Swift 在 UITextField 中添加图标/图像
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【中文标题】Swift 在 UITextField 中添加图标/图像【英文标题】:Swift add icon/image in UITextField 【发布时间】:2015-01-12 13:50:46 【问题描述】:我想在 UITextField 中添加图标/图像。图标/图像应留给占位符。
我试过这个:
var imageView = UIImageView();
var image = UIImage(named: "email.png");
imageView.image = image;
emailField.leftView = imageView;
谢谢。
【问题讨论】:
你不小心添加了分号 :DemailField.leftView = UIImageView(image: UIImage(named: "search"))
:)
使用@IBDesignable
,我们可以以优雅的方式做到这一点,如本例所示:***.com/a/51841433/8238512
【参考方案1】:
Sahil 有一个很好的答案,我想将其扩展为 @IBDesignable,以便开发人员可以将图像添加到 Storyboard 上的 UITextFields。
斯威夫特 4.2
import UIKit
@IBDesignable
class DesignableUITextField: UITextField
// Provides left padding for images
override func leftViewRect(forBounds bounds: CGRect) -> CGRect
var textRect = super.leftViewRect(forBounds: bounds)
textRect.origin.x += leftPadding
return textRect
@IBInspectable var leftImage: UIImage?
didSet
updateView()
@IBInspectable var leftPadding: CGFloat = 0
@IBInspectable var color: UIColor = UIColor.lightGray
didSet
updateView()
func updateView()
if let image = leftImage
leftViewMode = UITextField.ViewMode.always
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
imageView.contentMode = .scaleAspectFit
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 = color
leftView = imageView
else
leftViewMode = UITextField.ViewMode.never
leftView = nil
// Placeholder text color
attributedPlaceholder = NSAttributedString(string: placeholder != nil ? placeholder! : "", attributes:[NSAttributedString.Key.foregroundColor: color])
这里发生了什么?
这个设计允许你:
在左侧设置图像 在 UITextField 的左边缘和图像之间添加填充 设置颜色以使图像和占位符文本匹配备注
要更改图像颜色,您必须按照代码注释中的说明进行操作 故事板中的图像颜色不会改变。您必须运行项目才能在模拟器/设备中看到颜色。可在情节提要中设计
在运行时
【讨论】:
在 imageView.contentMode = .AspectFit 中添加,以避免图像大小调整。 非常感谢您的精彩帖子!我已对其进行了修改,使其也具有 RTL 选项。此处提供代码:pastebin.com/7CCm6NEB 干得好,伙计们!我后来也做了同样的事情。哈哈 图片和文字之间有什么填充? 最佳答案。【参考方案2】:尝试添加emailField.leftViewMode = UITextFieldViewMode.Always
(默认leftViewMode
是Never
)
Swift 4
的更新答案emailField.leftViewMode = UITextFieldViewMode.always
emailField.leftViewMode = .always
【讨论】:
嗯,它对我有用,你用更新后的值(UITextFieldViewMode.Always
)试过了吗?你知道是什么没用吗? (例如它编译了吗?)
