iOS

Deleting from Core Data

June 30, 2012 Denis Kutlubaev Leave a comment

Deleting objects from Core Data should not be recognized as deleting rows from SQLite table. It is like deleting objects from Object Graph. This is an example of deleting all rows for the current file number. I retrieve all NSManagedObject objects and delete them in cycle.

Source code

+ (BOOL)deleteScrollPositionsForFileNumber:(NSInteger)fileNumber {
    BOOL success;
    useDelegate
    NSManagedObjectContext *context = appDelegate.managedObjectContext;
    if (context == nil) {
        NSLog(@"Error: No context");
        success = NO;
        return success;
    }
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"fileNumber == %d", fileNumber];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"ScrollPosition" inManagedObjectContext:context];
    [fetchRequest setEntity:entity];
    [fetchRequest setPredicate:predicate];
    NSError *error = nil;
    NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
    NSLog(@"Number of deleted objects: %d", [fetchedObjects count]);
    for (NSManagedObject *object in fetchedObjects) {
        [context deleteObject:object];
    }
    success = YES;
    return success;
}

iOS

Change MBProgressHUD color

June 30, 2012 Denis Kutlubaev 1 Comment

To change the background color of MBProgressHUD comment this line and add this in MBProgressHUD.m in drawRect method:

    //CGContextSetGrayFillColor(context, 0.0f, self.opacity);
    CGFloat fillColor[4]    = {0.0,0.0,1.0,1.0};
    CGContextSetFillColor(context, fillColor);

//CGContextSetGrayFillColor(context, 0.0f, self.opacity);

CGFloat fillColor[4] = {0.0,0.0,1.0,1.0};

CGContextSetFillColor(context, fillColor);

This code changes HUD color to blue.

iOS

Reload UITableView cells

June 30, 2012 Denis Kutlubaev Leave a comment

Sometimes it’s needed to reload only some of the rows of UITableView to save some time and energy and not reload whole the table. This is how it can be done:

NSIndexPath * indexPath = \
   [NSIndexPath indexPathForRow:row inSection:0]; 
[self.tableView reloadRowsAtIndexPaths: \
   [NSArray arrayWithObject:indexPath] \
   withRowAnimation:UITableViewRowAnimationMiddle];

NSIndexPath * indexPath = \

[NSIndexPath indexPathForRow:row inSection:0];

[self.tableView reloadRowsAtIndexPaths: \

[NSArray arrayWithObject:indexPath] \

withRowAnimation:UITableViewRowAnimationMiddle];

iOS

Save current position in UIScrollView and then scroll to this position

June 28, 2012 Denis Kutlubaev Leave a comment

To save a position of the current scroll view use this method:

- (void)savePosition {
    positionY = webView.scrollView.contentOffset.y;
    NSLog(@"positionY:%d", positionY);
}

- (void)savePosition {

positionY = webView.scrollView.contentOffset.y;

NSLog(@"positionY:%d", positionY);

}

To scroll programmatically to the saved position use this method:

- (void)scrollToYPosition:(int)positionY {
    [self.webView.scrollView setContentOffset: \
CGPointMake(self.webView.scrollView.contentOffset.x, positionY)];
}

- (void)scrollToYPosition:(int)positionY {

[self.webView.scrollView setContentOffset: \

CGPointMake(self.webView.scrollView.contentOffset.x, positionY)];

}

iOS

How to build MailCore framework on iOS

June 25, 2012 Denis Kutlubaev Leave a comment

MailCore is a Cocoa e-mail framework built by Matt Ronge that is the core of the e-mail client Kiwi. MailCore provides a nice set of objects for working with IMAP, MIME and SMTP, all of which use the C e-mail library LibEtPan. Here is some short information about MailCore. This is short documentation on MailCore from Matt Ronge. Official website is here.

