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How do we create a temporary file in iOS

Tarun Kumar 2835 05-Sep-2015

In C# we could easily create a temporary file and get its name using this function:

Path.GetTempFileName();

 

This function would create a file with a unique name in the temporary directory and return the full path to that file.

In the Cocoa API's, the closest thing we find is: NSTemporaryDirectory

We are missing something obvious or is there no built in way to do this?

iphone iphone  ios  objective c 
Updated on 07-Sep-2015
Tarun Kumar

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Anonymous User

Anonymous User

07-Sep-2015

I created a pure Cocoa solution by way of a category on NSFileManager that uses a combination of NSTemporary() and a globally unique ID. 

Here the header file: 

@interface NSFileManager (TemporaryDirectory) 
    -(NSString *) createTemporaryDirectory;  
@end

 

And the implementation file:

@implementation NSFileManager (TemporaryDirectory)
-(NSString *) createTemporaryDirectory {
    // Create a unique directory in the system temporary directory
    NSString *guid = [[NSProcessInfo processInfo] globallyUniqueString];
    NSString *path = [NSTemporaryDirectory() stringByAppendingPathComponent:guid];
    if (![self createDirectoryAtPath:path withIntermediateDirectories:NO attributes:nil error:nil]) {
            return nil;
    }
    return path;
} 
@end

This creates a temporary directory but could be easily adapted to use createFileAtPath:contents:attributes: instead of createDirectoryAtPath: to create a file instead.

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