Question

我正在尝试构建一个霓虹灯的iOS应用，该霓虹灯会像真实的霓虹灯一样连续不断地闪烁。

我不确定如何使动画不断重复，也不确定如何使其自动且永久地运行。我把它放在viewDidLoad中，但是我不确定那是否真的是放置它的最佳地方？

    UIImageView.animate(withDuration: 0.05, delay: 5.0, options: .repeat, animations: {
        UIImageView.animate(withDuration: 0.05, delay: 2.0, animations: {
            self.Aletter.alpha = 0.2
        }) { (_) in
            UIImageView.animate(withDuration: 0.05, delay: 0.0, animations: {
                self.Aletter.alpha = 1.0
            }, completion: { (_) in
                UIImageView.animate(withDuration: 0.05, delay: 2.0, animations: {
                    self.Aletter.alpha = 0.6
                }, completion: { (_) in
                    UIImageView.animate(withDuration: 0.05, delay: 0.0, animations: {
                        self.Aletter.alpha = 1.0
                    }, completion: { (_) in
                        UIImageView.animate(withDuration: 0.05, delay: 0.0, animations: {
                            self.Aletter.alpha = 0.6
                        }, completion: { (_) in
                            UIImageView.animate(withDuration: 0.05, delay: 0.0, animations: {
                                self.Aletter.alpha = 1.0
                            }, completion: { (_) in
                                UIImageView.animate(withDuration: 0.05, delay: 0.0, animations: {
                                    self.Aletter.alpha = 0.6
                                }, completion: { (_) in
                                    UIImageView.animate(withDuration: 0.05, delay: 0.0, animations: {
                                        self.Aletter.alpha = 1.0
                                    }, completion: { (_) in

                                    })
                                })
                            })
                        })
                    })
                })
            })
        }
    })

此代码将运行我的一系列闪烁，但仅运行一次。我需要它不断前进。

Answer 1

如马特（Matt）在评论部分中所建议的，您可以使用类似以下的内容：

private func flicker() { [weak self] in
    UIView.animate(withDuration: 0.05, animations: {
        self?.Aletter.alpha = CGFloat.random(in: 0.1...1.0)
    }) { _ in
        // When this round of animations completes call the same method again to start the animations again with a new random value for alpha.
        self?.flicker()
    }
}

只需在您的flicker()中呼叫viewDidLoad()。 flicker方法使用Aletter视图的随机alpha值启动动画，并在动画完成后再次调用自身。

请注意，根据变量，使用小写的首字母，Aletter应该是aletter或aLetter，具体取决于上下文。

如何为iOS中不断闪烁的灯光设置动画？

1 个答案: