IOS翻转注意

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);        
    }
}