我有一个实现深蓝色UITextField的设计,因为占位符文本默认是深灰色的颜色,我几乎不能弄清楚占位符文本说什么。
我当然在谷歌上搜索过这个问题,但我还没有想出一个解决方案,而使用Swift语言而不是Obj-c。
有没有一种方法来改变一个UITextField的占位符文本颜色使用Swift?
我有一个实现深蓝色UITextField的设计,因为占位符文本默认是深灰色的颜色,我几乎不能弄清楚占位符文本说什么。
我当然在谷歌上搜索过这个问题,但我还没有想出一个解决方案,而使用Swift语言而不是Obj-c。
有没有一种方法来改变一个UITextField的占位符文本颜色使用Swift?
当前回答
就我而言,我做了以下事情:
extension UITextField {
@IBInspectable var placeHolderColor: UIColor? {
get {
if let color = self.attributedPlaceholder?.attribute(.foregroundColor, at: 0, effectiveRange: nil) as? UIColor {
return color
}
return nil
}
set (setOptionalColor) {
if let setColor = setOptionalColor {
let string = self.placeholder ?? ""
self.attributedPlaceholder = NSAttributedString(string: string , attributes:[NSAttributedString.Key.foregroundColor: setColor])
}
}
}
}
其他回答
您可以使用Interface Builder快速完成此任务,而无需添加一行代码。
选择UITextField并打开右边的标识检查器:
点击加号按钮,添加一个新的运行时属性:
placeholderLabel。textColor (Swift 4)
_placeholderLabel。textColor (Swift 3或更少)
使用颜色作为类型并选择颜色。
就是这样。
你不会看到结果,直到你再次运行你的应用程序。
它更多的是个性化你的textField,但无论如何,我将分享这段代码从另一个页面,使它更好一点:
import UIKit
extension UITextField {
func setBottomLine(borderColor: UIColor, fontColor: UIColor, placeHolderColor:UIColor, placeHolder: String) {
self.borderStyle = UITextBorderStyle.none
self.backgroundColor = UIColor.clear
let borderLine = UIView()
let height = 1.0
borderLine.frame = CGRect(x: 0, y: Double(self.frame.height) - height, width: Double(self.frame.width), height: height)
self.textColor = fontColor
borderLine.backgroundColor = borderColor
self.addSubview(borderLine)
self.attributedPlaceholder = NSAttributedString(
string: placeHolder,
attributes: [NSAttributedStringKey.foregroundColor: placeHolderColor]
)
}
}
你可以这样使用它:
self.textField.setBottomLine(borderColor: lineColor, fontColor: fontColor, placeHolderColor: placeHolderColor, placeHolder: placeHolder)
知道你有一个UITextField连接到一个ViewController。
来源:http://codepany.com/blog/swift-3-custom-uitextfield-with-single-line-input/
Swift 3(可能是2),你可以覆盖didSet占位符在UITextField子类上应用属性,这样:
override var placeholder: String? {
didSet {
guard let tmpText = placeholder else {
self.attributedPlaceholder = NSAttributedString(string: "")
return
}
let textRange = NSMakeRange(0, tmpText.characters.count)
let attributedText = NSMutableAttributedString(string: tmpText)
attributedText.addAttribute(NSForegroundColorAttributeName , value:UIColor(white:147.0/255.0, alpha:1.0), range: textRange)
self.attributedPlaceholder = attributedText
}
}
在你的应用程序中为所有UITextField设置占位符颜色,你可以这样做:
UILabel.appearanceWhenContainedInInstancesOfClasses([UITextField.self]).textColor = UIColor.redColor()
这将为整个应用程序中的所有TextField占位符设置所需的颜色。但它仅从iOS 9开始可用。
在swift中iOS 9之前没有appearenceWhenContainedIn....()方法,但您可以使用这里提供的解决方案之一
这里我正在写UITextField的所有UIDesignable。在这段代码的帮助下,你可以直接从storyboard中的UI文件Inspector中访问它
@IBDesignable
class CustomTextField: UITextField {
@IBInspectable var leftImage: UIImage? {
didSet {
updateView()
}
}
@IBInspectable var leftPadding: CGFloat = 0 {
didSet {
updateView()
}
}
@IBInspectable var rightImage: UIImage? {
didSet {
updateView()
}
}
@IBInspectable var rightPadding: CGFloat = 0 {
didSet {
updateView()
}
}
