iOS文件操作的十个小功能

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。这个在iOS开发之沙盒机制（SandBox)已经详细讲解过了。获取Documents路径方法如下：

-(NSString*)getDocumentsPath

{

//获取Documents路径

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

NSString*path=[pathsobjectAtIndex:0];

NSLog(@"path:%@",path);

returnpath;

}

创建文件夹

-(void)createDirectory{

NSString*documentsPath=[selfgetDocumentsPath];

NSFileManager*fileManager=[NSFileManagerdefaultManager];

NSString*iOSDirectory=[documentsPathstringByAppendingPathComponent:@"iOS"];

BOOLisSuccess=[fileManagercreateDirectoryAtPath:iOSDirectorywithIntermediateDirectories:YESattributes:nilerror:nil];

if(isSuccess){

NSLog(@"success");

}else{

NSLog(@"fail");

}

}

创建文件

-(void)createFile{

NSString*documentsPath=[selfgetDocumentsPath];

NSFileManager*fileManager=[NSFileManagerdefaultManager];

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

BOOLisSuccess=[fileManagercreateFileAtPath:iOSPathcontents:nilattributes:nil];

if(isSuccess){

NSLog(@"success");

}else{

NSLog(@"fail");

}

}

写文件

-(void)writeFile{

NSString*documentsPath=[selfgetDocumentsPath];

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

NSString*content=@"我要写数据啦";

BOOLisSuccess=[contentwriteToFile:iOSPathatomically:YESencoding:NSUTF8StringEncodingerror:nil];

if(isSuccess){

NSLog(@"writesuccess");

}else{

NSLog(@"writefail");

}

}

读取文件内容

-(void)readFileContent{

NSString*documentsPath=[selfgetDocumentsPath];

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

NSString*content=[NSStringstringWithContentsOfFile:iOSPathencoding:NSUTF8StringEncodingerror:nil];

NSLog(@"readsuccess:%@",content);

}

判断文件是否存在

-(BOOL)isSxistAtPath:(NSString*)filePath{

NSFileManager*fileManager=[NSFileManagerdefaultManager];

BOOLisExist=[fileManagerfileExistsAtPath:filePath];

returnisExist;

}

计算文件大小

-(unsignedlonglong)fileSizeAtPath:(NSString*)filePath{

NSFileManager*fileManager=[NSFileManagerdefaultManager];

BOOLisExist=[fileManagerfileExistsAtPath:filePath];

if(isExist){

unsignedlonglongfileSize=[[fileManagerattributesOfItemAtPath:filePatherror:nil]fileSize];

returnfileSize;

}else{

NSLog(@"fileisnotexist");

return0;

}

}

计算整个文件夹中所有文件大小

-(unsignedlonglong)folderSizeAtPath:(NSString*)folderPath{

NSFileManager*fileManager=[NSFileManagerdefaultManager];

BOOLisExist=[fileManagerfileExistsAtPath:folderPath];

if(isExist){

NSEnumerator*childFileEnumerator=[[fileManagersubpathsAtPath:folderPath]objectEnumerator];

unsignedlonglongfolderSize=0;

NSString*fileName=@"";

while((fileName=[childFileEnumeratornextObject])!=nil){

NSString*fileAbsolutePath=[folderPathstringByAppendingPathComponent:fileName];

folderSize+=[selffileSizeAtPath:fileAbsolutePath];

}

returnfolderSize/(1024.0*1024.0);

}else{

NSLog(@"fileisnotexist");

return0;

}

}

删除文件

-(void)deleteFile{

NSString*documentsPath=[selfgetDocumentsPath];

NSFileManager*fileManager=[NSFileManagerdefaultManager];

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

BOOLisSuccess=[fileManagerremoveItemAtPath:iOSPatherror:nil];

if(isSuccess){

NSLog(@"deletesuccess");

}else{

NSLog(@"deletefail");

}

}

移动文件

-(void)moveFileName

{

NSString*documentsPath=[selfgetDocumentsPath];

NSFileManager*fileManager=[NSFileManagerdefaultManager];

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

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

BOOLisSuccess=[fileManagermoveItemAtPath:filePathtoPath:moveToPatherror:nil];

if(isSuccess){

NSLog(@"renamesuccess");

}else{

NSLog(@"renamefail");

}

}

重命名

-(void)renameFileName

{

//通过移动该文件对文件重命名

NSString*documentsPath=[selfgetDocumentsPath];

NSFileManager*fileManager=[NSFileManagerdefaultManager];

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

NSString*moveToPath=[documentsPathstringByAppendingPathComponent:@"rename.txt"];

BOOLisSuccess=[fileManagermoveItemAtPath:filePathtoPath:moveToPatherror:nil];

if(isSuccess){

NSLog(@"renamesuccess");

}else{

NSLog(@"renamefail");

}

}