ios - 翻转图像以供按钮使用

Question

我的应用程序中有一些按钮是这样声明的:

let infoButton = UIButton(type: UIButtonType.InfoLight) as UIButton
infoButton.addTarget(self, action: "toggleInfo", forControlEvents: UIControlEvents.TouchUpInside)
self.navigationItem.rightBarButtonItem  = UIBarButtonItem(customView: infoButton)

在将图像分配给我的 NavigationBar 之前，有没有办法从系统定义的按钮本身(例如垂直方向)镜像图像？

Answer 1

你可以试试这个:

    CGAffineTransform transform = CGAffineTransformMakeRotation(M_PI * 0.05);
    UIView *view = [buttonItem valueForKey:@"view"];
    view.transform = transform;

在这里查看他们如何制作动画:https://gist.github.com/bergholdt/0db2d2264e29e3646e9c