ios - How do I solve this Automatic Reference Counting (ARC) conflict? -

i have uiviewcontroller requires facebook login button present in screen. now, facebook ios button requires arc off.

on other hand, in same uiviewcontroller using nstimer show few photos slideshow @ background - feature requires arc setting.

so, have single file requires arc 1 of components, while not other.

the exact problem in code:

-(void)handletimer {      [uiview transitionwithview:imageview duration:3 options:(uiviewanimationoptiontransitioncrossdissolve | uiviewanimationoptioncurveeaseinout) animations:^{         imageview.image = [uiimage imagenamed:[myimages objectatindex:imageptr]];     } completion:nil];      if(imageptr == (myimages.count) - 1)         imageptr = 0;     else         imageptr = imageptr + 1; } 

if disable arc file has code, throws error @ line:

imageview.image = [uiimage imagenamed:[myimages objectatindex:imageptr]]; 

the error reads:

thread 1 : exc_bad_access (code=exc_i386_gpflt) 

actually, have time see above, continuously update image in imageview.

myimageview of type

@property (nonatomic, assign) iboutlet uiimageview *imageview; 

so, problem here?

here how myimages initialized in viewdidload() method:

@interface viewcontroller () {     uiimage *nextimage;     nsarray *myimages;     int imageptr; } @end  @implementation viewcontroller @synthesize imageview;  - (void)viewdidload {     [super viewdidload];     myimages = @[@"image1.jpg", @"image2.jpg", @"image3.jpg", @"image4.jpg", @"image5.jpg", @"image6.jpg", @"image7.jpg", @"image8.jpg", @"image9.jpg",                  @"image10.jpg", @"image11.jpg", @"image12.jpg", @"image13.jpg",                  @"image14.jpg", @"image15.jpg", @"image16.jpg", @"image17.jpg",                  @"image18.jpg", @"image19.jpg", ];     imageptr = 0;      nstimer *timer;      imageview.image = [uiimage imagenamed:[myimages objectatindex:imageptr]];     imageptr = imageptr + 1;      //imageview.image = [uiimage imagenamed:[myimages objectatindex:imageptr]];      timer = [nstimer scheduledtimerwithtimeinterval: 3                                              target: self                                            selector: @selector(handletimer)                                            userinfo: nil                                             repeats: yes];      // additional setup after loading view, typically nib. } 

your controller compiled under mrc. means ivars doesn't retain values assign them, example:

myimages = @[...]; 

will assign pointer array released anyway , when try access myimages later, application crash.

solutions:

1. mrc - retain
   when assigning ivars, retain value explicitly (myimages = [@[...] retain];), don't forget release in -dealloc.

2. mrc - properties
   remove ivars , declare them properties

   @property (nonatomic, retain) nsarray *myimages;
     
   ... self.myimages = @[...];

   
   again, don't forget release array in -dealloc

3. arc (the preferred solution) - compile controller arc , values in ivars implicitly __strong , retained you.