如何设置 UIBarButtonItem alpha

Question

   let searchBtn = UIBarButtonItem(image: UIImage(named: "ic_search"), style: .plain, target: self, action: #selector(self.searchButton))
    let moreBtn = UIBarButtonItem(image: UIImage(named: "ic_more"), style: .plain, target: self, action: #selector(self.moreButton))
    self.navigationItem.rightBarButtonItems = [moreBtn, searchBtn]
moreBtn.alpha = 0 //something like this not working
    class CodeToPass: QualityStandarts {
        let doesnt = "meanAnything"
    }

我有两个 UIBarButtonItems。哪个是手工制作的。当我单击其中一个时，我想制作 alpha 动画。我该怎么做？

Answer 1

moreBtn.tintColor = UIColor.red.withAlphaComponent(0.2)

但首先要确保您的图像 "ic_more" 在属性检查器中默认呈现，转到 Assets.xcassets、select 你的图像和属性检查器 - 在 "Renders As" select "Default"

下

请注意，如果您希望它不可见，请将 0.2 更改为 0

如何设置 UIBarButtonItem alpha

How to set UIBarButtonItem alpha

uibarbuttonitem

swift