3

我正在创建一个多用户 iPhone 应用程序，并且正在尝试完成用户登录过程中的编码。我可以成功创建一个帐户，并将用户输入的数据存储到 Core Data DB 中，并将 pin（密码）存储到 Keychain 中，所以现在我正在尝试完成登录过程。下面列出的以下代码是我到目前为止所拥有的，我想知道我需要做什么才能完成登录过程。

- (IBAction)processLogin:(id)sender {

// hide keyboard
[_textFieldUsername resignFirstResponder];
[_textFieldPin resignFirstResponder];


// First - make activity indicator visible, then start animating, then turn of wrong user / pin label
_welcomeActivityIndicator.hidden = FALSE;
[_welcomeActivityIndicator startAnimating];
[_wrongUserPin setHidden:YES];

// check if username and pin text fields are populated
if ([_textFieldUsername.text length ] == 0 &&  [_textFieldPin.text length ] == 0)
{
    [_welcomeActivityIndicator stopAnimating];
    [_wrongUserPin setHidden:NO];   
}

// CORE DATA    
NSFetchRequest *request= [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Account" inManagedObjectContext:_managedObjectContext];
NSPredicate *predicate =[NSPredicate predicateWithFormat:@"username=%@",self.textFieldUsername.text];

//check pin
Account *pinAccount = [[Account alloc] init];
[pinAccount.password isEqualToString:_textFieldPin.text];

[request setEntity:entity];
[request setPredicate:predicate];

NSError *error = nil;

NSArray *array = [_managedObjectContext executeFetchRequest:request error:&error];
if (array != nil) {
    NSUInteger count = [array count]; // may be 0 if the object has been deleted.
    NSLog(@"Username may exist, %@",count);
}

else {
    NSLog(@"Username does not exist.");
}

// TODO - put this in proper place - play audio bell if user logs in correctly
CFBundleRef mainBundle = CFBundleGetMainBundle();
CFURLRef soundFileURLRef;
soundFileURLRef = CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"Glass", CFSTR("aiff"), NULL);
UInt32 soundID;
AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
AudioServicesPlaySystemSound(soundID);

// TODO - put this in proper place - Load ViewControllerHome
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
ViewControllerHome *home = (ViewControllerHome *)[storyboard instantiateViewControllerWithIdentifier:@"Home"];
[self presentModalViewController:home animated:YES];

}

Account和AccountBase类文件m和h如下所示：

Account.h http://pastie.org/4149299

Account.m http://pastie.org/4149296

AccountBase.h http://pastie.org/4149301

AccountBase.m http://pastie.org/4149302

我将不胜感激任何想法或想法，并感谢您的阅读。

4

2 回答 2

1

我能够使用以下代码完成登录过程。

- (IBAction)processLogin:(id)sender {

// hide keyboard
[_textFieldUsername resignFirstResponder];
[_textFieldPin resignFirstResponder];


// First - make activity indicator visible, then start animating, then turn of wrong user / pin label
_welcomeActivityIndicator.hidden = FALSE;
[_welcomeActivityIndicator startAnimating];
[_wrongUserPin setHidden:YES];

// check if username and pin text fields are populated
if ([_textFieldUsername.text length ] == 0 &&  [_textFieldPin.text length ] == 0)
{
    [_welcomeActivityIndicator stopAnimating];
    [_wrongUserPin setHidden:NO];   
}

// CORE DATA
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Account" inManagedObjectContext:_managedObjectContext];

// set entity for request
[request setEntity:entity];

// filter results using a predicate
NSPredicate *pred =[NSPredicate predicateWithFormat:(@"username = %@"), _textFieldUsername.text];

// set predicate for the request
[request setPredicate:pred];

NSError *error = nil;

// store DB usernames in results array
NSArray *results = [_managedObjectContext executeFetchRequest:request error:&error];

NSLog(@"The returned results are %@",results);


