I'm getting pretty tiered of Flat VS Skeumorphism...
Flat design is not an approach nor a "style". Its a trend, and with every design trend it dies and gets a place in the pocket of great designer.
Design is about thinking of solutions for a problem. If "flat" design is the solution then use flat design, If skeumorphism is the best solution use Skeumorphism. Fact is that everything has skeumorphism. it starts with the terms like web PAGES it isn't a real page so the its referring to a real life example so only the term is already skeumorphism. The same counts for buttons the button isn't necessary for the function, but we do it to make things clearer and make people understand how it should be used.
So to ay skeumorphism is bad just doesn't make sense. So get over it embrace the fact there will always be skeumorphism and that flat design isn't the solution for iOS.