ios - Swift 按钮无缘无故变蓝

Question

我在 swift 中有一个蓝色的按钮，我不知道为什么。我在两个不同的 View Controller 中使用相同的代码，并且出于某种原因，一个是蓝色的。

我对 iOS 开发还是个新手，所以我想知道是否有人对此有所了解？

它们都使用相同的功能。并且没有蓝色的 Assets 。我尝试使用不同的图标，但它不是蓝色的。

我还检查了按钮上是否实现了任何颜色更改，但没有调用它。

private func prepareSearchView() {
        searchShadowView.backgroundColor = .white

        searchShadowView.layer.shadowColor = UIColor.black.cgColor
        searchShadowView.layer.shadowOffset = CGSize(width: 1, height: 1)
        searchShadowView.layer.shadowOpacity = 0.3
        searchShadowView.layer.shadowRadius = 2
        searchShadowView.layer.masksToBounds =  false
        searchShadowView.layer.cornerRadius = 2

        view.addSubview(searchShadowView)
        view.bringSubview(toFront: searchShadowView)

        searchShadowView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            searchShadowView.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 20),
            searchShadowView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
            searchShadowView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20),
            searchShadowView.heightAnchor.constraint(equalToConstant: searchViewHeight)
            ])

        searchView.backgroundColor = .white
        searchView.layer.borderWidth = 1
        searchView.layer.borderColor = UIColor.segmentedControlBackgroundGray.cgColor

        view.addSubview(searchView)
        view.bringSubview(toFront: searchView)

        searchView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            searchView.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 20),
            searchView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
            searchView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20),
            searchView.heightAnchor.constraint(equalToConstant: searchViewHeight)
            ])

        let glassImageView = UIImageView(image: #imageLiteral(resourceName: "glassIcon"))
        searchView.addSubview(glassImageView)
        glassImageView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            glassImageView.topAnchor.constraint(equalTo: searchView.topAnchor, constant: 14),
            glassImageView.leadingAnchor.constraint(equalTo: searchView.leadingAnchor, constant: 20),
            glassImageView.bottomAnchor.constraint(equalTo: searchView.bottomAnchor, constant: -14),
            glassImageView.widthAnchor.constraint(equalToConstant: 19)
            ])

        let searchButton = UIButton(type: .custom)
        searchButton.setTitle("Where do you want to eat?", for: .normal)
        searchButton.setTitleColor(.placeHolderGray, for: .normal)
        searchButton.titleLabel?.font = UIFont.mediumFont(ofSize: 15.0)
        searchButton.titleLabel?.adjustsFontSizeToFitWidth = true
        searchButton.addTarget(self, action: #selector(searchButtonPressed), for: .touchUpInside)

        searchView.addSubview(searchButton)
        searchButton.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            searchButton.topAnchor.constraint(equalTo: searchView.topAnchor),
            searchButton.leadingAnchor.constraint(equalTo: glassImageView.trailingAnchor, constant: 10),
            searchButton.heightAnchor.constraint(equalTo: searchView.heightAnchor),
            ])

        filterButton.setImage(#imageLiteral(resourceName: "filterIcon"), for: .normal)
        filterButton.addTarget(self, action: #selector(filterButtonPressed), for: .touchUpInside)
        searchView.addSubview(filterButton)
        filterButton.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            filterButton.topAnchor.constraint(equalTo: searchView.topAnchor),
            filterButton.leadingAnchor.constraint(equalTo: searchButton.trailingAnchor, constant: 10),
            filterButton.bottomAnchor.constraint(equalTo: searchView.bottomAnchor),
            filterButton.trailingAnchor.constraint(equalTo: searchView.trailingAnchor, constant: -20),
            filterButton.widthAnchor.constraint(equalToConstant: 25)
            ])
    }

Answer 1

这是由于图像作为模板并采用按钮色调颜色。您可以通过使用不同的渲染模式复制图像来阻止这种情况的发生:

filterButton.setImage(#imageLiteral(resourceName: "filterIcon").withRenderingMode(.alwaysOriginal), for: .normal)