如何以我当前的设置为iPhone应用程序保存文件？

Question

我不能为我的生活弄清楚如何保存我的数据我目前的设置！我试图使用NSUserDefaults，但因为我使用自定义对象，它不起作用。我一直在试图弄清楚如何使用NSKeyedArchiver，但我无法弄清楚在哪里实现它。

AG_AddItemViewController.h

#import <UIKit/UIKit.h> 
#import "AG_Storage.h" 

@interface AG_AddItemViewController : UIViewController 

@property AG_Storage *store; 


@end 

AG_AddItemViewController.m

#import "AG_AddItemViewController.h" 

@interface AG_AddItemViewController() 

@property(weak,nonatomic)IBOutlet UITextField *textField; 
@property(weak,nonatomic)IBOutlet UIButton *doneButton; 
@property IBOutlet UIDatePicker *datePicker; 
@property NSMutableArray *defaultsArray; 

@end 

@implementation AG_AddItemViewController 


- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
{ 


    if (sender != self.doneButton) return; 

    if (self.textField.text.length > 0) { 
     self.store =[[AG_Storage alloc] init]; 
     self.store.itemName = self.textField.text; 
     self.store.completed = NO; 

     NSDate *dateChosen = self.datePicker.date; 
     self.store.creationDate = dateChosen; 
     NSLog(@"%@", self.store); 

     [self.defaultsArray addObject:self.textField.text]; 
    } 

} 


- (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.defaultsArray = [[NSMutableArray alloc] init]; 

} 

- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 


@end 

AG_Storage

#import <Foundation/Foundation.h> 

@interface AG_Storage : NSObject 

@property NSString *itemName; 
@property BOOL *completed; 
@property NSDate *creationDate; 
@property NSDate *todaysDate; 

@end 

AG_ViewController.h

#import <UIKit/UIKit.h> 

@interface AG_ViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>{ 

    IBOutlet UITableView *tableView; 
    IBOutlet UILabel *todaysDate; 
    IBOutlet UILabel *subtractDate; 
    IBOutlet UILabel *addDate; 
} 
@end 

AG_ViewController.m

#import "AG_ViewController.h" 
#import "AG_Storage.h" 
#import "AG_AddItemViewController.h" 

@interface AG_ViewController() 

@property NSMutableArray *mainArray; 
@property NSMutableArray *yesterdayArray; 
@property NSMutableArray *tomorrowArray; 
@property NSDate *todayDate; 
@property NSDate *tomorrowsDate; 
@property NSDate *yesterdaysDate; 

@end 

@implementation AG_ViewController 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    self.mainArray = [[NSMutableArray alloc] init]; 
    self.yesterdayArray = [[NSMutableArray alloc]init]; 
    self.tomorrowArray = [[NSMutableArray alloc]init]; 
    [self loadInitialData]; 
} 

- (void)loadInitialData 
{ 
    // Do any additional setup after loading the view, typically from a nib. 




    //NSDate Info 

    NSTimeInterval secondsPerDay = 24 * 60 * 60; 
    NSDate *today = [[NSDate alloc]init]; 
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init]; 
    [dateFormat setDateFormat:@"MMMM dd, yyyy"]; 

    self.todayDate = today; 
    self.tomorrowsDate = [today dateByAddingTimeInterval: secondsPerDay]; 
    self.yesterdaysDate = [today dateByAddingTimeInterval: -secondsPerDay]; 

    NSString *todayString = [dateFormat stringFromDate:self.todayDate]; 
    NSString *tomorrowString = [dateFormat stringFromDate:self.tomorrowsDate]; 
    NSString *yesterdayString = [dateFormat stringFromDate:self.yesterdaysDate]; 

    todaysDate.text = todayString; 
    addDate.text = tomorrowString; 
    subtractDate.text = yesterdayString; 

    AG_Storage *theDateToday = [[AG_Storage alloc]init]; 
    theDateToday.todaysDate = self.todayDate; 


    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 
    [defaults arrayForKey:todayString]; 
    NSLog(@"Tried to load..."); 
    [defaults synchronize]; 



} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ 
    return [self.mainArray count]; 
} 


- (UITableViewCell *)tableView:(UITableView *)tableViewer cellForRowAtIndexPath:(NSIndexPath *)indexPath{ 

    UITableViewCell *cell = [tableViewer dequeueReusableCellWithIdentifier:@"thisCell"]; 
    AG_Storage *toDoItem = [self.mainArray objectAtIndex:indexPath.row]; 
    cell.textLabel.text = toDoItem.itemName; 



    if (toDoItem.completed) { 
     cell.accessoryType = UITableViewCellAccessoryCheckmark; 
    } 
    else{ 
     cell.accessoryType = UITableViewCellAccessoryNone; 
    } 

    return cell; 

} 



- (IBAction)unwindToList:(UIStoryboardSegue *)segue 
{ 

    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init]; 
    [dateFormat setDateFormat:@"MMMM dd, yyyy"]; 

    AG_AddItemViewController *source = [segue sourceViewController]; 
    AG_Storage *item = source.store; 

    NSDate *dateCreated = item.creationDate; 



    NSString *todayString = [dateFormat stringFromDate:self.todayDate]; 
    NSString *dateCreatedString = [dateFormat stringFromDate:dateCreated]; 
    NSString *tomorrowString = [dateFormat stringFromDate:self.tomorrowsDate]; 
    NSString *yesterdayString = [dateFormat stringFromDate:self.yesterdaysDate]; 


    //Set up file storage! 

