如何更改 UISearchBar 字体大小和颜色？

Question

我 google 几个小时如何更改我的 UISearchBar 字体大小和颜色，但我找不到任何与之相关的文档。

这是我到目前为止在 swift 4:

上所做的

 searchBar = UISearchBar(frame: CGRect(x: 0, y: 0, width: view.frame.width - (menuImage.frame.width + iconImage.frame.width + 55), height: 30))
 searchBar.placeholder = "SEARCH BAR"
 searchBar.tintColor = UIColor.gray
 searchBar.delegate = self
 searchBar.font = [UIFont fontWithName:@"Oswald" size:11];

但它给了我一个错误。

你能告诉我如何更改 UISearchBar 的字体大小和颜色吗？

请帮忙!!!

Answer 1

要更改文本和占位符搜索栏：

// SearchBar text
let textFieldInsideUISearchBar = searchBar.value(forKey: "searchField") as? UITextField
textFieldInsideUISearchBar?.textColor = UIColor.red
textFieldInsideUISearchBar?.font = textFieldInsideUISearchBar?.font?.withSize(12)

// SearchBar placeholder
let labelInsideUISearchBar = textFieldInsideUISearchBar!.value(forKey: "placeholderLabel") as? UILabel
labelInsideUISearchBar?.textColor = UIColor.red

Answer 2

searchBarOutlet.setScopeBarButtonTitleTextAttributes([NSForegroundColorAttributeName: UIColor.whiteColor()], forState:UIControlState.Normal)

Answer 3

您可以使用外观代理来设置 UISearchBar 文本和占位符的样式：

更改占位符：

let placeholderAppearance = UILabel.appearance(whenContainedInInstancesOf: [UISearchBar.self])
placeholderAppearance.font = UIFont(name: "Baskerville", size: 14)
placeholderAppearance.textColor = .red

更改搜索文本：

let searchTextAppearance = UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self])
searchTextAppearance.font = UIFont(name: "Baskerville", size: 14)
searchTextAppearance.textColor = .green

Answer 4

这是更改字体和文本颜色的最新方法Swift：

let attributes = [NSAttributedString.Key.font: UIFont.boldSystemFont(15), NSAttributedString.Key.foregroundColor: UIColor.gray]
UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).defaultTextAttributes = attributes

Answer 5

在 iOS 13 或最新版本中，UISearchBar 有一个名为 searchTextField 的属性。但是更早的时候，我们不能用这个属性.

所以，我们可以扩展 UISearchBar：

extension UISearchBar {
    var textField: UITextField? {
        if #available(iOS 13.0, *) {
            return self.searchTextField
        } else {
            // Fallback on earlier versions
            for view in (self.subviews[0]).subviews {
                if let textField = view as? UITextField {
                    return textField
                }
            }
        }
        return nil
    }
}

并使用：

searchBar.textField?.font = UIFont.systemFont(ofSize: 12)

如何更改 UISearchBar 字体大小和颜色？

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