这是我在'ViewWillAppear'部分的全部代码:'var imageView = UIImageView(); var image = UIImage(named: "email.png"); imageView.image = 图像; emailTextField.leftView = imageView; emailTextField.leftViewMode = UITextFieldViewMode.Always
@informatiker 好的,您确定您的连接正确吗,例如,如果您设置emailTextField
的背景颜色,它真的会改变吗?你确定图像在那里吗?例如,创建另一个 UIImageView 并在其中加载 image
以验证它是否有效。
好的,谢谢。问题是图标是白色的,在白色背景上不可见。
我继续我的搜索,终于让它工作了,我错过了为图像视图设置框架。看起来我们需要在将图像添加到 uitextfield 之前在图像上设置框架。像这样imageView1.frame = CGRect(x: 5, y: 0, width: userName.frame.height, height: userName.frame.height) view.addSubview(imageView1)
【参考方案3】:
我只是想在这里添加一些东西:
如果您想在左侧的UITextField
添加图像,请使用UITextField
的leftView
属性
注意: 不要忘记将leftViewMode
设置为UITextFieldViewMode.Always
并且正确地将rightViewMode
设置为UITextFieldViewMode.Always and
默认为UITextFieldViewModeNever
例如
用于在左侧添加图像
textField.leftViewMode = UITextFieldViewMode.Always
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
let image = UIImage(named: imageName)
imageView.image = image
textField.leftView = imageView
用于在右侧添加图像
textField.rightViewMode = UITextFieldViewMode.Always
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
let image = UIImage(named: imageName)
imageView.image = image
textField.rightView = imageView
注意:在UITextField
的左侧或右侧添加图像时需要注意一些事项。
别忘了给ImageView
一个框架,你要在UITextField
上添加它
让 imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
如果您的图片背景为白色,则图片在 UITextField
上不可见
如果要将图片添加到特定位置,则需要添加ImageView
作为UITextField
的子视图。
Swift 3.0 更新
@Mark Moeykens 巧妙地使用它并使其成为 @IBDesignable。
我在此修改并添加了更多功能(为右图添加底线和填充)。
注意如果您想在右侧添加图像,您可以在界面生成器中的semantic
中选择Force Right-to-Left
选项(但是对于正确的图像填充将不起作用,直到您将覆盖 rightViewRect 方法)。
我已经修改了这个,可以从这里下载源代码ImageTextField
【讨论】:
如何在扩展中添加它并在我的视图控制器中调用?你能推荐我吗 非常简单!只需在 UIViewController 扩展中创建函数并在调用该函数时传递 imagename 和 textfield ref。 extension UIViewController func addLeftImage(imageName: String, textField: UITextField) textField.leftViewMode = UITextFieldViewMode.Always let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 20 , height: 20)) 让 image = UIImage(named: imageName) imageView.image = image textField.leftView = imageView 并称它为 self.addLeftImage("imganame", textField: yourtextfield) 我尝试更改图标位置。但未使用此代码更改【参考方案4】:另一种方式,灵感来自以前的帖子进行扩展。
我们可以把图片放在右边或左边
extension UITextField
enum Direction
case Left
case Right
// add image to textfield
func withImage(direction: Direction, image: UIImage, colorSeparator: UIColor, colorBorder: UIColor)
let mainView = UIView(frame: CGRect(x: 0, y: 0, width: 50, height: 45))
mainView.layer.cornerRadius = 5
let view = UIView(frame: CGRect(x: 0, y: 0, width: 50, height: 45))
view.backgroundColor = .white
view.clipsToBounds = true
view.layer.cornerRadius = 5
view.layer.borderWidth = CGFloat(0.5)
view.layer.borderColor = colorBorder.cgColor
mainView.addSubview(view)
let imageView = UIImageView(image: image)
imageView.contentMode = .scaleAspectFit
imageView.frame = CGRect(x: 12.0, y: 10.0, width: 24.0, height: 24.0)
view.addSubview(imageView)
let seperatorView = UIView()
seperatorView.backgroundColor = colorSeparator
mainView.addSubview(seperatorView)
if(Direction.Left == direction) // image left
seperatorView.frame = CGRect(x: 45, y: 0, width: 5, height: 45)
self.leftViewMode = .always
self.leftView = mainView
else // image right
seperatorView.frame = CGRect(x: 0, y: 0, width: 5, height: 45)