To make it run on your iOS simulator, do the following:

Download MailCore from GitHub:

Default

git clone https://github.com/mronge/MailCore.git cd MailCore/ git submodule init git submodule update

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git clone https://github.com/mronge/MailCore.git
cd MailCore/
git submodule init
git submodule update
Build m4, autoconf, automake, libtool on Mac OS X Lion using this post.
Run update.sh script in MailCore to build and install everything before opening it in Xcode. If you don’t know, how to run shell scripts, read this

Open MessageSender project in MailCore library. Select MessageSender to build. It will not do anything. To make it sending a test message write the following code in ViewDidLoad:

CTCoreMessage myMessage = [[CTCoreMessage alloc] init];
    
// Set To
CTCoreAddress *addrTo1 = [CTCoreAddress address];
[addrTo1 setEmail:@"Your E-mail1"];
CTCoreAddress *addrTo2 = [CTCoreAddress address];
[addrTo2 setEmail:@"E-mail2"];
/*CTCoreAddress *addrTo3 = [CTCoreAddress address];
[addrTo3 setEmail:@"E-mail3"];*/
[myMessage setTo:[NSSet setWithObjects:addrTo1, addrTo2, nil]];
  
// Set From 
CTCoreAddress *addrFrom = [CTCoreAddress address];
[addrFrom setEmail:@"Your E-mail"];
[addrFrom setName:@"Your Name"];
[myMessage setFrom:[NSSet setWithObject:addrFrom]];
   
[myMessage setSubject:@"Test Mail Core"];
[myMessage setHTMLBody:@"This is a test HTML message"];
   
[CTSMTPConnection sendMessage:myMessage \
server:@"smtp.mail.ru" username:@"YourUserName" \
password:@"YourPassword" port:587 useTLS:YES useAuth:YES];

CTCoreMessage myMessage = [[CTCoreMessage alloc] init];

// Set To

CTCoreAddress *addrTo1 = [CTCoreAddress address];

[addrTo1 setEmail:@"Your E-mail1"];

CTCoreAddress *addrTo2 = [CTCoreAddress address];

[addrTo2 setEmail:@"E-mail2"];

/*CTCoreAddress *addrTo3 = [CTCoreAddress address];

[addrTo3 setEmail:@"E-mail3"];*/

[myMessage setTo:[NSSet setWithObjects:addrTo1, addrTo2, nil]];

// Set From

CTCoreAddress *addrFrom = [CTCoreAddress address];

[addrFrom setEmail:@"Your E-mail"];

[addrFrom setName:@"Your Name"];

[myMessage setFrom:[NSSet setWithObject:addrFrom]];

[myMessage setSubject:@"Test Mail Core"];

[myMessage setHTMLBody:@"This is a test HTML message"];

[CTSMTPConnection sendMessage:myMessage \

server:@"smtp.mail.ru" username:@"YourUserName" \

password:@"YourPassword" port:587 useTLS:YES useAuth:YES];

Use this method to retrieve message subjects from Inbox of your mail:

- (IBAction)retrieveClicked:(id)sender {
    CTCoreAccount *account = [[CTCoreAccount alloc] init];
    [account connectToServer:@"imap.yandex.ru" port:143 \
 connectionType:CONNECTION_TYPE_PLAIN authType:IMAP_AUTH_TYPE_PLAIN \
 login:@"YOUR USERNAME" password:@"YOUR PASSWORD"];
    
    NSSet *subFolders = [account subscribedFolders];
    
    CTCoreFolder *inbox = [account folderWithPath:@"INBOX"];
    
    NSSet *messageList = [inbox messageObjectsFromIndex:1 \
 toIndex:0];
    
    for (CTCoreMessage *message in messageList) {
        NSLog(@"%@", [message subject]);
    }
}

- (IBAction)retrieveClicked:(id)sender {

CTCoreAccount *account = [[CTCoreAccount alloc] init];

[account connectToServer:@"imap.yandex.ru" port:143 \

connectionType:CONNECTION_TYPE_PLAIN authType:IMAP_AUTH_TYPE_PLAIN \

NSSet *subFolders = [account subscribedFolders];

CTCoreFolder *inbox = [account folderWithPath:@"INBOX"];

NSSet *messageList = [inbox messageObjectsFromIndex:1 \

toIndex:0];

for (CTCoreMessage *message in messageList) {

NSLog(@"%@", [message subject]);

}

Official MailCore website.

iOS

What’s new in iOS 6: developer-related features

June 21, 2012 Denis Kutlubaev Leave a comment

This is the link for Apple Developers.

Brief content (developer-related features):

iOS 6.0

Maps
In addition to the new map tiles provided by Apple, the Maps app and MapKit framework now support additional interactions with other apps.

Social Framework
The Social framework (Social.framework) provides a simple interface for accessing the user’s social media accounts.

Pass Kit
Pass Kit is a new technology that uses web services, a new file format, and an Objective-C framework (PassKit.framework) to implement support for downloadable passes.

Game Center
Game Center has been updated and new features have been added to improve the game playing experience.

Reminders
The Event Kit framework now includes interfaces for creating and accessing reminders on the user’s device.

In-App Purchase
The Store Kit framework (StoreKit.framework) now supports the purchasing of iTunes content inside your app and provides support for having downloadable content hosted on Apple servers

Collection Views
The UICollectionView class offers a new way to present ordered data to users. With a collection view object, you are now able to define the presentation and arrangement of embedded views

UI State Preservation
State preservation makes it easier for apps to restore their user interface to the state it was in when the user last used it.

Auto Layout
Auto layout improves upon the “springs and struts” model previously used to lay out the elements of a user interface. With auto layout, you define rules for how to lay out the elements in your user interface.

Data Privacy
In addition to location data, the system now asks the user’s permission before allowing third-party apps to access certain user data

Additional Framework Enhancements

Android

Как закрыть Терминал из командной строки

June 13, 2012 Denis Kutlubaev Leave a comment

Закрыть его можно, но это сложно. Проще нажать Cmd+Q :

$ osascript -e 'tell application "Terminal" to quit'

1	$ osascript -e 'tell application "Terminal" to quit'

Android

Добавление и переход на номер строки в Vim

June 13, 2012 Denis Kutlubaev Leave a comment

Чтобы добавить номер строки в редакторе Vim, напишите следующее:

:set number (or nu)

1	:set number (or nu)

перед тем как зайти в режим редактирования. (там же, где пишете :wq, чтобы выйти)

Чтобы сразу перейти к определенной строке (с ошибкой, например), напишите:

vim +31 Hello_world.pl

1	vim +31 Hello_world.pl

Здесь 31 – номер строки, Hello_world.pl – редактируемый файл (Perl)

Android

Delete files by mask in Bash (Terminal)

June 12, 2012 Denis Kutlubaev Leave a comment

Go to the folder, where you want to delete for instance all mp3 files in this folder and it’s subfolders and type this:

$ for i in $( find . -name "*.mp3" ); do rm -f $i; done

1	$ for i in $( find . -name "*.mp3" ); do rm -f $i; done

If you want to delete files by mask only in current folder, type this:

$ rm -rf *.mp3

1	$ rm -rf *.mp3

iOS

Creating Local SVN Repository for Project

June 12, 2012 Denis Kutlubaev Leave a comment

$ svnadmin create RepositoryName

1	$ svnadmin create RepositoryName

2. While in the project folder:

$ svn import
 "file:///Users/user/RepositoryName/" -m "Initial import"

1 2	$ svn import "file:///Users/user/RepositoryName/" -m "Initial import"

3. Create a project folder:

$ mkdir "~/Users/user/Documents/ProjectFolder"

1	$ mkdir "~/Users/user/Documents/ProjectFolder"

4. Go to the documents folder:

$ cd "~/Users/user/Documents/"

1	$ cd "~/Users/user/Documents/"

5. Check out from repository:

$ svn checkout "file:///Users/user/RepositoryName/" ProjectFolder

1	$ svn checkout "file:///Users/user/RepositoryName/" ProjectFolder

Alwawee

Monthly Archives: June 2012

Deleting from Core Data

Change MBProgressHUD color

Reload UITableView cells

Save current position in UIScrollView and then scroll to this position

How to build MailCore framework on iOS

What’s new in iOS 6: developer-related features

Как закрыть Терминал из командной строки

Добавление и переход на номер строки в Vim

Delete files by mask in Bash (Terminal)

Creating Local SVN Repository for Project

iOS Development