Appearance for class when contained in container class

suggest change

Use appearanceWhenContainedInInstancesOfClasses: to customize the appearance for instance of a class when contained within an instance of container class. For example customization of UILabel’s textColor and backgroundColor within ViewController class will look like this:

Set UILabel text color

Swift:

UILabel.appearanceWhenContainedInInstancesOfClasses([ViewController.self]).textColor = UIColor.whiteColor()

Objective-C:

[UILabel appearanceWhenContainedInInstancesOfClasses:@[[ViewController class]]].textColor = [UIColor whiteColor];

Set UILabel background color

Swift:

UILabel.appearanceWhenContainedInInstancesOfClasses([ViewController.self]).backgroundColor = UIColor.blueColor()

Objective-C:

[UILabel appearanceWhenContainedInInstancesOfClasses:@[[ViewController class]]].backgroundColor = [UIColor blueColor];

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