Using two-stage rotation animation.

今天接了朋友台IOS4.3.1的设备，测试时发现了如下警告：

Using two-stage rotation animation. To use the smoother single-stage animation, this application must remove two-stage method implementations.

Using two-stage rotation animation is not supported when rotating more than one view controller or view controllers not the window delegate.

这在ios5以上设备测试时没有出现

设置了几个断点，终于找到了出现的地方

[self presentModalViewController: self.customTabBar animated:YES];

找了半天终于找到问题了，原来必须要初始化self.customTabBar.selectedIndex = 0;

这我也没搞懂为什么这样，不过初始化后，就不报这警告了