问题
I've been trying to use the appearance proxy API to apply some default colors to some controls, but I've run into a problem.
When I apply a tint color to UISegmentedControl using something like...
UISegmentedControl.appearance().tintColor = UIColor.red
It generates this...
All good, but when I add...
UIImageView.appearance().tintColor = UIColor.green
it changes to...
Just to be clear, I have BOTH this lines in my code
UISegmentedControl.appearance().tintColor = UIColor.red
UIImageView.appearance().tintColor = UIColor.green
It doesn't matter in what order I call them, the result is the same, the UIImageView properties override the UISegmentedControls
I've spent over half a day trying to find a solution to this problem but can't seem to find anything that works.
Running Xcode 8.2, iOS 10, Swift 3
What am I doing wrong and how can I fix?
回答1:
I am not sure about this, but I guess, UISegmentedControl uses UIImageView to create segments, i.e. the segments we see inside segmented control are UIImageViews and not UIViews. UISegmentedControl even has methods to setImage for a particular segment.
If above is true, we can use appearanceWhenContainedIn API of UIAppearance to set image view tint colour like this:
UIImageView.appearance(whenContainedInInstancesOf: [UISegmentedControl.self]).tintColor = UIColor.red
UIImageView.appearance().tintColor = UIColor.green
来源：https://stackoverflow.com/questions/42062659/uiimageview-appearance-is-overriding-uisegmentedcontrol-appearance