Where is rcl_center?

[reactivecocoa]

Where is rcl_center?

[joshaber]

Yep, that should probably exist.

[jspahrsummers]

I don't think so. Setting center is notoriously error-prone. There are two specific problems with it in RCL:

1. It's really easy for views to end up on half pixels. rcl_bounds and rcl_frame perform automatic alignment of the rectangles they're set to, but it's more difficult to align the center point. If you try to align the center by using the view's entire frame, what happens if the size is modified later in the same run loop iteration? It's just tricky.
2. RCL very much favors building up a complete frame and setting that in one fell swoop, because weird behaviors can result if different pieces of the frame are set separately.

It's a better idea to just -alignCenter: the desired bounds, so that you have a signal which represents the total layout of the view.

[zakdances]

Isn't the center property of a UIView derived from frame, not from bounds? Will -alignCenter: used on rcl_frame get the desired result even if a transform has been applied to the view (or it's layer)?

If true, then this should work fine.

[zakdances]

So I'm trying this out with code such as

RACSignal *superBoundsMidWidth = self.view.rcl_boundsSignal.centerX;
RACSignal *superBoundsMidHeight = self.view.rcl_boundsSignal.centerY;

RAC(videoPlayer.rcl_frame) = [videoPlayer.rcl_frameSignal alignCenter:[RACSignal pointsWithX:superBoundsMidWidth Y:superBoundsMidHeight]];

and it appears to be working for now. Closing.