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 


    if (item.itemName != nil) { 

     if ([dateCreatedString isEqualToString:todayString]) { 
      [self.mainArray addObject:item]; 
      [tableView reloadData]; 

      [defaults setObject:self.mainArray forKey:todayString]; 
      [defaults synchronize]; 
      NSLog(@"Saved"); 




     } 
     else if ([dateCreatedString isEqualToString:tomorrowString]){ 
      [self.tomorrowArray addObject:item]; 
      [tableView reloadData]; 

      NSLog(@"THIS WORKED TOO :D"); 
     } 
     else if ([dateCreatedString isEqualToString:yesterdayString]){ 
      [self.yesterdayArray addObject:item]; 
      [tableView reloadData]; 

      NSLog(@"THIS WORKED"); 
     } 
     else{ 

     } 
    } 
} 

- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 


#pragma mark - Table view delegate 

- (void)tableView:(UITableView *)tableViewer didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    [tableViewer deselectRowAtIndexPath:indexPath animated:NO]; 
    AG_Storage *tappedItem = [self.mainArray objectAtIndex:indexPath.row]; 
    tappedItem.completed = !tappedItem.completed; 
    [tableViewer reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone]; 

} 

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath { 
    // Return YES if you want the specified item to be editable. 
    return YES; 
} 

// Override to support editing the table view. 
- (void)tableView:(UITableView *)tableViews commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { 
    if (editingStyle == UITableViewCellEditingStyleDelete) { 
     [self.mainArray removeObjectAtIndex:indexPath.row]; 
     [tableViews deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; 
    } 
} 

@end 

我想，因为它似乎简单NSUserDefaults的使用，但如果做不到这就是好的。出于某种原因，我无法将头围绕在此。

编辑：这是我试图执行夸张的想法...

if (item.itemName != nil) { 

     NSData *data = [NSKeyedArchiver archivedDataWithRootObject:item]; 

     [[NSUserDefaults standardUserDefaults] setObject:data forKey:@"storageObjectKey"]; 
     [[NSUserDefaults standardUserDefaults] synchronize]; 

     if ([dateCreatedString isEqualToString:todayString]) { 
      [self.mainArray addObject:item]; 
      [tableView reloadData]; 

      NSData *data = [[NSUserDefaults standardUserDefaults] objectForKey:@"storageObjectKey"]; 
      AG_Storage *someStorageObject = [NSKeyedUnarchiver unarchiveObjectWithData:data]; 



      NSLog(@"%@", someStorageObject); 


      NSLog(@"Saved"); 


     } 

Answer 1

我的建议是有AG_Storage申报符合的NSSecureCoding协议，并落实在那里的编码方法。完成之后，将这些AG_Storage对象放入NSUserDefaults是件小事。

@interface AG_Storage : NSObject <NSSecureCoding> 

@end 

---

@implementation AG_Storage 

+ (BOOL)supportsSecureCoding { 

    return YES; 
} 

- (void)encodeWithCoder:(NSCoder *)encoder { 

    [encoder encodeObject:self.itemName forKey:@"itemNameKey"]; 
    [encoder encodeObject:@(self.completed) forKey:@"completedKey"]; 
    [encoder encodeObject:self.creationDate forKey:@"creationDateKey"]; 
    [encoder encodeObject:self.todaysDate forKey:@"todaysDateKey"]; // This one doesn't seem necessary to save, though I'm sure you would know better than I would. 
} 

- (id)initWithCoder:(NSCoder *)decoder { 

    if ([decoder respondsToSelector:@selector(decodeObjectOfClass:forKey:)]) // Secure coding is only available in iOS 6 
    { 
     self.itemName = [decoder decodeObjectOfClass:[NSString class] @"itemNameKey"]; 
     self.completed = [[decoder decodeObjectOfClass:[NSNumber class] forKey:@"completedKey"] boolValue]; 
     self.creationDate = [decoder decodeObjectOfClass:[NSDate class] forKey:@"creationDateKey"]; 
     self.todaysDate = [decoder decodeObjectOfClass:[NSDate class] forKey:@"todaysDateKey"]; 
    } 
    else 
    { 
     self.itemName = [decoder decodeObjectForKey:@"itemNameKey"]; 
     self.completed = [[decoder decodeObjectForKey:@"completedKey"] boolValue]; 
     self.creationDate = [decoder decodeObjectForKey:@"creationDateKey"]; 
     self.todaysDate = [decoder decodeObjectForKey:@"todaysDateKey"]; 
    } 

@end 

---

下一步就是要打破这种分解成的NSData存储的实例中NSUserDefaults：

NSData *data = [NSKeyedArchiver archivedDataWithRootObject:someAG_StorageObject]; 

[[NSUserDefaults standardUserDefaults] setObject:data forKey:@"storageObjectKey"]; 
[[NSUserDefaults standardUserDefaults] synchronize]; 

而且再取回：

NSData *data = [[NSUserDefaults standardDefaults] objectForKey:@"storageObjectKey"]; 
AG_Storage *someStorageObject = [NSKeyedUnarchiver unarchiveObjectWithData:savedData];