iOS对于目录的操作

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 = [[NSFileManager alloc]init];

[fileManager createDirectoryAtPath:documentsDirectory withIntermediateDirectories: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 = [documentsDirectory stringByAppendingPathComponent: fileName];

[filemanager removeItemAtPath: filePath error:NULL];