iOS 13设置UISearchTextField占位符颜色 [英] iOS 13 Set UISearchTextField placeholder color

问题描述

如何设置iOS 13 UISearchTextField的占位符颜色?

How do you set the placeholder color of iOS 13's UISearchTextField?

我尝试了以下操作，但均未成功

I tried the following with no success:

searchField.attributedPlaceholder = NSAttributedString(string: "Some placeholder", attributes: [NSAttributedString.Key.foregroundColor: UIColor.red])

这是当前Beta中的错误，还是我错过了一些事情?我正在使用Xcode 11，Beta 7.

Is this a bug in the current beta or do I miss something? I am using Xcode 11, beta 7.

推荐答案

您可以尝试使用Xcode 11，iOS 13

 extension UISearchBar {

        func getTextField() -> UITextField? { return value(forKey: "searchField") as? UITextField }
        func set(textColor: UIColor) { if let textField = getTextField() { textField.textColor = textColor } }
        func setPlaceholder(textColor: UIColor) { getTextField()?.setPlaceholder(textColor: textColor) }
        func setClearButton(color: UIColor) { getTextField()?.setClearButton(color: color) }

        func setTextField(color: UIColor) {
            guard let textField = getTextField() else { return }
            switch searchBarStyle {
            case .minimal:
                textField.layer.backgroundColor = color.cgColor
                textField.layer.cornerRadius = 8
            case .prominent, .default: textField.backgroundColor = color
            @unknown default: break
            }
        }

        func setSearchImage(color: UIColor) {
            guard let imageView = getTextField()?.leftView as? UIImageView else { return }
            imageView.tintColor = color
            imageView.image = imageView.image?.withRenderingMode(.alwaysTemplate)
        }
    }

    private extension UITextField {

    private class Label: UILabel {
        private var _textColor = UIColor.lightGray
        override var textColor: UIColor! {
            set { super.textColor = _textColor }
            get { return _textColor }
        }

        init(label: UILabel, textColor: UIColor = .lightGray) {
            _textColor = textColor
            super.init(frame: label.frame)
            self.text = label.text
            self.font = label.font
        }

        required init?(coder: NSCoder) { super.init(coder: coder) }
    }


    private class ClearButtonImage {
        static private var _image: UIImage?
        static private var semaphore = DispatchSemaphore(value: 1)
        static func getImage(closure: @escaping (UIImage?)->()) {
            DispatchQueue.global(qos: .userInteractive).async {
                semaphore.wait()
                DispatchQueue.main.async {
                    if let image = _image { closure(image); semaphore.signal(); return }
                    guard let window = UIApplication.shared.windows.first else { semaphore.signal(); return }
                    let searchBar = UISearchBar(frame: CGRect(x: 0, y: -200, width: UIScreen.main.bounds.width, height: 44))
                    window.rootViewController?.view.addSubview(searchBar)
                    searchBar.text = ""
                    searchBar.layoutIfNeeded()
                    _image = searchBar.getTextField()?.getClearButton()?.image(for: .normal)
                    closure(_image)
                    searchBar.removeFromSuperview()
                    semaphore.signal()
                }
            }
        }
    }

    func setClearButton(color: UIColor) {
        ClearButtonImage.getImage { [weak self] image in
            guard   let image = image,
                let button = self?.getClearButton() else { return }
            button.imageView?.tintColor = color
            button.setImage(image.withRenderingMode(.alwaysTemplate), for: .normal)
        }
    }

    var placeholderLabel: UILabel? { return value(forKey: "placeholderLabel") as? UILabel }

    func setPlaceholder(textColor: UIColor) {
        guard let placeholderLabel = placeholderLabel else { return }
        let label = Label(label: placeholderLabel, textColor: textColor)
        placeholderLabel.removeFromSuperview() // To remove existing label. Otherwise it will overwrite it if called multiple times.
        setValue(label, forKey: "placeholderLabel")
    }

    func getClearButton() -> UIButton? { return value(forKey: "clearButton") as? UIButton }

}

使用:

    searchBarObj.placeholder = "placeholder text"
    searchBarObj.set(textColor: .blue)
    searchBarObj.setTextField(color: UIColor.gray)
    searchBarObj.setPlaceholder(textColor: .red)
    searchBarObj.setSearchImage(color: .black)
    searchBarObj.setClearButton(color: .red)

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