Phát triển ứng dụng cho iPhone và iPad - part 29 doc

... memory, the OS will tell certain parts of your application to unload. This will cause a time - consuming re - initialization to occur when the user needs to use these parts of your application again. ... great impact on performance — memory management. On embedded devices such as the iPhone and iPad, you need to be particularly concerned about memory as the iOS does not currentl...

Ngày tải lên: 04/07/2014, 21:20

... 41CH002.indd 41 9/20/10 2:31:37 PM9/20/10 2:31:37 PM 46 ❘ CHAPTER 2 THE IPHONE AND IPAD DATABASE: SQLITE LISTING 2-1 (continued) - (void)initializeDatabase { // Get the database from the application ... management in Objective - C are confusing, you should read Apple ’ s Memory Management Programming Guide for Cocoa, which can be found at http://developer .apple.com /iph...

Ngày tải lên: 04/07/2014, 21:20

... of the class: - (void)viewDidUnload { [super viewDidUnload]; self.infoLabel = nil; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (void)dealloc ... application ’ s UIApplication object. UIApplication is the core object at the root of all iPhone and iPad applications. UIApplication is a singleton class to which you can obtain a ref...

Ngày tải lên: 04/07/2014, 21:20

... 3; NSStoreModelVersionIdentifiers = ( ); NSStoreType = SQLite; NSStoreUUID = “762ED96 2-3 67C-476C-B4BD-076A6D1C33A9”; “_NSAutoVacuumLevel” = 2; }; reason = “The model used to open the store ... you open the Resources folder in Xcode and double - click on Tasks.xcdatamodel , you should see something similar to Figure 5 - 3. FIGURE 5 - 3: The default Object Model The...

Ngày tải lên: 04/07/2014, 21:20

... pre - defi ned formats or you can defi ne your own. For more information on using NSDateFormatter , look at the Xcode SDK documentation or browse to http://developer.apple.com /iphone/ library/documentation/ Cocoa/Reference/Foundation/Classes/NSDateFormatter_Class/Reference/Reference.html ... UITableView* taskTableView; } -( IBAction)toolbarSortOrderChanged:(id)sender; -( IBActi...

Ngày tải lên: 04/07/2014, 21:20

... get an error indicating that this is invalid. Multi - Field Validation Multi - fi eld validation is slightly more complicated than single - fi eld validation. Core Data will call two methods ... their superclass counterpart method. You have to call the superclass method because that method handles validation rules implemented in the model and calls the single - fi eld val...

Ngày tải lên: 04/07/2014, 21:20

... to ensure that your classes will be key - value coding – compliant. For example, the correct format for accessor methods is - var for the getter and - setVar for the setter. Defi ning properties ... methods generated by the framework will be KVC - compliant. There are additional rules for ensuring KVC compliance when your classes contain To - One or To - Many rel...

Ngày tải lên: 04/07/2014, 21:20

... 3; NSStoreModelVersionIdentifiers = ( ); NSStoreType = SQLite; NSStoreUUID = “6B5E801A-9B0 0-4 F1 7-8 58D-726679EE28C3”; }; reason = “The model used to open the store is incompatible with the ... this expressed on the right in Figure 9 - 6. Update User Interface Generate Numbers Update User Interface Generate Numbers FIGURE 9 - 6: Threaded versus non - threaded design...

Ngày tải lên: 04/07/2014, 21:20

... Timestamp > 200 5-0 5-0 2T00:07:22.895Z < /Timestamp > < Ack > Success < /Ack > < CorrelationID > 0000000 0-0 000000 0-0 000000 0-0 000000 0-0 000000 0-0 000000 0-0 000000000 < ... Release all of the structures in the document including the tree xmlFreeDoc (doc) ; xmlCleanupParser(); } XML and the iPhone SDK ❘ 299 CH010.indd 299...

Ngày tải lên: 04/07/2014, 21:20

... method called parseXML that you will invoke to start the XML processing: - (IBAction) extractTerms:(id)sender; - (void) parseXML; The complete header should look like this: #import < ... *extractedTermsTextView; @property (nonatomic, retain) NSMutableData *responseData; - (IBAction) extractTerms:(id)sender; - (void) parseXML; @end TermExtractViewController.h In...

Ngày tải lên: 04/07/2014, 21:20