iOS 文件目录操作

iOS可操作目录有两种：Documents下与Caches下， 如图：

1、创建目录 createDirectoryAtPath: withIntermediateDirectories:attributes:error:

NSFileManager * fileManager =nil;

NSArray *paths = nil;

NSString *documentsDirectory =nil;

NSString * folerName =@"Photos";

NSString * fileName= @"myphoto.png";

NSString  * filePath =nil;

UIImage *photoimage = nil;

NSData * imageData= nil;

//Documents:

 

paths= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

//Caches:

 

paths =NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);

documentsDirectory = [[paths objectAtIndex:0] stringByAppendingPathComponent:folerName];

fileManager = [[NSFileManageralloc]init];

[fileManagercreateDirectoryAtPath:documentsDirectorywithIntermediateDirectories:YESattributes:nil error:error];

 

2、创建目录并在目录中存储对象createFileAtPath: contents: attributes

 

filePath =[documentsDirectory stringByAppendingPathComponent:filename];

 

if((![fileManager fileExistsAtPath:fullPathToFile])) 

     {

photoimage =[[UIImage alloc] imageNamed:@"photo.png"];

imageData =UIImagePNGRepresentation(photoimage);

[fileManager createFileAtPath:filePath contents: imageData attributes:nil];

    }

[ photoimage release];

 

[fileManager release];

3、删除目录中指定文件

 

NSString * filePath= [documentsDirectorystringByAppendingPathComponent: fileName];

[filemanagerremoveItemAtPath: filePath error:NULL];