问题
I am building a tvos app and i want the UITextView to behave similarly like in tvos Movies app. I am specially interested in the focused appearence. Please have a look ate these two pictures.
Currently i am just adding background color to the textview when it is focused but how i can achieve this focused appearance in the attached images. here is my small code
override func didUpdateFocusInContext(context: UIFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {
super.didUpdateFocusInContext(context, withAnimationCoordinator: coordinator)
if context.previouslyFocusedView == lessonDescriptionTxt {
coordinator.addCoordinatedAnimations({ () -> Void in
self.lessonDescriptionTxt.layer.backgroundColor = UIColor.clearColor().CGColor
}, completion: nil)
}
if context.nextFocusedView == lessonDescriptionTxt {
coordinator.addCoordinatedAnimations({ () -> Void in
self.lessonDescriptionTxt.layer.backgroundColor = UIColor.blackColor().colorWithAlphaComponent(0.2).CGColor
}, completion: nil)
}
}
Also if someone can suggest how i can achieve this MORE feature in the textView when there is more text. I also read this question Make UILabel focusable and tappable (tvOS) but that does not do the job for me.
回答1:
The "MORE" text appears only when the description can't fit in the space that's available. You should be able to measure the amount of space needed by text by using UIKit's -[NSAttributedString boundingRectWithSize:options:context:] method.
来源：https://stackoverflow.com/questions/34158882/tvos-uitextview-focus-appearance-like-movies-app