iphone 寫檔和讀檔

前輩說，程式命名做的好就不用寫註解，所以nothing to say

-(void)writeToTextFile:(NSString*)content withFileName:(NSString*)textFileName

{

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    

    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *fileName = [NSString stringWithFormat:@"%@/%@",documentsDirectory,textFileName];

    

    //save context to file

    [content writeToFile:fileName atomically:NO encoding:NSStringEncodingConversionAllowLossy error:nil];

}

-(void)readTextFile:(NSString *)textFileName

{

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    

    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *fullFileName = [NSString stringWithFormat:@"%@/%@",documentsDirectory,textFileName];

    

    NSString *content = [[NSString alloc] initWithContentsOfFile:fullFileName usedEncoding:nil error:nil];

    NSLog(@"%@",content);

    [content release];

}

- (void)viewDidLoad

{

    [super viewDidLoad];

    NSString *testContent = @"test to write file text!!";

    [self writeToTextFile:testContent withFileName:@"textfile.txt"];

    [self readTextFile:@"textfile.txt"];

    

}