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//获取someboard中InitialViewController
UIStoryboard *story = [UIStoryboard storyboardWithName:@"someboard" bundle:nil];
self.window.rootViewController = [story instantiateInitialViewController];
//获取someboard中identity为storyboardID的控制器
UIStoryboard *story = [UIStoryboard storyboardWithName:@"someboard" bundle:nil];
self.window.rootViewController = [story instantiateViewControllerWithIdentifier:@"storyboardID"];
- (BOOL)becomeFirstResponder; // 成为第一响应者（文本框获得焦点并调出键盘）
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原文地址：http://www.cnblogs.com/linxiu-0925/p/5058150.html
