把一个视图转到指定的方向

代码摘自OpenFeint源码：

+ (void)transformView:(UIView*)view toOrientation:(UIInterfaceOrientation)orientation

{

    CGAffineTransform newTransform =CGAffineTransformIdentity;

    CGRect bounds = [[UIScreenmainScreen] bounds];

    CGPoint center =CGPointMake(CGRectGetMidX(bounds),CGRectGetMidY(bounds));

    switch (orientation) 

    {

            caseUIInterfaceOrientationLandscapeRight:

                    newTransform =CGAffineTransformMake(0, 1, -1, 0, 0, 0);

                    bounds =CGRectMake(0.f, 0.f, bounds.size.height, bounds.size.width);

                    break;

            caseUIInterfaceOrientationLandscapeLeft:

                    newTransform =CGAffineTransformMake(0, -1,1, 0, 0, 0);

                    bounds =CGRectMake(0.f, 0.f, bounds.size.height, bounds.size.width);

                    break;

            caseUIInterfaceOrientationPortraitUpsideDown:

                    newTransform =CGAffineTransformMake(-1, 0, 0, -1, 0, 0);

                    break;

            caseUIInterfaceOrientationPortrait:

                    newTransform =CGAffineTransformTranslate(newTransform, 0, 0);

                    break;

            default:

                    OFAssert(NO,@"invalid orientation used");

                    break;

    }

    [view setTransform:newTransform];

    view.bounds = bounds;

    view.center = center;

}