SKScene: find max position of SKSpriteNode
<p>I'm writing an App for iPad and iOS 10.
My App uses only one SKScene (size is 1300 by 1000).
I also use one camera defined like this:</p>

<pre><code>myCamera=[[SKCameraNode alloc] init];
myCamera.position=CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));
self.camera=myCamera;
[self addChild:myCamera];
</code></pre>

<p>I use many SKSpriteNodes that the user can drag around (even beyond the size of the SKScene).</p>

<p>I also use:</p>

<pre><code>[myCamera setScale:newScale];
</code></pre>

<p>to deal with pinch to zoom.</p>

<p>I need to know if there is a way to get the max X position of the node that is most distant from position 0,0 in the SKScene on the right hand side without having to read all node positions one by one.
And then do the same for the other three sides (up, left, down).</p>