id)initWithCoder:(NSCoder *)aDecoder
{
NSLog(@"解码中。。。。");
self=[self initWithName:[aDecoder decodeObjectForKey:@"name"] endAge:[aDecoder decodeIntForKey:@"age"] endTel:[aDecoder decodeObjectForKey:@"tel"]]; return self;
} @end #import "ViewController.h"
#import "Student.h"
@interface ViewController ()
{
UITextField* _tf1;
UITextField* _tf2;
UITextField* _tf3;
}
@end @implementation ViewController - (void)viewDidLoad {
[super viewDidLoad];
[self encodeStu]; // Do any additional setup after loading the view, typically from a nib.
// Dispose of any resources that can be recreated
_tf1=[[UITextField alloc]initWithFrame:CGRectMake(, , , )]; _tf2=[[UITextField alloc]initWithFrame:CGRectMake(, , , )];
_tf2.keyboardType=UIKeyboardTypeDecimalPad; _tf3=[[UITextField alloc]initWithFrame:CGRectMake(, , , )]; _tf1.borderStyle=UITextBorderStyleRoundedRect;
_tf2.borderStyle=UITextBorderStyleRoundedRect;
_tf3.borderStyle=UITextBorderStyleRoundedRect;
[self.view addSubview:_tf1];
[self.view addSubview:_tf2];
[self.view addSubview:_tf3]; //进入后台,触发写文件方法,
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(write) name:UIApplicationDidEnterBackgroundNotification object:nil ];
//进入应用时触发
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(reade) name:UIApplicationDidBecomeActiveNotification object:nil ]; NSDictionary* dic=[[NSDictionary alloc]initWithObjectsAndKeys:@"name",@"xxx",@"age",@"",@"tel",@"", nil];
NSLog(@"%@",[dic objectForKey:@""]);
}
-(void)reade{
//读取文件路径
NSString * path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:]stringByAppendingPathComponent:@"writefile.text" ];
NSLog(@"read path :%@",path);
NSArray* arr=[NSArray arrayWithContentsOfFile:path];
_tf1.text=arr[];
_tf2.text=arr[];
_tf3.text=arr[]; } -(void)viewWillAppear:(BOOL)animated
{ } -(void)write{
NSString * path=[[NSBundle mainBundle]bundlePath]; //path是文件夹,那么就再加上文件名才是文件完整路径
NSString* path2=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) objectAtIndex:];
// path2 = [path stringByAppendingString:@"/writefiles.tet"];
path2= [path2 stringByAppendingPathComponent:@"writefile.text"]; NSLog(@"%@,%@",path,path2);
NSArray* writeArr=@[_tf1.text,_tf2.text,_tf3.text]; [writeArr writeToFile:path2 atomically:YES]; } //归档解决自定义对象
//数据持久化本质:保持状态跟数据 //归档调用,加密写入文件
-(void)loadView
{
[super loadView]; //从程序输入数据 并构建自定义对象(初始化要归档的对象,是数据的生成) Student* stu=[[Student alloc]initWithName:@"啊城" endAge: endTel:@""];
// NSArray* stu=[[NSArray alloc]initWithObjects:@"sss",@"aaaa",@"222", nil];
NSMutableData* data=[[NSMutableData alloc]init];
//构建归档器
NSKeyedArchiver* archiver=[[NSKeyedArchiver alloc]initForWritingWithMutableData:data];
//归档 没有储存动作,只负责编码
[archiver encodeObject:stu forKey:@"stu"];
//千万不能忘记,归档完毕马上调用
[archiver finishEncoding]; //写入文档
[data writeToFile:[[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:]stringByAppendingPathComponent:@"bba1.text" ] atomically:YES];
NSLog(@"111 Stu name is %@,gender is %d,tel is %@",stu.name,stu.age,stu.tel);
}
//解档
-(void)encodeStu{
//取数据,以待解码归档,注意一定要用NSDocumentDirectory
NSData* data= [NSData dataWithContentsOfFile:[[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:]stringByAppendingPathComponent:@"bba1.text" ]];
//解档器
NSKeyedUnarchiver* uA=[[NSKeyedUnarchiver alloc]initForReadingWithData:data];
//解档->还原对象,注意解档和键需要和归档一致
Student* stu=[uA decodeObjectForKey:@"stu"];
//解码器,中decodeObjectForKay方法,在解码过程中,会调用initWithCoder方法,并通过对象类型到类中调用已重写实现的initWithCoder方法 NSLog(@"2222 Stu name is %@,gender is %d,tel is %@",stu.name,stu.age,stu.tel);
//
[uA finishDecoding]; } -(void)dealloc{
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidBecomeActiveNotification object:nil];
} - (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning]; } @end