// check text field against results stored in DB
for (Account *anAccount in results) {
    if ([anAccount.username isEqualToString:_textFieldUsername.text]){
        NSLog(@"Your username exists");
        if ([anAccount.password isEqualToString:_textFieldPin.text]){
            NSLog(@"Your pin is correct");

            // TODO - put this in proper place - play audio bell if user logs in correctly
            CFBundleRef mainBundle = CFBundleGetMainBundle();
            CFURLRef soundFileURLRef;
            soundFileURLRef = CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"Glass", CFSTR("aiff"), NULL);
            UInt32 soundID;
            AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
            AudioServicesPlaySystemSound(soundID);

            // TODO - put this in proper place - Load ViewController(Root)Home
            if([anAccount.username isEqualToString:@"root"])
            {
                UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
                ViewControllerRootHome *roothome = (ViewControllerRootHome *)[storyboard instantiateViewControllerWithIdentifier:@"rootHome"];
                [self presentModalViewController:roothome animated:YES];
            }
            else {
                UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
                ViewControllerHome *home = (ViewControllerHome *)[storyboard instantiateViewControllerWithIdentifier:@"Home"];
                [self presentModalViewController:home animated:YES];
            }
        }
        else {
            NSLog(@"Your pin is wrong");
            [_welcomeActivityIndicator stopAnimating];
            [_wrongUserPin setHidden:NO];
            }
        }
    else {
        NSLog(@"Your username was not found");
        [_welcomeActivityIndicator stopAnimating];
        [_wrongUserPin setHidden:NO];
        }
    }

}
于 2012-06-28T02:19:26.910 回答
0

我相信您滥用核心数据。它并不像 sqlite 那样使用，始终运行始终可查询。(http://cocoawithlove.com/2010/02/differences-between-core-data-and.html)

您正在尝试保留用户数据库，但也过于复杂。在内存中，应用程序可以使用NSMutableArray您自己的对象来跟踪用户名、标签

所以你会有你的课：

interface Alcoholic : NSObject

@property(nonatomic,retain)NSString * username;
@property(nonatomic,retain)NSString * pin;
@property(nonatomic,retain)NSString * tab;
@end

在添加这些的代码部分中，它将有一个可变数组

 NSMutableArray * alcoholics = [[NSMutableArray alloc]init];

- (IBAction)processLogin:(id)sender {

int i = 0;
while (i<alcoholics.count)
{
 Aloholic = [alcoholics objectAtIndex:i];
if(self.textFieldUsername.text == Aloholic.username)
   NSLog(@"Username may exist, %@",count);
}

else {
    NSLog(@"Username does not exist.");
}
}

ETC...

因为我确定您的下一个问题是如何使其持久化，这就是核心数据发挥作用的地方。

在您的应用程序委托中获取酗酒者数组并在应用程序打开和关闭时将其保存到核心数据

-(void)save
{
     //use core data to save needed data persitently

     self.Values = [NSEntityDescription
                       insertNewObjectForEntityForName:@"processLoginClass" 
                       inManagedObjectContext:[self managedObjectContext]];

          self.Values.alcoholics =  self.processLoginClass.alcoholics;

     }

     NSError *error;
     if (![[self managedObjectContext] save:&error]) 
     {
          NSLog(@"Couldn't save state information: %@", [error localizedDescription]);
     }
}

-(void)load
{
     //use core data to load needed data 

     NSError *error;
     NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
     NSEntityDescription *entity = [NSEntityDescription entityForName:@"Values" 
                                               inManagedObjectContext:[self managedObjectContext]];
     [fetchRequest setEntity:entity];

     NSArray *fetchedObjects = [[self managedObjectContext] executeFetchRequest:fetchRequest error:&error];
     for (processLoginClass *info in fetchedObjects) 
     {
          [self.processLoginClass setAlcholics:info.alcholics];
     }      
}
于 2012-06-26T00:54:55.893 回答