1.原因：
采用self.storyboard時掸绞，獲得的storyboard對象為空
2.修改方法：
初始化一個storyboard對象，然后使用這個對象獲得相應(yīng)的viewcontroller咽安；
3.實例
UIStoryboard *stroyboard = [UIStoryboard ? storyboardWithName:@"XXX"bundle:nil];
PhoneRegisterController *infoVC = [stroyboard ? instantiateViewControllerWithIdentifier:@"PhoneRegisterControllerID"];
[self.navigationController ?pushViewController:prVCanimated:YES];
