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Requesting Focus from Two Focus Environments Simultaneously
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| // animalsViewController.preferredFocusedView => catButton | |
| // animalsViewController.view.preferredFocusedView => pigButton | |
| animalsViewController.setNeedsFocusUpdate() | |
| animalsViewController.view.setNeedsFocusUpdate() | |
| animalsViewController.view.updateFocusIfNeeded() | |
| // UIScreen.mainScreen().focusedView => catButton |
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