我已经尝试了几个小时的搜索结果，但我无法弄清楚这一点。也许这是不可能的。我正在尝试更改 UISearchBar 的占位符文本和放大镜的色调。如果这很重要，我只针对 iOS 8.0+。这是我的代码以及它现在的样子：
let searchBar = UISearchBar()
searchBar.placeholder = "Search"
searchBar.searchBarStyle = UISearchBarStyle.Minimal
searchBar.tintColor = UIColor.whiteColor()
我希望搜索和放大镜是白色的，或者可能是深绿色。
【问题讨论】：
标签： ios iphone xcode swift uikit
import UIKit
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 = 6
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 = "txt"
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)
setValue(label, forKey: "placeholderLabel")
}
func getClearButton() -> UIButton? { return value(forKey: "clearButton") as? UIButton }
}
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let searchBar = UISearchBar(frame: CGRect(x: 0, y: 20, width: UIScreen.main.bounds.width, height: 44))
searchBar.searchBarStyle = .default
view.addSubview(searchBar)
searchBar.placeholder = "placeholder"
searchBar.set(textColor: .brown)
searchBar.setTextField(color: UIColor.green.withAlphaComponent(0.3))
searchBar.setPlaceholder(textColor: .white)
searchBar.setSearchImage(color: .white)
searchBar.setClearButton(color: .red)
}
}
【讨论】：
UISearchController，您需要继承UISearchController 和UISearchBar。即使那样，清除按钮着色仍然不起作用。任何想法为什么？
ClearButtonColor 在 iOS 12.0 中不起作用。
如果您有可以使用的自定义图像，则可以使用类似于以下内容的方式设置图像并更改占位符文本颜色：
[searchBar setImage:[UIImage imageNamed:@"SearchWhite"] forSearchBarIcon:UISearchBarIconSearch state:UIControlStateNormal];
UITextField *searchTextField = [searchBar valueForKey:@"_searchField"];
if ([searchTextField respondsToSelector:@selector(setAttributedPlaceholder:)]) {
UIColor *color = [UIColor purpleColor];
[searchTextField setAttributedPlaceholder:[[NSAttributedString alloc] initWithString:@"Search" attributes:@{NSForegroundColorAttributeName: color}]];
}
在该示例中，我使用了 PurpleColor，您可以使用 + (UIColor *)colorWithRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue alpha:(CGFloat)alpha 方法来创建您的自定义深绿色。
编辑：我刚刚意识到你正在用swift写它......呃。快速输入，所以我没有在 Obj-C 中留下答案。
searchBar.setImage(UIImage(named: "SearchWhite"), forSearchBarIcon: UISearchBarIcon.Search, state: UIControlState.Normal);
var searchTextField: UITextField? = searchBar.valueForKey("searchField") as? UITextField
if searchTextField!.respondsToSelector(Selector("attributedPlaceholder")) {
var color = UIColor.purpleColor()
let attributeDict = [NSForegroundColorAttributeName: UIColor.purpleColor()]
searchTextField!.attributedPlaceholder = NSAttributedString(string: "search", attributes: attributeDict)
}
Swift 3.0
var searchTextField: UITextField? = searchBar.value(forKey: "searchField") as? UITextField
if searchTextField!.responds(to: #selector(getter: UITextField.attributedPlaceholder)) {
let attributeDict = [NSForegroundColorAttributeName: UIColor.white]
searchTextField!.attributedPlaceholder = NSAttributedString(string: "Search", attributes: attributeDict)
}
【讨论】：
searchBar.valueForKey("searchField") as? UITextField，这太棒了。您是否也知道如何更改清除按钮（小圆 x）？
Swift 3：如果要更改占位符、清除按钮和放大镜玻璃
let textFieldInsideSearchBar = searchBar.value(forKey: "searchField") as? UITextField
textFieldInsideSearchBar?.textColor = UIColor.white
let textFieldInsideSearchBarLabel = textFieldInsideSearchBar!.value(forKey: "placeholderLabel") as? UILabel
textFieldInsideSearchBarLabel?.textColor = UIColor.white
let clearButton = textFieldInsideSearchBar?.value(forKey: "clearButton") as! UIButton
clearButton.setImage(clearButton.imageView?.image?.withRenderingMode(.alwaysTemplate), for: .normal)
