NSFileManager是個(gè)單例類镜沽，也是一個(gè)文件管理器敏晤。可以通過NSFileManager創(chuàng)建文件夾缅茉、創(chuàng)建文件嘴脾、寫文件、讀文件內(nèi)容等等基本功能蔬墩。

我們?cè)贒ocuments里面進(jìn)行舉例译打，首先是獲取Documents的路徑。

 //獲取Documents路徑
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *path = [paths objectAtIndex:0];
    NSLog(@"path:%@", path);

創(chuàng)建文件夾

    NSArray *documentArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentPath = [documentArray firstObject];
    NSLog(@"documentPath = %@",documentPath);
    
    NSString *filePath = [documentPath stringByAppendingPathComponent:@"ios"];
    
   BOOL isSuccess =  [[NSFileManager defaultManager] createDirectoryAtPath:filePath withIntermediateDirectories:YES attributes:nil error:nil];
    NSLog(@"%d",isSuccess);

創(chuàng)建文件

    NSArray *documentArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentPath = [documentArray firstObject];
    NSLog(@"documentPath = %@",documentPath);
    
    NSString *filePath = [documentPath stringByAppendingPathComponent:@"ios.txt"];
    
    [[NSFileManager defaultManager] createFileAtPath:filePath contents:nil attributes:nil];

寫文件

    NSString *documentsPath =[self getDocumentsPath];
    NSString *iOSPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
    NSString *content = @"我要寫數(shù)據(jù)啦";
    BOOL isSuccess = [content writeToFile:iOSPath atomically:YES encoding:NSUTF8StringEncoding error:nil];

讀取文件內(nèi)容

    NSString *documentsPath =[self getDocumentsPath];
    NSString *iOSPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
    NSString *content = [NSString stringWithContentsOfFile:iOSPath encoding:NSUTF8StringEncoding error:nil];
    NSLog(@"read success: %@",content);

判斷文件是否存在

NSString *filePath = [documentPath stringByAppendingPathComponent:@"ios.txt"];
    
   BOOL isExist = [[NSFileManager defaultManager] fileExistsAtPath:filePath];

計(jì)算文件大小

- (unsigned long long)fileSizeAtPath:(NSString *)filePath{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL isExist = [fileManager fileExistsAtPath:filePath];
    if (isExist){
        unsigned long long fileSize = [[fileManager attributesOfItemAtPath:filePath error:nil] fileSize];
        return fileSize;
    } else {
        NSLog(@"file is not exist");
        return 0;
    }
}

計(jì)算整個(gè)文件夾中所有文件大小

- (unsigned long long)folderSizeAtPath:(NSString*)folderPath{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL isExist = [fileManager fileExistsAtPath:folderPath];
    if (isExist){
        NSEnumerator *childFileEnumerator = [[fileManager subpathsAtPath:folderPath] objectEnumerator];
        unsigned long long folderSize = 0;
        NSString *fileName = @"";
        while ((fileName = [childFileEnumerator nextObject]) != nil){
            NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
            folderSize += [self fileSizeAtPath:fileAbsolutePath];
        }
        return folderSize / (1024.0 * 1024.0);
    } else {
        NSLog(@"file is not exist");
        return 0;
    }
}

刪除文件

-(void)deleteFile{
    NSString *documentsPath =[self getDocumentsPath];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSString *iOSPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
    BOOL isSuccess = [fileManager removeItemAtPath:iOSPath error:nil];
    if (isSuccess) {
        NSLog(@"delete success");
    }else{
        NSLog(@"delete fail");
    }
}

移動(dòng)文件

- (void)moveFileName
{
    NSString *documentsPath =[self getDocumentsPath];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSString *filePath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
    NSString *moveToPath = [documentsPath stringByAppendingPathComponent:@"ios/qq"];
    BOOL isSuccess = [fileManager moveItemAtPath:filePath toPath:moveToPath error:nil];
    if (isSuccess) {
        NSLog(@"rename success");
    }else{
        NSLog(@"rename fail");
    }
}

重命名

- (void)renameFileName
{
    //通過移動(dòng)該文件對(duì)文件重命名
    NSString *documentsPath =[self getDocumentsPath];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSString *filePath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
    NSString *moveToPath = [documentsPath stringByAppendingPathComponent:@"rename.txt"];
    BOOL isSuccess = [fileManager moveItemAtPath:filePath toPath:moveToPath error:nil];
    if (isSuccess) {
        NSLog(@"rename success");
    }else{
        NSLog(@"rename fail");
    }
}