swift - 如何编辑 UIBlurEffect 强度？

Question

我不希望我的背景图片太模糊。没有调整模糊强度的属性吗？

let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.Light)
blurEffect.???
let effectView = UIVisualEffectView(effect: blurEffect)
effectView.frame = backgroundAlbumCover.bounds
backgroundAlbumCover.addSubview(effectView)

Answer 1

你可以用动画师以 super 优雅的方式做到这一点

(降低 UIVisualEffectView alpha 不会影响模糊强度，所以我们必须使用 animator)

用法很简单:

let blurEffectView = BlurEffectView()
view.addSubview(blurEffectView)

BlurEffectView实现:

class BlurEffectView: UIVisualEffectView {
    
    var animator = UIViewPropertyAnimator(duration: 1, curve: .linear)
    
    override func didMoveToSuperview() {
        guard let superview = superview else { return }
        backgroundColor = .clear
        frame = superview.bounds //Or setup constraints instead
        setupBlur()
    }
    
    private func setupBlur() {
        animator.stopAnimation(true)
        effect = nil

        animator.addAnimations { [weak self] in
            self?.effect = UIBlurEffect(style: .dark)
        }
        animator.fractionComplete = 0.1   //This is your blur intensity in range 0 - 1
    }
    
    deinit {
        animator.stopAnimation(true)
    }
}