iOS 5: Curious about UIAppearance

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a) How do I know which instances of a class work with the appearance property? For e.g. since UITableView conforms to the UIAppearance protocol I was thinking I could do something like

You look in the header of the class (and the headers of all the superclasses). Any method that has UI_APPEARANCE_SELECTOR next to it is supported for use with the UIAppearance proxy.

[[UITableView appearance] setBackgroundColor:mytableViewColor];

The backgroundColor property is not decorated with UI_APPEARANCE_SELECTOR in UIView.h. Thus it is not technically supported for use with the appearance proxy. It will probably work, but (given the lack of method decoration) isn’t guaranteed to.

From the UIAppearance Protocol Reference:

To support appearance customization, a class must conform to the UIAppearanceContainer protocol and relevant accessor methods must be marked with UI_APPEARANCE_SELECTOR.

(note “and relevant accessor methods must be marked…” [emphasis added])

b) Is there a list of all properties that are manipulatable with the appearance property?

Is there a single page showing every setter that works with the appearance proxy? I don’t know of one, nor is there a way to build the list at runtime.

c) At what point is the appearance customization being called? I was hoping to make changes threw the appearance property at runtime, but unfortunately the changes aren’t taking place.

You can use the appearance proxy at any point during execution. The changes won’t be applied to the affected views until the next time those views have their -layoutSubviews method invoked.

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