swift – 如何设置UIBarButtonItem alpha

发布时间：2020-12-14 02:25:38 所属栏目：百科来源：网络整理

导读：let searchBtn = UIBarButtonItem(image: UIImage(named: "ic_search"),style: .plain,target: self,action: #selector(self.searchButton)) let moreBtn = UIBarButtonItem(image: UIImage(named: "ic_more"),action: #selector(self.moreButton)) self.nav

let searchBtn = UIBarButtonItem(image: UIImage(named: "ic_search"),style: .plain,target: self,action: #selector(self.searchButton))
    let moreBtn = UIBarButtonItem(image: UIImage(named: "ic_more"),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.这是手工制作的.当我点击其中一个时,我想要动画阿尔法.我该怎么做？

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

但首先要确保您的图像“ic_more”在属性检查器中呈现为默认值,
转到Assets.xcassets,选择您的图像,然后从属性检查器 – 在“Renders As”下选择“Default”

请注意,如果你想要它隐形改变0.2到0

（编辑：李大同）

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