Question

i get many warnings of type:

‘__strong’ only applies to objective-c object or block pointer types; type here is…

the warnings are pointing to framework headers. e.g NSNotification, NSURL, NSIndexset etc..

what are they and how can i repair it?

note 1: i use ARC

note 2: the app seems to work

edit 1: the warnings seems to originate from my pch file. which is:

//
// Prefix header for all source files of the 'myapp' target in the 'myapp' project
//

#import <Availability.h>

#ifndef __IPHONE_5_0
     #warning "This project uses features only available in iOS SDK 5.0 and later."
#endif

#ifdef __OBJC__
    #import <UIKit/UIKit.h>
    #import <Foundation/Foundation.h>
#endif

edit 2:
example of warning:
warning in NSString.h point to:

/* Methods to convert NSString to a NULL-terminated cString using the specified encoding.     Note, these are the "new" cString methods, and are not deprecated like the older cString     methods which do not take encoding arguments.
*/
- (__strong const char *)cStringUsingEncoding:(NSStringEncoding)encoding; //"Autoreleased"; NULL return if encoding conversion not possible; for performance reasons, lifetime of this should not be considered longer than the lifetime of the receiving string (if the receiver string is freed, this might go invalid then, before the end of the autorelease scope)

Answer 1

it seems i’ve solved it.
for some reason i had a “Framework” folder with headers in my project local folder. removing that folder and the warnings are gone. i don’t know how and why that folder was created. (i did not created it).