保存数据的一系列方法

保存数据的一系列方法

http://cocoachina.com/bbs/read.php?tid-9414-fpage-0-toread--page-1.html /*======================================================= NSKeyedArchiver ========================================================*/ NSString * str = @"abc" ; NSString * astr = @"efg" ; NSArray * Array = [ NSArray arrayWithObjects : str, astr, nil ] ;   //Save NSString * Path = [ NSSearchPathForDirectoriesInDomains ( NSDocumentDirectory, NSUserDomainMask, YES ) objectAtIndex : 0 ] ; NSString * filename = [ Path stringByAppendingPathComponent : @"test" ] ; [ NSKeyedArchiver archiveRootObject : Array toFile : filename ] ;   str = @"a" ; astr = @"" ;   //load NSArray * arr = [ NSKeyedUnarchiver unarchiveObjectWithFile : filename ] ; str = [ arr objectAtIndex : 0 ] ; astr = [ arr objectAtIndex : 1 ] ;   NSLog ( @"str:%@" ,str) ; NSLog ( @"astr:%@" ,astr) ;       /*======================================================= NSUserDefaults ========================================================*/ NSString * str = @"abc" ; NSString * astr = @"efg" ; NSArray * Array = [ NSArray arrayWithObjects : str, astr, nil ] ;   //Save NSUserDefaults * SaveDefaults = [ NSUserDefaults standardUserDefaults ] ; [ SaveDefaults setObject : Array forKey : @"SaveKey" ] ;   str = @"a" ; astr = @"" ;   //load Array = [ SaveDefaults objectForKey : @"SaveKey" ] ; str = [ Array objectAtIndex : 0 ] ; astr = [ Array objectAtIndex : 1 ] ; NSLog ( @"str:%@" ,str) ; NSLog ( @"astr:%@" ,astr) ;         /*======================================================= writeToFile: ========================================================*/ NSString * str = @"abc" ; NSString * astr = @"efg" ; NSArray * Array = [ NSArray arrayWithObjects : str, astr, nil ] ;   //Save NSArray * paths = NSSearchPathForDirectoriesInDomains ( NSDocumentDirectory, NSUserDomainMask, YES ) ; NSString * documentsDirectory = [ paths objectAtIndex : 0 ] ; if ( ! documentsDirectory) { NSLog ( @"Documents directory not found!" ) ; } NSString * appFile = [ documentsDirectory stringByAppendingPathComponent : @"Savedatas.plist" ] ; [ [ NSArray arrayWithObjects : Array ,nil ] writeToFile : appFile atomically : NO ] ;     //load if ( [ [ NSFileManager defaultManager ] fileExistsAtPath : appFile] ) self .SaveDataArray = [ NSMutableArray arrayWithContentsOfFile : appFile] ; else self .SaveDataArray = [ NSMutableArray arrayWithContentsOfFile : [ [ NSBundle mainBundle ] pathForResource : @"Savedatas" ofType : @"plist" ] ] ; NSArray * strArray = [ self .SaveDataArray objectAtIndex : 0 ] ;   str = [ strArray objectAtIndex : 0 ] ; astr = [ strArray objectAtIndex : 1 ] ;           //坛子里的，搬过来。。。。。 - ( BOOL ) writeApplicationData: ( NSDictionary * ) data writeFileName: ( NSString * ) fileName { NSArray * paths = NSSearchPathForDirectoriesInDomains ( NSDocumentDirectory, NSUserDomainMask, YES ) ; NSString * documentsDirectory = [ paths objectAtIndex : 0 ] ; if ( ! documentsDirectory) { NSLog ( @"Documents directory not found!" ) ; return NO ; } NSString * appFile = [ documentsDirectory stringByAppendingPathComponent : fileName ] ; return ( [ data writeToFile : appFile atomically : YES ] ) ; }   - ( id ) readApplicationData: ( NSString * ) fileName { NSArray * paths = NSSearchPathForDirectoriesInDomains ( NSDocumentDirectory, NSUserDomainMask, YES ) ; NSString * documentsDirectory = [ paths objectAtIndex : 0 ] ; NSString * appFile = [ documentsDirectory stringByAppendingPathComponent : fileName ] ; NSDictionary * myData = [ [ [ NSDictionary alloc ] initWithContentsOfFile : appFile] autorelease ] ; return myData; }