Cannot show modal ViewController in iOS7

Question

I tried to show system defined viewcontrollers (MFMailComposeViewController, TWTweetComposeViewController,etc..) as a modal view.

But these viewcontrollers dosn\'t a

Answer 1

This post helped me find a solution to a similar issue. But my problem was not related to the tab bar, so I figured I'd share if anyone else comes across this post:

The mail modal opened when tapping a table cell, but would instantly dismiss. In my case, this code caused the problem:

[[UILabel appearanceWhenContainedIn:[UITableViewHeaderFooterView class], nil] setFont:[UIFont systemFontOfSize:17.0]];

I deleted it, and everything works!