Getting Frame from Nested UIView

Question

I have a UIButton that is nested within 2 UIStackViews that are nested within a UIView.

I give it constraints, however, when I

print(helloButton.frame)

the CGRect output has different values than what appears on the screen.

Notably the coordinates are off.

Is there a reason for this? How do I accurately get the UIButton frame?

Do you get a warning on your layout about being unable to satisfy constraints? — Ares, Dec 15 '15 at 01:21
@Ares I added a picture, check it out. It is easily reproducible — Eric Johnson, Dec 15 '15 at 01:33
@Ares `viewDidAppear`. I also tried with another `UIButton`. same thing — Eric Johnson, Dec 15 '15 at 01:36
See the Yellow Right Arrow right next to "View Controller Scene"? If you click it it will show a list of warnings about your layout. — Ares, Dec 15 '15 at 01:37
What coordinates are you expecting? What makes you think they're "off"? — beyowulf, Dec 15 '15 at 01:52
@Ares the answer is this: http://stackoverflow.com/questions/8082493/how-to-get-the-frame-of-a-view-inside-another-view — Eric Johnson, Dec 15 '15 at 01:53

score 0 · Answer 1 · answered Dec 15 '15 at 03:01

0

Answering my question. The coordinate origin of a UIView.frame CGRect at any time is based on the origin of its containing UIView, not that of the application's view.

To obtain its coordinates based on the origin of the application (absolute top-left corner) I did this:

In Swift:

let absoluteFrame = myView.convertRect(myView.frame, toView: nil)

answered Dec 15 '15 at 03:01

Eric Johnson

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You also should make this conversion in `viewDidLayoutSubviews`, not in `viewDidAppear` (layout may not have finished in `viewDidAppear`) – Aaron Brager Dec 15 '15 at 03:08

Getting Frame from Nested UIView

1 Answers1