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In line 98 and 126 of PullToRefresh.swift, the following warning is generated: Simultaneous accesses to 0x104e18828, but modification requires exclusive access

line 98: if (context == &KVOContext && keyPath == contentOffsetKeyPath && object as? UIScrollView == scrollView) {

line 126: else if (context == &KVOContext && keyPath == contentSizeKeyPath && object

Downloaded Example App and executed it, In iPhone X the back button in the Nav Bar is not Aligned properly and when click on the Back button is not working as it is displaying on the Top, When click on the Bottom it worked. How can it be fixed.

Attaching the Image
![simulator screen shot - iphone x - 2018-03-12 at 13 16 34](https://user-images.githubusercontent.com/7392665/37271203-df2cdb98-

Hello,

I detect error with static table view.

Content of table view cell is under imagen parallax header. It´s correct.

But, description table view cell, is over imagen parallax header. It´s error.

![img_0968](https://user-images.githubusercontent.com/26386809/32767434-b

Navigation bar gets stuck in a half transparent state if the content height is not large enough.