loosing string property after setting base64encoded string

Asked Apr 12 '18 at 10:46

Active Apr 12 '18 at 10:46

Viewed 28 times

I have an object of class A which has a property of NSString. I am setting this property with a Base64 encoded String. Once I set another property, the first property changes to nil

How can that be?

Here is my code: A.h

@property (nonatomic, retain) NSString* b64ImageData;

Here I am setting it:

[imageInfo setB64ImageData:string64encoded];
[imageInfo setName:last];

Note that the imageInfo class resides in a library using Manual Reference Counting, while the code resides in a project with Automatic Reference Counting.

See screenshot of debugger before setting other property:

See screenshot after setting other property:

Any help appreciated, thanks!

asked Apr 12 '18 at 10:46

mrd

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An `NSString` property is supposed to be declared as `copy` rather than `retain`. – vadian Apr 12 '18 at 10:54
changed it to ` copy` but same effect. :-( – mrd Apr 12 '18 at 11:11
Is `name` just a property or is `setName` implemented? – Willeke Apr 12 '18 at 11:40
found the error and fixed it. Had nothing todo with my code but with the library. Thanks for help. – mrd Apr 12 '18 at 11:49
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@vadian, there is nothing wrong with `retain` `NSString` property. – Cy-4AH Apr 12 '18 at 12:51
@Cy-4AH No, it's not wrong, but the semantics of classes based on constants like `NSString` and `NSNumber` are to copy the value rather than to retain it. – vadian Apr 12 '18 at 12:54
@vadian why copy `NSNumber`? You can't mutate it. – Cy-4AH Apr 12 '18 at 12:59
Please see https://stackoverflow.com/questions/387959/nsstring-property-copy-or-retain/388002#388002 – vadian Apr 12 '18 at 13:07

loosing string property after setting base64encoded string

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