clearButton.tintColor = UIColor.white
let glassIconView = textFieldInsideSearchBar?.leftView as? UIImageView
glassIconView?.image = glassIconView?.image?.withRenderingMode(.alwaysTemplate)
glassIconView?.tintColor = UIColor.white
【讨论】：
可以在不违反私有api规则的情况下更改文字颜色：
UILabel.appearanceWhenContainedInInstancesOfClasses([UITextField.self]).textColor = UIColor.whiteColor()
【讨论】：
我无法使其与上述任何解决方案一起正常工作。
我创建了以下 UISearchBar 类别，它可以在 iOS 8.4 和 10.3 上正常工作：
UISearchBar+PlaceholderColor.h
#import <UIKit/UIKit.h>
@interface UISearchBar (PlaceholderColor)
- (void)setPlaceholderColor:(UIColor *)placeholderColor;
@end
UISearchBar+PlaceholderColor.m
#import "UISearchBar+PlaceholderColor.h"
@implementation UISearchBar (PlaceholderColor)
- (void)setPlaceholderColor:(UIColor *)placeholderColor {
UILabel *labelView = [self searchBarTextFieldLabelFromView:self];
[labelView setTextColor:placeholderColor];
}
- (UILabel *)searchBarTextFieldLabelFromView:(UIView *)view {
for (UIView *v in [view subviews]) {
if ([v isKindOfClass:[UILabel class]]) {
return (UILabel *)v;
}
UIView *labelView = [self searchBarTextFieldLabelFromView:v];
if (labelView) {
return (UILabel *)labelView;
}
}
return nil;
}
@end
用法：
[mySearchBar setPlaceholderColor:[UIColor redColor]];
重要提示：
确保调用 setPlaceholderColor:AFTER 您的 UISearchBar 已添加到视图并创建了其视图层次结构。
如果您以编程方式打开搜索栏，请将其称为 AFTER 您的 becomeFirstResponder 调用，如下所示：
[mySearchBar becomeFirstResponder];
[searchBar setPlaceholderColor:[UIColor redColor]];
否则，如果您使用 UISearchBarDelegate：
- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {
[searchBar setPlaceholderColor:[UIColor redColor]];
}
【讨论】：
extension UISearchBar {
var textField: UITextField? { return value(forKey: "searchField") as? UITextField }
var placeholderLabel: UILabel? { return textField?.value(forKey: "placeholderLabel") as? UILabel }
var icon: UIImageView? { return textField?.leftView as? UIImageView }
var iconColor: UIColor? {
get {
return icon?.tintColor
}
set {
icon?.image = icon?.image?.withRenderingMode(.alwaysTemplate)
icon?.tintColor = newValue
}
}
}
【讨论】：
我做了一个 Swift 4.1 搜索栏扩展：
import Foundation
import UIKit
extension UISearchBar{
func setTextField(placeHolderColor:UIColor = .gray,placeHolder:String = "Search Something",textColor:UIColor = .white,backgroundColor:UIColor = .black,
placeHolderFont:UIFont = UIFont.systemFont(ofSize: 12.0),
textFont:UIFont = UIFont.systemFont(ofSize: 12.0) ){
for item in self.subviews{
for mainView in (item as UIView).subviews{
mainView.backgroundColor = backgroundColor
if mainView is UITextField{
let textField = mainView as? UITextField
if let _textF = textField{
_textF.text = "success"
_textF.textColor = textColor
_textF.font = textFont
_textF.attributedPlaceholder = NSMutableAttributedString.init(string: placeHolder, attributes: [NSAttributedStringKey.foregroundColor : placeHolderColor,
NSAttributedStringKey.font : placeHolderFont])
}
}
}
}
}
}
您可以将其用于您的searchBar，如下所示：
controller.searchBar.setTextField(placeHolderColor: .white,
placeHolder: "Search A Pet",
textColor: .white,
backgroundColor: .green,
placeHolderFont: UIFont.systemFont(ofSize: 14.0),
textFont: UIFont.systemFont(ofSize: 14.0))
【讨论】：
我找到了一种方法来更改搜索栏中的文本文件。 它适用于 swift 3 和 Xcode8。
首先，继承 UISearchBar 类。
class CustomSearchBar: UISearchBar {
UISearchBar 包含一个视图，其中包含您想要的重要文本字段。以下函数获取子视图中的索引。
func indexOfSearchFieldInSubviews() -> Int! {
var index: Int!
