What does autoresize = RM+BM mean?

Question

I get this when using the Xcode debugging console with this line:

po [[UIWindow keyWindow] recursiveDescription]

Then I get back lines with the recursive description like this

<UILabel: 0xb0b8170; frame = (138 106; 200 15); text = 'Distance'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0xb0b8220>>

What does "autoresize = RM+BM" and is there a place I can lookup the meaning of the letters? I also saw something like this "autoresize = LM+W+RM+TM+H+BM".

Answer 1

autoresize indicates which bits have been set in the autoresizingMask:

RM = UIAutoresizingFlexibleRightMargin
BM = UIAutoresizingFlexibleBottomMargin

The others follow a similar abbreviation syntax.

Answer 2

If you give all the constraints, then you can easily see all of them. These all indicates the UIAutoResizing.

RM means Right margin

BM means Bottom margin

W means Width

H means Height

LM means Left margin

TM means Top margin

Answer 3

<SIGMAPOINT_MPAdView: 0x10db888a0; frame = (0 0; 320 50); clipsToBounds = YES; autoresize = LM+RM; layer = <CALayer: 0x282b704c0>>