Question

您好我正在尝试使用youtube UI功能实现播放器。我在swift中得到了一个示例代码，所以我将其转换为Objective-C但是我无法转换底部代码行。任何人都可以转换吗？

let scale = CGAffineTransform.init(scaleX: (1 - 0.5 * scaleFactor), y: (1 - 0.5 * scaleFactor))
    let trasform = scale.concatenating(CGAffineTransform.init(translationX: -(self.player.bounds.width / 4 * scaleFactor), y: -(self.player.bounds.height / 4 * scaleFactor)))
    self.player.transform = trasform

Answer 1

我认为这是以下代码，我没有测试过，因为我不知道结果。

CGAffineTransform *scale = CGAffineTransformMakeScale((1 - 0.5 * scaleFactor), (1 - 0.5 * scaleFactor));
CGAffineTransform *scale2 = CGAffineTransformMakeTranslation(-(self.player.bounds.width / 4 * scaleFactor), -(self.player.bounds.height / 4 * scaleFactor));
// concat the 2 CGAffineTransforms. 
CGAffineTransform *transform = CGAffineTransformConcat(scale, scale2);
self.player.transform = transform;

这个Swift代码的等效代码是什么？

1 个答案: