swift - 快速搜索带有圆角半径的栏

Question

我想创建一个像上图一样的 View 。它有一个带有圆角半径的搜索栏。但是当我尝试创建时，我无法制作带有圆角半径的搜索栏。我也无法制作带有圆角半径的搜索栏的文本字段。我已经在 viewDidAppear 方法中编写了所有代码。没关系，否则我必须将它写在 viewWillLayourSubview 中。这样我就能做出准确的与此图像相同的搜索栏。我还希望搜索图标稍微靠右。

我的代码是:

override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(true)

for subView in searchBar.subviews  {


    for subsubView in subView.subviews  {
        if let textField = subsubView as? UITextField {
            var bounds: CGRect
            var placeHolder = NSMutableAttributedString()
            let Name  = "Search"
            placeHolder = NSMutableAttributedString(string:Name, attributes: [NSAttributedString.Key.font:UIFont(name: "Helvetica", size: 15.0)!])


            placeHolder.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.gray, range:NSRange(location:0,length:Name.count))

            textField.attributedPlaceholder = placeHolder

            if let leftView = textField.leftView as? UIImageView {
                leftView.image = leftView.image?.withRenderingMode(.alwaysTemplate)

                leftView.frame.size.width = 15.0
                leftView.frame.size.height = 15.0
                leftView.tintColor = UIColor.gray

            }
            textField.layer.cornerRadius = 50.0

            bounds = textField.frame
            bounds.size.width = searchBar.frame.width
            bounds.size.height = searchBar.frame.height
            textField.bounds = bounds
            textField.borderStyle = UITextField.BorderStyle.roundedRect

            searchBar.backgroundImage = UIImage()
            textField.backgroundColor =  UIColor.lightGray.withAlphaComponent(0.2)
            searchBar.searchTextPositionAdjustment = UIOffset(horizontal: 5, vertical: 0)

        }
    }
}
 }*

Answer 1

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(true)

    for subView in searchBar.subviews  {
        if !subView.subviews.contains(where: { $0 as? UITextField != nil }) { continue }
        guard let textField = subView.subviews.first(where: { $0 as? UITextField != nil }) as? UITextField else { return }

        let placeholder = NSMutableAttributedString(
            string: "Search",
            attributes: [.font: UIFont(name: "Helvetica", size: 15.0)!,
                         .foregroundColor: UIColor.gray
                         ])
        textField.attributedPlaceholder = placeholder
        textField.borderStyle = UITextField.BorderStyle.roundedRect

        textField.layer.cornerRadius = textField.frame.size.height / 2
        textField.layer.masksToBounds = true
        textField.textColor = .white
        textField.backgroundColor = .lightGray
    }

    searchBar.barTintColor = .white
    searchBar.backgroundColor = .white
    searchBar.searchTextPositionAdjustment = UIOffset(horizontal: 5, vertical: 0)
}

在您链接的图片中看起来并不完全一样，但实际上比您编写的代码更适合 Apple 设计并且工作得更好。

对于任何更复杂的东西，我建议创建一个自定义的 UISearchBar 子类。

注意 Apple 的 Human Interface Guidelines ，因此 AppStore 可能不会接受任何过于疯狂/与默认设置不同的内容。