翻转时，要计算好。如下是6个button的翻转中 frame 的改变
- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
if (toInterfaceOrientation == UIInterfaceOrientationPortrait || toInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) {//翻转0或180度时的情况
button1.frame = CGRectMake(20, 20, 125, 125);
button2.frame = CGRectMake(175, 20, 125, 125);
button3.frame = CGRectMake(20, 168, 125, 125);
button4.frame = CGRectMake(175, 168, 125, 125);
button5.frame = CGRectMake(20, 315, 125, 125);
button6.frame = CGRectMake(175, 315, 125, 125);
}
else //翻转90或270度时的情况
{
button1.frame = CGRectMake(20, 20, 125, 125);
button2.frame = CGRectMake(20, 155, 125, 125);
button3.frame = CGRectMake(177, 20, 125, 125);
button4.frame = CGRectMake(177, 155, 125, 125);
button5.frame = CGRectMake(328, 20, 125, 125);
button6.frame = CGRectMake(328, 155, 125, 125);
}
}