Có 80+ tài liệu thuộc chủ đề "cài đặt iphone"
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that you will add to the user interface. The permittedArrowDirections parameter allows you to specify from which direction the popover will appear with respect to the frame that you specifi ed in the fi rst parameter. popover to the UIKit framework. The last step is to clean up the infoButton and infoPopover properties in the dealloc and viewDidUnload methods:. Now,...
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In this chapter, you learned how to use some of the features of the iPhone SDK that are specifi c to the iPad. In Part II, you will learn about the Core Data framework. Core Data is a powerful library that you can use to create and manage data on the iPhone. Core Data comes with a powerful modeling tool...
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The schema for the persistent store is incompatible with current managed object model. The code fi rst determines if the Persistent Store Coordinator already exists. If the coordinator does not exist, the code must create it. In order to create the coordinator, you need to pass in a URL that points to the data store. You can see that the...
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However, to keep this example simple, you will just build a very simple interface in code.. Modify the TaskEntryViewController.h header to include instance variables for a. UITextField and the Managed Object Context. Declare the properties for the UITextField and the managed object context. Finally, modify the interface defi nition to indicate that you will be implementing the UITextFieldDelegate protocol. Specifi...
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Now that you have created the Product entity, you need to add the attributes of the entity.. The Product should have the attributes defi ned in the Entity - Relationship Diagram, as shown previously in Figure 6 - 2.. Select the Product entity in the data model.. With the entity selected, click the plus icon at the bottom of the...
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The NSError object that you return is a pointer to a pointer. This is a consequence of the fact that Objective - C passes all objects by value. If you passed the NSError pointer as a regular pointer, you would only be able to modify the NSError that you passed into the method. Accepting a pointer to a pointer allows...
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You can just add the taskTableView to the existing synthesize statement:. In the controllerDidChangeContent method, change the reference from self.tableview to self.taskTableView . (void)controllerDidChangeContent:(NSFetchedResultsController *)controller { [self.taskTableView reloadData];. Next, although you are not ready to implement the full functionality, you should add stub implementations of the action methods that you declared in the header fi le. This is helpful in...
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The last change in the RootViewController is to implement the TableView methods. You do need to implement the tableView:cellForRowAtIndexPath: to display the text property of the Task object for the row. You will also add some code to check the isOverdue transient property and display overdue tasks in red. Here is the code for tableView:cellForRowAtIndexPath:. static NSString *CellIdentifier = @”Cell”;....
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The user navigates to the EditLocationController by tapping the location cell on the ViewTaskController . The EditLocationController , as shown in Figure 7 - 9, allows the user to select a location, add new locations, and delete existing locations. You will also need to add a member variable and property for the NSFetchedResultsController that you will use to display your...
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You can see that you are once again using an NSDateFormatter to convert the NSDate object into a string for display in the TableViewCell. In the dealloc method, release the member variables that correspond to the class properties:. You have now fi nished implementing all of the edit controllers. The last thing that you need to do before you are...
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Here are the implementations for the numberOfSectionsInTableView and tableView:. The tableView:cellForRowAtIndexPath: and tableView:didSelectRowAtIndexPath: methods are the same as in the RootViewController . The following is the code for the tableView:. Change the text color if the task is overdue. CH007.indd 209. CH007.indd AM AM. There is one additional method that you need to implement tableView:. This method generates the titles...
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Setting and getting data using key - value coding. Implementing a loosely coupled application architecture with messaging and key - value observing. In the last three chapters, you learned about the fundamentals of the Core Data architecture — how to model your data and how to build a complete data - centric. This chapter provides a more detailed look at...
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Then, you use that knowledge to set the text of the appropriate label.. In the viewDidUnload method, you need to remove the KVO observers. You also set the properties of the class to nil . Release any retained subviews of the main view.. forKeyPath: method to remove your class as an observer of the umpireCounter . You call this method...
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You ’ ll fi x this error in the next section.. If the changes that you have made are not too drastic, you can easily accomplish this using a process called lightweight migration. In the previous section, I briefl y mentioned the mapping model.. Core Data uses the mapping model to determine how to map data from one schema model...
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In order to implement a subclass of NSOperation , at a minimum, you need to implement a custom initializer method that you use to confi gure your object for use and a main method that will perform the task. Once you have created your operation classes, you need to tell the system to execute them. You accomplish this by creating...
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Core Data does not bring relationships to a faulted object into memory until you access them. This behavior allows Core Data to conserve memory by keeping unused objects out of memory until you need them.. In this example, Core Data is preventing only one object, the Location, from being loaded. When using Core Data, you can specify the type of...
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Working with XML on the iPhone. Understanding XML and how to use it in your applications Parsing XML to obtain the data that you need. In the fi rst Part of the book, you learned how to get data out of an enterprise database and store it on the iPhone with SQLite. In the second Part, you learned how to...
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You will receive this message if the web server that you are calling requires authentication to complete the request. However, in a production application, you will often be required to authenticate to retrieve data from a URL.. When the connection:didReceiveAuthenticationChallenge: method is called, you can respond in one of three ways:. You can determine what the server expects by interrogating...
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First, for illustrative purposes, you log the name of the method that you are executing. In the parserDidStartDocument : method, you also initialize the inItemElement fl ag to NO because you are not currently in an item element. In the parserDidEndDocument method, you log that you have reached the end of the document.. This method receives the name of the...
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Create a node as a child of the attributed node. to the tree later. Add the text to the node xmlAddChild(attachNode, nodeText);. Add the node to the root xmlAddChild(rootNode, attachNode);. Display the text in the textview [self.textView setText:xmlString];. Release all of the structures in the document including the tree xmlFreeDoc(doc);. XML and the iPhone SDK ❘ 299. You should see...