gistfile1.txt

- (void)viewDidLayoutSubviews
{
  [super viewDidLayoutSubviews];
	
	CGFloat topInset = 0;
	CGFloat bottomInset = 0;
	
	if ([self respondsToSelector:NSSelectorFromString(@"topLayoutGuide")])
	{
		id topLayoutGuide = [self valueForKeyPath:@"topLayoutGuide"];
		topInset = (CGFloat)[topLayoutGuide length]; // 97
	}

  topInset = [self.topLayoutGuide length];  // 64
}

Since topLayoutGuide is typed as id, the return type of the length message is guessed to be NSUInteger and the message is sent with the wrong ABI calling convention.

Try using your topLayoutGuide object actual class instead of casting the result to CGFloat, i.e.

LayoutGuide *topLayoutGuide = [self valueForKeyPath:@"topLayoutGuide"];
topInset = [topLayoutGuide length];