private var _isRightViewVisible: Bool = true
var isRightViewVisible: Bool {
get {
return _isRightViewVisible
}
set {
_isRightViewVisible = newValue
updateView()
}
}
func updateView() {
setLeftImage()
setRightImage()
// Placeholder text color
attributedPlaceholder = NSAttributedString(string: placeholder != nil ? placeholder! : "", attributes:[NSAttributedString.Key.foregroundColor: tintColor])
}
func setLeftImage() {
leftViewMode = UITextField.ViewMode.always
var view: UIView
if let image = leftImage {
let imageView = UIImageView(frame: CGRect(x: leftPadding, y: 0, width: 20, height: 20))
imageView.image = image
// Note: In order for your image to use the tint color, you have to select the image in the Assets.xcassets and change the "Render As" property to "Template Image".
imageView.tintColor = tintColor
var width = imageView.frame.width + leftPadding
if borderStyle == UITextField.BorderStyle.none || borderStyle == UITextField.BorderStyle.line {
width += 5
}
view = UIView(frame: CGRect(x: 0, y: 0, width: width, height: 20))
view.addSubview(imageView)
} else {
view = UIView(frame: CGRect(x: 0, y: 0, width: leftPadding, height: 20))
}
leftView = view
}
func setRightImage() {
rightViewMode = UITextField.ViewMode.always
var view: UIView
if let image = rightImage, isRightViewVisible {
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
imageView.image = image
// Note: In order for your image to use the tint color, you have to select the image in the Assets.xcassets and change the "Render As" property to "Template Image".
imageView.tintColor = tintColor
var width = imageView.frame.width + rightPadding
if borderStyle == UITextField.BorderStyle.none || borderStyle == UITextField.BorderStyle.line {
width += 5
}
view = UIView(frame: CGRect(x: 0, y: 0, width: width, height: 20))
view.addSubview(imageView)
} else {
view = UIView(frame: CGRect(x: 0, y: 0, width: rightPadding, height: 20))
}
rightView = view
}
@IBInspectable public var borderColor: UIColor = UIColor.clear {
didSet {
layer.borderColor = borderColor.cgColor
}
}
@IBInspectable public var borderWidth: CGFloat = 0 {
didSet {
layer.borderWidth = borderWidth
}
}
@IBInspectable public var cornerRadius: CGFloat = 0 {
didSet {
layer.cornerRadius = cornerRadius
}
}
@IBInspectable public var bottomBorder: CGFloat = 0 {
didSet {
borderStyle = .none
layer.backgroundColor = UIColor.white.cgColor
layer.masksToBounds = false
// layer.shadowColor = UIColor.gray.cgColor
layer.shadowOffset = CGSize(width: 0.0, height: 1.0)
layer.shadowOpacity = 1.0
layer.shadowRadius = 0.0
}
}
@IBInspectable public var bottomBorderColor : UIColor = UIColor.clear {
didSet {
layer.shadowColor = bottomBorderColor.cgColor
layer.shadowOffset = CGSize(width: 0.0, height: 1.0)
layer.shadowOpacity = 1.0
layer.shadowRadius = 0.0
}
}
/// Sets the placeholder color
@IBInspectable var placeHolderColor: UIColor? {
get {
return self.placeHolderColor
}
set {
self.attributedPlaceholder = NSAttributedString(string:self.placeholder != nil ? self.placeholder! : "", attributes:[NSAttributedString.Key.foregroundColor: newValue!])
}
}
}