ios - Is it ok to use UIPasteboard in a background thread? -

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is uipasteboard thread safe ?

i trying this

dispatch_async(dispatch_get_global_queue(0, 0), ^{      uipasteboard *generalpasteboard = [uipasteboard generalpasteboard];      nsdata *settingsdata = [generalpasteboard dataforpasteboardtype:@"sometype"];      if (settingsdata == nil) {          uipasteboard *pasteboard = [uipasteboard pasteboardwithname:@"somename" create:yes];         settingsdata = [pasteboard dataforpasteboardtype:@"sometype"];     }        // settingsdata });

is safe or should use uipasteboard on main thread ?

i'm using on background thread on ios 9 , 10 no issues. pasteboard accesses global, shared system resources, assume thread safe, though in uikit framework. there no documentation me up, own experience.

example code, using category created mbprogresshud:

typedef void (^imageblock)(uiimage* image); #define dispatch_async_global(code) dispatch_async(dispatch_get_global_queue(0, 0), ^{ code }); #define dispatch_async_main(code) dispatch_async(dispatch_get_main_queue(), ^{ code });  + (void) pasteboardimagewithcompletion:(imageblock)block {     // show hud in main window     mbprogresshud* hud = [mbprogresshud showhudanimated:yes];     dispatch_async_global     ({         uiimage* img = [uipasteboard generalpasteboard].image;         if (img == nil)         {             nsurl* url = [uipasteboard generalpasteboard].url;             if (url == nil)             {                 nsdata* data = [[uipasteboard generalpasteboard] dataforpasteboardtype:(nsstring*)kuttypeimage];                 img = [uiimage imagewithdata:data];             }             else             {                 img = [uiimage imagewithdata:[nsdata datawithcontentsofurl:url]];             }         }         dispatch_async_main         ({             block(img);             [hud hideanimated:yes];         });     }); }

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