iOS 关于文件操作 NSFileManager

+ (BOOL)creatDir:(NSString *)path {
    if (path.length==0) {
        return NO;
    }
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL isSuccess = YES;
    BOOL isExist = [fileManager fileExistsAtPath:path];
    if (isExist==NO) {
        NSError *error;
        if (![fileManager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:&error]) {
            isSuccess = NO;
            NSLog(@"creat Directory Failed:%@",[error localizedDescription]);
        }
    }
    return isSuccess;
}

+ (BOOL)creatFile:(NSString*)filePath {
    if (filePath.length==0) {
        return NO;
    }
    NSFileManager *fileManager = [NSFileManager defaultManager];
    if ([fileManager fileExistsAtPath:filePath]) {
        return YES;
    }
    NSError *error;
    NSString *dirPath = [filePath stringByDeletingLastPathComponent];
    BOOL isSuccess = [fileManager createDirectoryAtPath:dirPath withIntermediateDirectories:YES attributes:nil error:&error];
    if (error) {
        NSLog(@"creat File Failed:%@",[error localizedDescription]);
    }
    if (!isSuccess) {
        return isSuccess;
    }
    isSuccess = [fileManager createFileAtPath:filePath contents:nil attributes:nil];
    return isSuccess;
}

+ (BOOL)writeToFile:(NSString*)filePath contents:(NSData *)data {
    if (filePath.length==0) {
        return NO;
    }
    BOOL result = [self creatFile:filePath];
    if (result) {
        if ([data writeToFile:filePath atomically:YES]) {
            NSLog(@"write Success");
        }else{
            NSLog(@"write Failed");
        }
    }
    else{
        NSLog(@"write Failed");
    }
    return result;
}

+ (BOOL)appendData:(NSData*)data withPath:(NSString *)filePath {
    if (filePath.length==0) {
        return NO;
    }
    BOOL result = [self creatFile:filePath];
    if (result) {
        NSFileHandle *handle = [NSFileHandle fileHandleForWritingAtPath:filePath];
        [handle seekToEndOfFile];
        [handle writeData:data];
        [handle synchronizeFile];
        [handle closeFile];
    }
    else{
        NSLog(@"appendData Failed");
    }
    return result;
}