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;
}