vb.net print barcode labels Maintaining user preferences in Objective-C

Creator QR Code in Objective-C Maintaining user preferences

Download from Wow! eBook <www.wowebook.com>
QR Code 2d Barcode Creation In Objective-C
Using Barcode creation for iPhone Control to generate, create QR Code ISO/IEC18004 image in iPhone applications.
www.OnBarcode.com
Creating EAN128 In Objective-C
Using Barcode printer for iPhone Control to generate, create GS1-128 image in iPhone applications.
www.OnBarcode.com
Maintaining user preferences
Barcode Generation In Objective-C
Using Barcode generation for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Creating DataMatrix In Objective-C
Using Barcode creator for iPhone Control to generate, create Data Matrix ECC200 image in iPhone applications.
www.OnBarcode.com
Table 8.3 Different preference types let you create different tools on the Settings page. Preference PSChildPaneSpecifier PSGroupSpecifier Summary Points to a subpage of preferences Contains a group header for the current table section Points to a subpage containing a select list A UISlider A UITextField Shows the current, unchangeable value of the preference A UISwitch Default
Encode QR In Objective-C
Using Barcode maker for iPhone Control to generate, create QR Code JIS X 0510 image in iPhone applications.
www.OnBarcode.com
Printing Barcode In Objective-C
Using Barcode creator for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
PSMultiValueSpecifier PSSliderSpecifier PSTextFieldSpecifier PSTitleValueSpecifier
Make Code128 In Objective-C
Using Barcode encoder for iPhone Control to generate, create Code 128 Code Set A image in iPhone applications.
www.OnBarcode.com
EAN 8 Printer In Objective-C
Using Barcode encoder for iPhone Control to generate, create EAN-8 Supplement 5 Add-On image in iPhone applications.
www.OnBarcode.com
PSToggleSwitchSpecifier
Print QR Code ISO/IEC18004 In None
Using Barcode printer for Font Control to generate, create QR-Code image in Font applications.
www.OnBarcode.com
Quick Response Code Generator In VS .NET
Using Barcode printer for ASP.NET Control to generate, create Denso QR Bar Code image in ASP.NET applications.
www.OnBarcode.com
For any setting, the Type string always describes which sort of preference you re setting. Other settings define what you can change. For example, to change the text that appears in a PSGroupSpecifier, you adjust the Title string inside the PSGroupSpecifier dictionary. Changing the PSSliderSpecifier, PSTextFieldSpecifier, and PSToggleSwitchSpecifier is equally easy. The only thing to note on those is the Key string, which sets the name of the preference s variable. You ll need that name when you want to look it up from inside your program (a topic we ll return to).
QR-Code Reader In Visual Basic .NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
EAN13 Printer In Java
Using Barcode encoder for Java Control to generate, create European Article Number 13 image in Java applications.
www.OnBarcode.com
CREATING NEW SETTINGS
Code 39 Creation In None
Using Barcode encoder for Word Control to generate, create Code 3 of 9 image in Microsoft Word applications.
www.OnBarcode.com
EAN / UCC - 13 Printer In Java
Using Barcode creation for Java Control to generate, create EAN / UCC - 13 image in Java applications.
www.OnBarcode.com
The remaining three preferences are a bit harder to implement because you don t have a preexisting template for them sitting in the default Root.plist file. But all you have to do is create a dictionary that contains the right values. When you click individual rows in the plist editor, you ll see some iconic options to help you create new preferences. At any time, you can create new PreferenceSpecifiers (which is to say, new preferences) by clicking the plus (+) symbol to the right of the current row. You can likewise add to dictionaries or arrays by opening them and then clicking the indented row symbol to the right of the current row. A PSTitleValueSpecifier is an unchangeable preference. It shows the preference name and a word on the Settings page. Its dictionary includes a Type (string) of PSTitleValueSpecifier, a Title (string) that defines the name of the preference, a Key (string) that defines the variable name, and a DefaultValue (string). A PSMultiValueSpecifier is a select list that appears on a subpage. Its dictionary contains a Type (string) of PSMultiValueSpecifier, a Title (string), a Key (string), a DefaultValue (string), a Titles (array) that contains a number of String items, and a matched Values (array) that contains Number items. Figure 8.3 shows what these two items look like, laid out in Xcode.
Drawing UCC-128 In .NET
Using Barcode creator for .NET framework Control to generate, create GS1-128 image in .NET applications.
www.OnBarcode.com
1D Barcode Drawer In C#
Using Barcode creation for VS .NET Control to generate, create Linear Barcode image in VS .NET applications.
www.OnBarcode.com
Download from Wow! eBook <www.wowebook.com>
Reading Code 128B In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Barcode Generator In Java
Using Barcode maker for BIRT reports Control to generate, create Barcode image in BIRT reports applications.
www.OnBarcode.com
Data: actions, preferences, and files
Print GS1 - 13 In Java
Using Barcode encoder for Eclipse BIRT Control to generate, create EAN / UCC - 13 image in Eclipse BIRT applications.
www.OnBarcode.com
Data Matrix Encoder In .NET Framework
Using Barcode printer for .NET Control to generate, create ECC200 image in VS .NET applications.
www.OnBarcode.com
Figure 8.3 This display shows how a PSTitleValueSpecifier and a PSMultiValueSpecifier look in Xcode.
The last sort of setting, PSChildPaneSpecifier, does something totally different: it lets you create additional pages of preferences.
CREATING HIERARCHICAL SETTINGS
If necessary, you can have multiple pages of settings. To create a subpage, use the PSChildPaneSpecifier type. It should contain a Type (string) of PSChildPaneSpecifier, a Title (string), and a File (string) that contains the new plist file without extension. After you ve done this, you need to create your new plist file. There is currently no easy Add plist option, so we suggest copying your existing Root.plist file, renaming it, and going from there. We ve put together an example of all seven preference types in figure 8.4. It shows the types of preference files that you can create using Apple s built-in functionality. Now you know everything that s required to give your users a long list of preferences that they can set. But how do you use them from within Xcode
ACCESSING SETTINGS
Settings end up encoded as variables. As you saw when looking through the plist editor, each individual preference is an NSString, an NSArray, an NSNumber, or a Boolean. You can access these variables using the shared NSUserDefaults object. We already discussed this class in the last section; it so happens that Apple s settings bundle uses it, as we suggested you might. The functionality remains the same. You can create it as follows:
[NSUserDefaults standardUserDefaults];
Figure 8.4 As seen on an iPhone, in order from top to bottom, a Group, a TextField, another Group, a Switch, a TitleValue, a MultiValue, a ChildPane, a third Group, and a Slider
Copyright © OnBarcode.com . All rights reserved.