转----iPhone 对Plist文件进行读写

读Plist文件
　　NSString *errorDesc = nil;
　　NSPropertyListFormat format;
　　NSString *rootPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
　　NSString *plistPath = [rootPath stringByAppendingPathComponent:@"bookmarks.plist"];
　　if (![[NSFileManager defaultManager] fileExistsAtPath:plistPath]) {
　　plistPath = [[NSBundle mainBundle] pathForResource:@"bookmarks" ofType:@"plist"];
　　}
　　NSData *plistXML = [[NSFileManager defaultManager] contentsAtPath:plistPath];
　　context.bookmarksDic = (NSMutableDictionary *)[[NSPropertyListSerialization propertyListFromData:plistXML mutabilityOption:NSPropertyListMutableContainersAndLeaves
　　format:&format
　　errorDescription:&errorDesc] retain];
　　keysArr = [[[context.bookmarksDic allKeys] sortedArrayUsingSelector:@selector(compare:)] retain];
　　if (!context.bookmarksDic) {
　　NSLog(@"Error reading plist: %@, format: %d", errorDesc, format);
　　}
　　写入Plist
　　Context *context = [Context getInstance];
　　NSString *rootPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
　　NSUserDomainMask, YES) objectAtIndex:0];
　　NSString *plistPath = [rootPath stringByAppendingPathComponent:@"bookmarks.plist"];
　　NSString *error;
　　NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:context.bookmarksDic
　　format:NSPropertyListXMLFormat_v1_0
　　errorDescription:&error];
　　if(plistData) {
　　[plistData writeToFile:plistPath atomically:YES];
　　}
　　else {
　　NSLog(@"%@",error);
　　[error release];
　　}