let searchBarView = subviews[0]
for (i, subview) in searchBarView.subviews.enumerated() {
if subview.isKind(of: UITextField.self) {
index = i
break
}
}
return index
}
override func draw(_ rect: CGRect) {
// Find the index of the search field in the search bar subviews.
if let index = indexOfSearchFieldInSubviews() {
// Access the search field
let searchField: UITextField = subviews[0].subviews[index] as! UITextField
// Set its frame.
searchField.frame = CGRect(x: 5, y: 5, width: frame.size.width - 10, height: frame.size.height - 10)
// Set the font and text color of the search field.
searchField.font = preferredFont
searchField.textColor = preferredTextColor
// Set the placeholder and its color
let attributesDictionary = [NSForegroundColorAttributeName: preferredPlaceholderColor.cgColor]
searchField.attributedPlaceholder = NSAttributedString(string: preferredPlaceholder, attributes: attributesDictionary)
// Set the background color of the search field.
searchField.backgroundColor = barTintColor
}
super.draw(rect)
}
你去吧，享受这个。
【讨论】：
对 Vasily Bodnarchuk 出色答案的小幅更新。
斯威夫特 4+
NSForegroundColorAttributeName 已更改为NSAttributedStringKey.foregroundColor
【讨论】：
对于任何试图更改文本但无法看到更新的占位符的人，将其放在此处而不是 viewDidLoad 对我有用。
- (void)viewDidLayoutSubviews {
[super viewDidLayoutSubviews];
self.searchBar.placeholder = @"My Custom Text";
}
【讨论】：
刚刚找到这个帖子，对不起，考虑到年龄的问题。然而，它帮助我尝试解决我的问题，并添加到@m_katsifarakis 的答案中，我在他现有的类别中添加了更多内容。
为占位符和输入文本添加额外的颜色和字体支持。
仅在 iOS 13 上进行了测试，因为这就是我所支持的全部。
@interface UISearchBar (ColorandFont)
- (void)setPlaceholderColor:(UIColor *)placeholderColor setPlaceholderFont:(UIFont *)placeholderFont;
- (void)setTextColor:(UIColor *)textColor setTextFont:(UIFont *)textFont;
@end
@implementation UISearchBar (ColorandFont)
//Placeholder Color
- (void)setPlaceholderColor:(UIColor *)placeholderColor setPlaceholderFont:(UIFont *)placeholderFont{
UILabel *labelView = [self placeholderText:self];
[labelView setTextColor:placeholderColor];
[labelView setFont:placeholderFont];
}
- (UILabel *)placeholderText:(UIView *)view {
for (UIView *v in [view subviews]) {
if ([v isKindOfClass:[UILabel class]]) {
return (UILabel *)v;
}
UIView *labelView = [self placeholderText:v];
if (labelView) {
return (UILabel *)labelView;
}
}
return nil;
}
//Text Color
- (void)setTextColor:(UIColor *)textColor setTextFont:(UIFont *)textFont{
UITextField *textView = [self searchBarText:self];
[textView setTextColor:textColor];
[textView setFont:textFont];
}
- (UITextField *)searchBarText:(UIView *)view {
for (UIView *v in [view subviews]) {
if ([v isKindOfClass:[UITextField class]]) {
return (UITextField *)v;
}
UIView *textView = [self searchBarText:v];
if (textView) {
return (UITextField *)textView;
}
}
return nil;
}
@end
使用（我在 viewDidLoad 和 Appear 中使用）给定我当前的设置，结果可能会有所不同：
[self.searchBar setPlaceholderColor:[UIColor lightTextColor] setPlaceholderFont:[UIFont italicSystemFontOfSize:13]];
[self.searchBar setTextColor:[UIColor whiteColor] setTextFont:[UIFont systemFontOfSize:16]];
【讨论】：
在 Swift 4 中，假设您的搜索控制器设置如下：
let searchController = UISearchController(searchResultsController: nil)
然后设置占位符文本如下：
searchController.searchBar.placeholder = "Here is my custom text"
【讨论】：