Block implicitly retains 'self'; explicitly mention 'self' to indicate this is intended behavior

Question

Given the following:

- (void) someMethod
{
    dispatch_async(dispatch_get_main_queue(), ^{
        myTimer = [NSTimer scheduledTimerWithTimeInterval: 60
            


        

Answer 1

This fixes my problem for Xcode 9.3

- (void) someMethod{

    __weak MyClass *wSelf = self;

    dispatch_async(dispatch_get_main_queue(), ^{

    MyClass *sSelf = wSelf;
    if(sSelf != nil){
        wself.myTimer = [NSTimer scheduledTimerWithTimeInterval: 60
                                                       target: self
                                                     selector:@selector(doSomething)
                                                     userInfo: nil
                                                      repeats: NO];
       }

   });
}