iOS歸檔與解歸檔,持久化儲存

iOS歸檔與解歸檔,持久化儲存
點此下載iOS歸檔,持久化儲存,解歸檔詳細工程

//資料持久化的本質:將資料讀取成檔案儲存在本地. 沙箱機制就是系統針對於每一個程式在本地產生的檔案夾(名字隨機產生), 對於不同的應用程式, 不能訪問其他應用程式沙箱內的內容, 對於該應用程式內容起到保護作用:1 Documents:用來儲存長久儲存的資料 2 xxx.app:應用程式的包, 包含應用程式載入所需的所有資源(readonly唯讀, 不可修改), 平時使用的NSBundle就是該包 3 Library: 1) Caches:本機快取, 儲存想暫時儲存的資料(Videos, Musics, Images) 比如:下載的視頻, 音頻, 圖片都儲存在該檔案夾下 2) Preferences:儲存使用者的喜好設定, 比如程式是否是第一次啟動 4 tmp:儲存還未下載完的視頻, 音頻, 當下載完後, 將檔案轉移到Caches檔案夾下#import "WYLReadAndWriteViewController.h"#import "WYLArchive.h"@interface WYLReadAndWriteViewController ()@end@implementation WYLReadAndWriteViewController- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view.    self.view.backgroundColor = [UIColor whiteColor];    self.navigationItem.title = @"檔案讀寫";    UITextField *textField = [[UITextField alloc]initWithFrame:CGRectMake(40, 84, 220, 40)];    textField.tag = 100;    textField.placeholder  = @"請輸入內容";    textField.delegate = self;    textField.borderStyle = UITextBorderStyleRoundedRect;    [self.view addSubview:textField];    [textField release];    UITextField *textField2 = [[UITextField alloc]initWithFrame:CGRectMake(40, 174, 220, 40)];    textField2.tag = 101;    textField2.placeholder  = @"顯示上一個輸入框的內容";    textField2.delegate = self;    textField2.borderStyle = UITextBorderStyleRoundedRect;    [self.view addSubview:textField2];    [textField2 release];    UIButton *writeButton = [UIButton buttonWithType:UIButtonTypeSystem];     writeButton.frame =  CGRectMake(45, 260, 60, 30);    [writeButton setTitle:@"寫入" forState:UIControlStateNormal];    [writeButton addTarget:self action:@selector(write:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:writeButton];    UIButton *readButton = [UIButton buttonWithType:UIButtonTypeSystem];    readButton.frame = CGRectMake(190, 260, 60, 30);    [readButton setTitle:@"讀取" forState:UIControlStateNormal];    [readButton addTarget:self action:@selector(read:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:readButton];    UIButton *push = [UIButton buttonWithType:UIButtonTypeSystem];    push.frame = CGRectMake(120, 310, 60, 30);    [push setTitle:@"push" forState:UIControlStateNormal];    [push addTarget:self action:@selector(push:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:push];        }- (NSString *)getFilePath{    //用來擷取指定檔案夾的路徑:<#NSSearchPathDirectory directory#>:指定的檔案夾;<#NSSearchPathDomainMask domainMask#>:設定尋找的域, 我們自己的檔案都是儲存在永華域的;<#BOOL expandTilde#>:是否使用詳細路徑(絕對路徑) 因為最初該方法是使用與MAC OS下的, 而對於電腦系統來說, 可能會儲存多個使用者, 所以擷取到得使用者可能有多個, 所以傳回值類型是數組, 但是對於iOS下, 就要只有一個使用者, 所以數組中只有一個元素    /*    NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];    //2)拼接上要隱藏檔的路徑    NSString *newFilePath = [documentsPath stringByAppendingPathComponent:@"aa.txt"];    NSLog(@"%@", newFilePath);     */    NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];    NSString *newPath = [filePath stringByAppendingPathComponent:@"test.txt"];    NSLog(@"%@", newPath);    return newPath;}- (void)read:(UIButton *)button{    //每次寫入都會將之前的內容覆蓋掉, 若想保留之前的資料, 需要講之前的資料讀出, 然後將要儲存的資料拼接在一起, 一起存入    /*    NSString *newFilePath = [self getFilePath];    NSError *error = nil;    NSString *content = [NSString stringWithContentsOfFile:newFilePath encoding:NSUTF8StringEncoding error:&error];    UITextField *tf = (UITextField *)[self.view viewWithTag:101];    tf.text = content;     */    //字串從本地讀取    /*    NSString *filePath = [self getFilePath];    NSString *content = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];    UITextField *tf = (UITextField *)[self.view viewWithTag:101];    tf.text = content;     */    //數組從本地檔案讀取    NSString *filePath = [self getFilePath];//    NSArray *arr = [NSArray arrayWithContentsOfFile:filePath];    //從字典從本地讀取    NSDictionary *dic = [NSDictionary dictionaryWithContentsOfFile:filePath];    UITextField *tf = (UITextField *)[self.view viewWithTag:100];    UITextField *tf1 = (UITextField *)[self.view viewWithTag:101];    tf.text = dic[@"tf2"];    tf1.text = dic[@"tf1"];    }//檔案讀寫暫時只支援:NSString, NSArray, NSDictionary, NSData, 以及他們的子類.寫入檔案:writeToFile:(這是對象調用的方法), 讀取檔案:每一個類內建的能夠根據路徑建立對象的方法:[類名 類WithContentsOfFile]; 字串:[NSString stringWithContentsOfFile], 數組:[NSArray arrayWithContentsOfFile], 字典:[NSDictionary dictionaryWithContentsOfFile], 二進位流:[NSData dataWithContentsOfFile],(牢牢謹記:對於數組, 字典這樣的容器類, 內部的成員也必須是能夠實現檔案讀寫的八大類之一)- (void)write:(UIButton *)button{    //寫入時, 將第一個輸入框中的文字, 寫入到本地檔案    //1 擷取儲存的內容    UITextField *tf = (UITextField *)[self.view viewWithTag:100];    NSString *content = tf.text;    //2 擷取到所要儲存的檔案路徑    //1)擷取Documents檔案夾路徑    NSString *newFilePath = [self getFilePath];    //3 將內容儲存到指定檔案路徑//    NSError *error = nil;     //字串寫入本地檔案//    BOOL isSucceed = [content writeToFile:newFilePath atomically:YES encoding:NSUTF8StringEncoding error:&error];     //數組寫入本地檔案    UITextField *tf2 = (UITextField *)[self.view viewWithTag:101];    NSString *content1 = tf2.text;//    NSArray *arr = @[content, content1];//    BOOL isSucceed = [arr writeToFile:newFilePath atomically:YES];    //字典寫入本地檔案    NSDictionary *dic = @{@"tf1": content, @"tf2": content1};    BOOL isSucceed = [dic writeToFile:newFilePath atomically:YES];    NSLog(@"%d", isSucceed);    }- (void)push:(UIButton *)button{    WYLArchive *archivieVC = [[WYLArchive alloc]init];    [self.navigationController  pushViewController:archivieVC animated:YES];}- (BOOL)textFieldShouldReturn:(UITextField *)textField{    [textField resignFirstResponder];    return YES;}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}/*#pragma mark - Navigation// In a storyboard-based application, you will often want to do a little preparation before navigation- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{    // Get the new view controller using [segue destinationViewController].    // Pass the selected object to the new view controller.}*/@end#import "WYLArchive.h"#import "Person.h"@interface WYLArchive ()@end@implementation WYLArchive- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view.    self.view.backgroundColor = [UIColor whiteColor];    self.navigationItem.title = @"歸檔與反歸檔";    UITextField *textField = [[UITextField alloc]initWithFrame:CGRectMake(40, 84, 220, 40)];    textField.tag = 100;    textField.placeholder  = @"請輸入內容";    textField.borderStyle = UITextBorderStyleRoundedRect;    textField.delegate = self;    [self.view addSubview:textField];    [textField release];    UITextField *textField2 = [[UITextField alloc]initWithFrame:CGRectMake(40, 174, 220, 40)];    textField2.tag = 101;    textField2.placeholder  = @"顯示上一個輸入框的內容";    textField2.borderStyle = UITextBorderStyleRoundedRect;    textField2.delegate = self;    [self.view addSubview:textField2];    [textField2 release];    UIButton *fileButton = [UIButton buttonWithType:UIButtonTypeSystem];    fileButton.frame =  CGRectMake(45, 260, 60, 30);    [fileButton setTitle:@"歸檔" forState:UIControlStateNormal];    [fileButton addTarget:self action:@selector(file:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:fileButton];    UIButton *archiveButton = [UIButton buttonWithType:UIButtonTypeSystem];    archiveButton.frame = CGRectMake(190, 260, 60, 30);    [archiveButton setTitle:@"反歸檔" forState:UIControlStateNormal];    [archiveButton addTarget:self action:@selector(archive:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:archiveButton];}- (NSString *)getPath{    //獲得檔案夾的路徑    /*    NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];    NSString *newPath = [filePath stringByAppendingPathComponent:@"archive"];    return newPath;     */    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];    NSString *newPath = [path stringByAppendingPathComponent:@"archiver"];    return newPath;}- (void)file:(UIButton *)button{    //擷取輸入框的內容    UITextField *tf1 = (UITextField *)[self.view viewWithTag:100];    UITextField *tf2 = (UITextField *)[self.view viewWithTag:101];    /*    //封裝成Person對象    Person *person = [[Person alloc] initWithName:tf1.text gender:tf2.text age:18];    //1 建立歸檔對象    NSMutableData *data = [NSMutableData data];    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];    //2 歸檔    [archiver encodeObject:person forKey:@"person"];    [person release];    //3 結束歸檔, 當結束歸檔之後, 再歸檔無效    [archiver finishEncoding];    [archiver release];    //4 data寫入檔案    [data writeToFile:[self getPath] atomically:YES];     */    Person *person = [[Person alloc] initWithName:tf1.text gender:tf2.text age:18];    NSMutableData *data = [NSMutableData data];    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];    [archiver encodeObject:person forKey:@"archiver"];    [person release];    [archiver finishEncoding];    [archiver release];    [data writeToFile:[self getPath] atomically:YES];}- (void)archive:(UIButton *)button{    /*    //1 初始化NSMutableData對象    NSMutableData *data = [NSMutableData dataWithContentsOfFile:[self getPath]];    //2 建立一個反歸檔對象    NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];    //3 反歸檔    Person *person = [unarchiver decodeObjectForKey:@"person"];    //4 結束反歸檔    [unarchiver finishDecoding];    [unarchiver release];     */    NSMutableData *data = [NSMutableData dataWithContentsOfFile:[self getPath]];    NSKeyedUnarchiver *unarchive = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];    Person *person = [unarchive decodeObjectForKey:@"archiver"];    [unarchive finishDecoding];    [unarchive release];    UITextField *tf1 = (UITextField *)[self.view viewWithTag:100];    UITextField *tf2 = (UITextField *)[self.view viewWithTag:101];    tf1.text = person.gender;    tf2.text = person.name;}- (BOOL)textFieldShouldReturn:(UITextField *)textField{    [textField resignFirstResponder];    return YES;}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}/*#pragma mark - Navigation// In a storyboard-based application, you will often want to do a little preparation before navigation- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{    // Get the new view controller using [segue destinationViewController].    // Pass the selected object to the new view controller.}*/@end