CODEWITHSUNDEEP
objective-c
Reveclair
Reveclair

Reputation: 2421

Issue with the 'strong' property

I'm trying to learn Objective-C. So I've just implemented a ProfileViewController and here is my header file: 

#import <UIKit/UIKit.h>

@interface ProfileViewController : UIViewController

@property (strong, nonatomic) UIScrollView *scrollView;//strong is not colored by XCode

@end

But I have the following error with the @property line and I'm completely stuck with it :

No 'assign', 'retain' or 'copy' attribute is specified - 'assign' is assumed
Default property 'assign' not appropriate for non-gc object

And in my ProfileViewController.m I have the following warning : Property 'scrollView' needssetScrollView need to be defined

Developer Information:

  Version:  4.1 (4B110)
  Location: /Developer
  Applications:
  Xcode:    4.1 (516)
  Instruments:  4.1 (4138)
  Dashcode: 3.0.2 (336)
  SDKs:
  Mac OS X:
  10,6: (10J567)
  10,7: (11A511a)
  iPhone OS:
  4,3:  (8H7)
  iPhone Simulator:
  4,3:  (8H7)

Upvotes: 0

Views: 519

Answers (2)

utsabiem
utsabiem

Reputation: 920

Are you actually using ARC ? Did you tick-marked the checkbox 'use automatic reference counting' while creating the project ? If you use older version of XCode, then you will not get such options as it does not support ARC. In that case, either update your xcode or continue without ARC using manual memory management and keywords such as 'assign/nonassign' instead of 'strong/weak' ...

Upvotes: 0

Martin R
Martin R

Reputation: 539685

Strong properties are a feature of ARC (automatic reference counting) which is available since Xcode 4.2 (LLVM compiler 3.0), compare https://developer.apple.com/library/ios/releasenotes/ObjectiveC/ObjCAvailabilityIndex/index.html.

Upvotes: 7

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