Có 100+ tài liệu thuộc chủ đề "thủ thuật lập trình iphone"
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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...
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You will be using these frameworks in your LocationSearchViewController class. Therefore, you will need to import the headers for these frameworks in the LocationSearchViewController.h header. The user interface for the application consists of a search bar to accept the search criteria from the user and a map view that you will use to display the search results. Because you need...
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[self.responseData setLength:0];. Next, you will implement the connection:didReceiveData: method. NSLog (@”connection:didReceiveData:”);. Append the received data to our responseData property [self.responseData appendData:data];. Here, you convert the response data to a string, clean up the connection, and call the method that you will write to parse the XML:. NSLog (@”connectionDidFinishLoading:”);. initWithData:self.responseData encoding:NSUTF8StringEncoding];. Finally, you will implement the connection:didFailWithError: method to log that...
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You will pass this struct to the mapView to defi ne the region that you want to display. You will center the map on the coordinate that you receive from Core Location.. Next, you tell the mapView to set the region displayed on the map and to animate the transition to your new region. For the next step, you need...
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The response will contain the most relevant words and phrases from the text that you sent into the service, in order of relevance. The response that I received when I sent the declaration to the web service looked like this:. powers of the earth <. when in the course of human events <. You need to implement the parseXML function,...
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Take a second and see if you can discover the memory leak on your own. This memory is now unrecoverable, resulting in a memory leak.. Build and run the application. When the simulator comes up, click on the Go button. You should see this text in the console: theString is: This is a string. Analyzing a Memory Leak in Instruments....
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bindex.indd 359. bindex.indd PM PM. collection operators, 221–222. bindex.indd 360. bindex.indd 361. keyboard, dismissing, 335 keyboard shortcuts, Xcode, 9 KeyPath parameter, 223 keypaths, 220–221. values from objects, 221 keys, 220–221. bindex.indd 362. managedObjectContext getter method, 130 managing memory, 170–171. allocating, arrays, 10 autorelease message, 41 releasing, 170–171 memory leaks, 347–348. MemoryLeaker, 348–349 memory management, 170–171. bindex.indd 363. methods – methods....
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Designing the. iPhone User Experience. A User-Centered Approach. to Sketching and Prototyping iPhone Apps. SUZANNE GINSBURG. ptg Many of the designations used by manufacturers and sellers to distinguish their products are. Where those designations appear in this book, and the publisher was aware of a trademark claim, the designations have been printed with initial capital letters or in all capitals.....
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PART THREE: Developing Your App Concept. How Much of the App Should I Prototype. The iPhone SDK. Chapter 8: Usability-Testing App Concepts. What Is Usability Testing. Why Usability Testing. Usability-Testing Methods. Traditional Usability Testing. Usability-Testing Timeline. Guerrilla Usability Testing. Branding via the User Experience. For most apps, it boils down to one thing: the user experience. All of the elements...
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User interface design. Strictly defined, user interface (UI) design refers to the design of the “inter- face” between users and the underlying software. What This Book Teaches You. This book provides an end-to-end overview of the user-centered design process, specifically for iPhone applications. After reading this book, you will know how to. Conduct up-front user and competitive research to inform...