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Property Lists and Archiving
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hard-code a path in your code to either folder When using the Documents folder, you should use the NSHomeDirectory method combined with the NSSearchPathForDirectoriesInDomain method When obtaining the tmp directory, you should use the NSTemporaryDirectory method
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NSHomeDirectory
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The NSHomeDirectory is how you should obtain an application s root directory
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NSString * NSHomeDirectory (void);
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Obtain the path to your Documents directory using the NSHomeDirectory By itself, this method isn t very useful, as you usually want to obtain the Documents directory
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NSSearchPathForDirectoriesInDomains
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Obtain the path to your application s Documents directory using the NSSearchPathFor DirectoriesInDomains
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NSArray * NSSearchPathForDirectoriesInDomains ( NSSearchPathDirectory directory, NSSearchPathDomainMask domainMask, BOOL expandTilde );
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The method takes three parameters: the directory to begin the search, the search path domain mask, and a flag indicating if tildes should be converted to actual paths The method returns an array of paths Although on a desktop or laptop there might be multiple elements in the array, on an iOS device, there will only be one result in the array The following code illustrates how to obtain an application s Documents directory on an iOS device:
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NSArray * myPaths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES); NSString * myDocPath = [myPaths objectAtIndex:0];
Values you might use for the directory parameter on an iOS device include NSDocumentDirectory, NSApplicationDirectory, NSCachesDirectory, and NSApplicationSupportDirectory
NSTemporaryDirectory
The NSTemporaryDirectory method returns the path to your application s tmp directory
NSString * NSTemporaryDirectory (void);
Unlike the NSHomeDirectory method, the NSTemporaryDirectory method is useful by itself, as it is the most direct way to obtain a path to your application s tmp directory
Property Lists
The easiest way to save your application s preferences if you re managing them within your application is using a property list If an object can be serialized, you can persist it to a file using a path or URL You can also reconstitute the object by reading it from the file
iOS SDK Programming: A Beginner s Guide
It is worth noting that only objects can be serialized A common source of frustration is trying to serialize a primitive int Since primitive data types are not serializable, they need to be converted to NSObjects (eg, int to NSNumber)
Simple Serialization
The NSDictionary, NSArray, NSString, NSNumber, and NSData classes, and their mutable equivalents, can all be saved as a property list using the writeToFile: or writeToURL: method
-(BOOL)writeToFile:(NSString *) path atomically:(BOOL)flag -(BOOL)writeToURL:(NSURL *) aURL atomically:(BOOL)flag
The first parameter is the path, or URL, to save the file as The second parameter is a flag indicating if the file should first be saved to an auxiliary file If the flag is YES, the data is written to an auxiliary file that is then renamed to the file indicated by the path or URL Writing to an auxiliary file prevents the file system from becoming corrupt should writing the file fail midstream
NOTE
You can refer to the NSDictionary, NSArray, NSString, NSNumber, or NSData classes, or one of their mutable equivalents, as a property list object So you could say the property list objects all contain rather than naming each property list object individually
Reading a property list back into the object uses the initWithContentsOfFile: or initWithContentsOfURL: method
-(id)initWithContentsOfFile:(NSString *)path -(id)initWithContentsOfURL:(NSURL *)aURL
The initWithContentsOfFile: method takes a path to the property file, while the initWithContentsOfURL: takes a URL Both return an id
Try This
Preserving an NSArray
1 Create a new View-based Application named SimpleArray 2 Open SimpleArrayAppDelegatem and modify applicationDidFinishLaunching
WithOptions to match Listing 15-1
3 Click Run (Listing 15-2) 4 After running the application, navigate to propertiesplist in the file system and open it
using TextEdit (Listing 15-3)
15:
Property Lists and Archiving
Listing 15-1 The applicationDidFinishLaunching method in SimpleArrayAppDelegatem
(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { NSMutableArray * dataArray = [[NSMutableArray alloc] initWithObjects: @"First", @"Second", @"Third", nil]; NSString * path = [(NSString *) [NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"propertiesplist"]; [dataArray writeToFile:path atomically:YES]; NSArray * dataArray2 = [[NSArray alloc] initWithContentsOfFile:path]; NSLog(@"objects: %@, %@, %@", [dataArray2 objectAtIndex:0], [dataArray2 objectAtIndex:1], [dataArray2 objectAtIndex:2]); [window addSubview:viewControllerview]; [window makeKeyAndVisible]; [dataArray release]; [dataArray2 release]; }
Listing 15-2
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