当我在iOS中旋转对象时，如何使对象从一侧出现？ （code + gif）里面 [英] how to make objects appear from one side when I rotate them in iOS ? (code + gif ) inside

问题描述

当我在iOS中旋转对象时，如何让对象显示（仅限一侧）？

how to make objects appear from (one side only), when I rotate them in iOS ?

我想要发生什么，（你可以看到我可以将另一张脸添加到我的UITableview单元格中）

What I want to happen, (as you can see i can add another face to my UITableview cell)

发生了什么，我甚至无法添加另一张脸，因为前一张脸再次出现

What is happening, i can't even add another face since the previous one is showing up again

我正在使用的代码

func animate()
{
    var id = CATransform3DIdentity
    id.m34 =  -1.0 / 1000

    var transformAnim            = CAKeyframeAnimation(keyPath:"transform")
    transformAnim.values         = [
        NSValue(CATransform3D: CATransform3DRotate(id, 0 * CGFloat(-M_PI_2), 0, 1.0, 0)),
        NSValue(CATransform3D: CATransform3DRotate(id, 1 * CGFloat(-M_PI_2), 0, 1.0, 0)),
        NSValue(CATransform3D: CATransform3DRotate(id, 0 * CGFloat(-M_PI_2), 0, 1.0, 0))
    ]
    transformAnim.keyTimes       = [0, 0.5, 1.0]
    transformAnim.duration       = 0.7

    self.imageViewLogo.layoutIfNeeded()

    self.imageViewLogo.layer.addAnimation(transformAnim, forKey: "transform")
}

例如，如果您知道3ds max中名为[force 2 sided]的功能，我希望它在此处转动，但似乎iOS没有这样的功能。

If you know a feature called [force 2 sided] in 3ds max for example, I want it turned of here, but it seems that iOS has no feature like this.

• 这是一个高级问题，我希望专家解答我。

谢谢。

编辑

如果你仍然不确定我在问什么，我的意思是：

if you are still not sure what I'm asking, I mean this :

如何让对象显示当我旋转时，只从一侧它？

how to make an object to show only from one side when i rotate it ?

推荐答案

解决方案是一个我之前从未听说过的简单陈述

the solution was a simple statement that I never heard of before

imageViewLogo.layer.doubleSided = false

来自apple的网站： -

from apple's website :-

一个布尔值，指示当
面临时，图层是否显示其内容来自观众。动画。

A Boolean indicating whether the layer displays its content when facing away from the viewer. Animatable.

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