UIView flip vertically

问题

I know it's probably a dummy question, but I have to ask: How to flip a UIView vertically? I'm not asking for doing a animation, but just flip it.

I can do vertical flip a UILabel by:

label1.layer.transform = CATransform3DMakeRotation(M_PI, 1.0f, 0.0f, 0.0f);

and turn it back by:

label1.layer.transform = CATransform3DMakeRotation(M_PI, 0.0f, 0.0f, 0.0f);

But when I'm doing it to a view:

self.view.layer.transform = CATransform3DMakeRotation(M_PI, 1.0f, 0.0f, 0.0f);

I think it only rotate half way... So, any ideas?

Thanks guys.

回答1:

I realize this is an old question, but I'll leave this here anyway. The following would flip the view vertically using just the y-scale of the layer, so it would be my preference:

self.view.layer.transform = CGAffineTransform(scaleX: 1, y: -1)

来源：https://stackoverflow.com/questions/9627006/uiview-flip-vertically