How to save UIImage to file with NSFileManager?

Question

How I can save UIImage to file with NSFileManager ?

Thank,

score 55 · Accepted Answer · edited May 23 '17 at 12:26

55

Here we go.

This will store a UIImage into your documents directory of your iOS App. You won't need NSFileManager.

NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString * basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;

UIImage * imageToSave = [UIImage imageNamed:@"Icon.png"];
NSData * binaryImageData = UIImagePNGRepresentation(imageToSave);

[binaryImageData writeToFile:[basePath stringByAppendingPathComponent:@"myfile.png"] atomically:YES];

Edit: If you store images form the iOS Camera, you might look at how you can rotate the images to the right orientation. Look here in that case.

edited May 23 '17 at 12:26

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answered Apr 10 '12 at 18:27

Jonas Schnelli

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Thanks but when I load the image it shown me with wrong orientation. – user1234096 Apr 10 '12 at 18:37
@JonasSchnelli ... that's why I suggested NSCoding. – Matisse VerDuyn Apr 10 '12 at 18:42
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@Matisse VerDuyn: okay. one plus. But turning it by "hand" is not that hard. :) – Jonas Schnelli Apr 10 '12 at 18:46
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how do i retrieve the file? – SleepsOnNewspapers May 01 '15 at 19:17
@user1234096 `UIImagePNGRepresentation()` strips `imageOrientation` – pxpgraphics Aug 18 '16 at 22:56

score 1 · Answer 2 · answered Apr 10 '12 at 18:27

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To save it as a file, you'll either need to put it in a plist, or create a png/jpg representation of the image. You can save the UIImage data a little easier with NSCoding.

See this tutorial for more info: http://www.raywenderlich.com/1914/how-to-save-your-app-data-with-nscoding-and-nsfilemanager

answered Apr 10 '12 at 18:27

Matisse VerDuyn

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Hmm... why use NSCoding? Okay: maybe when you try to store complex object structures with UIImages in it. The coding process also eats CPU ticks. – Jonas Schnelli Apr 10 '12 at 18:30

How to save UIImage to file with NSFileManager?

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