iOS开发之-Property List

Listing 1-2  Reading in and converting the XML property list
- (id) init {
 
    self = [super init];
    if (self) {
        NSString *errorDesc = nil;
        NSPropertyListFormat format;
        NSString *plistPath;
        NSString *rootPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
           NSUserDomainMask, YES) objectAtIndex:0];
        plistPath = [rootPath stringByAppendingPathComponent:@"Data.plist"];
        if (![[NSFileManager defaultManager] fileExistsAtPath:plistPath]) {
            plistPath = [[NSBundle mainBundle] pathForResource:@"Data" ofType:@"plist"];
        }
        NSData *plistXML = [[NSFileManager defaultManager] contentsAtPath:plistPath];
        NSDictionary *temp = (NSDictionary *)[NSPropertyListSerialization
            propertyListFromData:plistXML
            mutabilityOption:NSPropertyListMutableContainersAndLeaves
            format:&format
            errorDescription:&errorDesc];
        if (!temp) {
            NSLog(@"Error reading plist: %@, format: %d", errorDesc, format);
        }
        self.personName = [temp objectForKey:@"Name"];
        self.phoneNumbers = [NSMutableArray arrayWithArray:[temp objectForKey:@"Phones"]];
 
    }
    return self;
}

Listing 1-3  Converting and writing the property list to the application bundle
- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender {
    NSString *error;
    NSString *rootPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *plistPath = [rootPath stringByAppendingPathComponent:@"Data.plist"];
    NSDictionary *plistDict = [NSDictionary dictionaryWithObjects:
            [NSArray arrayWithObjects: personName, phoneNumbers, nil]
            forKeys:[NSArray arrayWithObjects: @"Name", @"Phones", nil]];
    NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:plistDict
                            format:NSPropertyListXMLFormat_v1_0
                            errorDescription:&error];
    if(plistData) {
        [plistData writeToFile:plistPath atomically:YES];
    }
    else {
        NSLog(error);
        [error release];
    }
    return NSTerminateNow;
}

By convention, each Cocoa and Core Foundation object listed in Table 2-1 is called a property-list object.