在开发中，我们常常需要得到应用程序沙盒的路径。总结出来。

直接贴代码：

//获得应用程序沙盒的Documents文件夹路径**
NSArray *arrDocumentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *documentPath = [arrDocumentPathsobjectAtIndex:0];
NSLog(@"Documents path: %@",documentPath);

**//获得应用程序沙盒的Caches文件夹路径**
NSArray*arrCachesPaths=NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES);
NSString*CachesPath=[arrCachesPathsobjectAtIndex:0];
NSLog(@"Caches path: %@",CachesPath);

//获得应用程序沙盒的Downloads文件夹路径
NSArray*arrDownloadPaths=NSSearchPathForDirectoriesInDomains(NSDownloadsDirectory,NSUserDomainMask,YES);
NSString*loadPathsPath=[arrDownloadPathsobjectAtIndex:0];
NSLog(@"Downloads path: %@",loadPathsPath);

//获得应用程序沙盒的home文件夹路径**
NSString*homePath=NSHomeDirectory();

//获得应用程序沙盒的tmp文件夹路径**
NSString*TmpPath=NSTemporaryDirectory();

//将文件写入到指定程序沙盒的指定文件夹中**
NSString *fileName =  [homePathstringByAppendingPathComponent:@"myFile"];

NSString *content = @"a";

NSData *contentData = [contentdataUsingEncoding:NSUTF8StringEncoding];

if([contentDatawriteToFile:fileNameatomically:YES]) {
    NSLog(@"写入成功");
}

NSFileManager是一个单列类，也是一个文件管理器。可以通过NSFileManager创建文件夹、创建文件、写文件、读文件内容等等基本功能。

下面将介绍NSFileManager文件操作的十个小功能。我们在Documents里面进行举例，首先是获取Documents的路径。

获取Documents路径方法如下：

- (NSString *)getDocumentsPath
{
  //获取Documents路径
  NSArray *paths =     NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
  NSString *path = [paths objectAtIndex:0];
  NSLog(@"path:%@", path);
  return path;
}

创建文件夹

-(void)createDirectory{
    NSString *documentsPath =[self getDocumentsPath];

    NSFileManager *fileManager = [NSFileManager defaultManager];

    NSString *iOSDirectory = [documentsPath stringByAppendingPathComponent:@"iOS"];

    BOOL isSuccess = [fileManager createDirectoryAtPath:iOSDirectory withIntermediateDirectories:YES attributes:nil error:nil];

    if (isSuccess) {
        NSLog(@"success");
    } else {
        NSLog(@"fail");
    }
}

创建文件

-(void)createFile{
    NSString *documentsPath =[self getDocumentsPath];

    NSFileManager *fileManager = [NSFileManager defaultManager];

    NSString *iOSPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];

    BOOL isSuccess = [fileManager createFileAtPath:iOSPath contents:nil attributes:nil];

    if (isSuccess) {
        NSLog(@"success");
    } else {
        NSLog(@"fail");
    }
}

写文件

-(void)writeFile{
    NSString *documentsPath =[self getDocumentsPath];
    NSString *iOSPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
    NSString *content = @"我要写数据啦";
    BOOL isSuccess = [content writeToFile:iOSPath atomically:YES encoding:NSUTF8StringEncoding error:nil];
    if (isSuccess) {
        NSLog(@"write success");
    } else {
        NSLog(@"write fail");
    }
}

读取文件内容

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

判断文件是否存在

- (BOOL)isSxistAtPath:(NSString *)filePath{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL isExist = [fileManager fileExistsAtPath:filePath];
    return isExist;
}

计算文件大小

- (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;
    }  
}

计算整个文件夹中所有文件大小

- (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;
    }
}

删除文件

-(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");
}
}

移动文件

- (void)moveFileName
{
    NSString *documentsPath =[self getDocumentsPath];

    NSFileManager *fileManager = [NSFileManager defaultManager];

    NSString *filePath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];

    NSString *moveToPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];

    BOOL isSuccess = [fileManager moveItemAtPath:filePath toPath:moveToPath error:nil];

    if (isSuccess) {
        NSLog(@"rename success");
    }else{
        NSLog(@"rename fail");
    }
}

重命名

- (void)renameFileName
{
    //通过移动该文件对文件重命名
    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");
    }
}
```