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This example generally follows the table view methodology that you learned in chapter 5. You use an array to set up your table view. In addition to a title, these (mutable) dictionaries include additional info about the switch that goes into the table view, including what it should be set to and what action it should call. This example shows one nuance we mentioned before: only NSObjects can be placed in an NSDictionary, so you have to encode a Boolean value in order to use it. The initWithStyle: method must do two other things. First, it must create a mutable array to hold all your switches for later access. You do all the creation B based on settingsList (or on whatever other means you used to pull in preferences data), because if you wait until you get to the table view methods, you can t guarantee the order in which they ll be created. If you didn t fill the switch list here, you could get an out-of-bounds error if, for example, the switch in row 1 was created before the switch in row 0. Note also that these switches are created with no particular location on the screen, because you ll place them later. Second, the method must move your table down a bit to account for the navigation bar at the top of the flipside page C. The methods that define the section count, the section head, and the row count are all pretty standard. It s the method that defines the contents of the rows D that s of interest, primarily because it contains code that takes advantage of the accessoryView property that we touched on in chapter 5. In this method, you read back the appropriate switch from your array and input it E. There s no real functionality in this preferences page that ultimately will depend on the needs of your program. But this skeleton should give you everything you need to get started. Afterward, you ll need to build your methods (here, setMusic: and setSounds:), which should access the switchList array, and then do the appropriate thing for your program when the switches are toggled. Switches are the most common element of a preferences page. The other common feature that you should consider programming is the select list. That s usually done by creating a subpage with a table view all its own. It should be set in UITableViewGrouped style, like this table. You ll probably allow users to checkmark one or more elements in the list.
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We re leaving one element out of this discussion: what to do with your users preferences after they ve set them. It s possible that you ll want to save user preferences only for the length of a single session, but it s our experience that that can be confusing and even annoying to users. More commonly, you should save preferences from one session to another. We offer three different ways to do so: Save the preferences in a file Section 8.3 talks about file access. You can either save the preferences in plain text or else use a more regulated format like XML, which is covered in chapter 14. Save the preferences in a database Section 9.2 covers this. Save the preferences using NSUserDefaults This option is discussed next.
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NSUserDefaults is a storage mechanism that s specific to user preferences, so we ll cover it here. Generally, NSUserDefaults is a persistent shared object that you can use to remember a user s preferences from one session to another. It s sort of like a preferences associative array. It has four major methods, listed in table 8.2.
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Table 8.2 Notable methods for NSUserDefaults Method standardUserDefaults objectForKey: Summary Class method that creates a shared defaults object. Instance method that returns an object for the key; numerous variants return specific types of objects such as strings, Booleans, and the like. Instance method that sets a key to the object; numerous variants set specific types of objects such as strings, Booleans, and so on. Class method that saves any changes made to the shared object.
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setObjectForKey:
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