self.rightViewMode = .always
self.rightView = mainView
self.layer.borderColor = colorBorder.cgColor
self.layer.borderWidth = CGFloat(0.5)
self.layer.cornerRadius = 5
使用:
if let myImage = UIImage(named: "my_image")
textfield.withImage(direction: .Left, image: myImage, colorSeparator: UIColor.orange, colorBorder: UIColor.black)
享受:)
【讨论】:
你成就了我的一天,我自定义了“view.backgroundColor”和“imageView.tintColor”以使其完全可定制。非常感谢您的回答 xD 这太棒了 这是最好最简单的答案【参考方案5】:为了创建填充,我喜欢将图像放置在容器视图中。一旦您对图标位置感到满意,您就可以删除背景颜色。
let imageView = UIImageView(frame: CGRect(x: 8.0, y: 8.0, width: 24.0, height: 24.0))
let image = UIImage(named: "my_icon")
imageView.image = image
imageView.contentMode = .scaleAspectFit
imageView.backgroundColor = UIColor.red
let view = UIView(frame: CGRect(x: 0, y: 0, width: 32, height: 40))
view.addSubview(imageView)
view.backgroundColor = .green
textField.leftViewMode = UITextFieldViewMode.always
textField.leftView = view
【讨论】:
谢谢。用颜色很好的解释。 最智能的方式,因为它在 uitextfield 上无需扩展即可缩短时间【参考方案6】:对于 Swift 3.0,在 textField 的左侧添加图像
textField.leftView = UIImageView(image: "small-calendar")
textField.leftView?.frame = CGRect(x: 0, y: 5, width: 20 , height:20)
textField.leftViewMode = .always
【讨论】:
【参考方案7】:斯威夫特 5
@IBOutlet weak var paswd: UITextField!
didSet
paswd.setLeftView(image: UIImage.init(named: "password")!)
paswd.tintColor = .darkGray
paswd.isSecureTextEntry = true
我已经创建了扩展
extension UITextField
func setLeftView(image: UIImage)
let iconView = UIImageView(frame: CGRect(x: 10, y: 10, width: 25, height: 25)) // set your Own size
iconView.image = image
let iconContainerView: UIView = UIView(frame: CGRect(x: 0, y: 0, width: 35, height: 45))
iconContainerView.addSubview(iconView)
leftView = iconContainerView
leftViewMode = .always
self.tintColor = .lightGray
结果
【讨论】:
【参考方案8】:2020 - 合理的解决方案
关于 Apple 的这种疯狂。
这也许是“最清晰”、最简单的方法:
首先,您必须正确移动文本。
请注意这个关键的 QA:https://***.com/a/27066764/294884
class TidyTextField: UITextField
@IBInspectable var leftImage: UIImage? = nil
@IBInspectable var leftPadding: CGFloat = 0
@IBInspectable var gapPadding: CGFloat = 0
private var textPadding: UIEdgeInsets
let p: CGFloat = leftPadding + gapPadding + (leftView?.frame.width ?? 0)
return UIEdgeInsets(top: 0, left: p, bottom: 0, right: 5)
override open func textRect(forBounds bounds: CGRect) -> CGRect
return bounds.inset(by: textPadding)
override open func placeholderRect(forBounds bounds: CGRect) -> CGRect
return bounds.inset(by: textPadding)
override open func editingRect(forBounds bounds: CGRect) -> CGRect
return bounds.inset(by: textPadding)
继续,我们现在必须制作并移动左侧图像:
override func leftViewRect(forBounds bounds: CGRect) -> CGRect
var r = super.leftViewRect(forBounds: bounds)
r.origin.x += leftPadding
return r
override func layoutSubviews()
super.layoutSubviews()
setup()
private func setup()
if let image = leftImage
if leftView != nil return // critical!
let im = UIImageView()
im.contentMode = .scaleAspectFit
im.image = image
leftViewMode = UITextField.ViewMode.always
leftView = im
else
leftViewMode = UITextField.ViewMode.never
leftView = nil
这似乎是最清晰、最可靠的方法。
【讨论】:
【参考方案9】:使用 Swift4 中的扩展,我们可以轻松地将图像放在右侧或左侧,并与 TextField 进行填充。
extension UITextField
//MARK:- Set Image on the right of text fields
func setupRightImage(imageName:String)
let imageView = UIImageView(frame: CGRect(x: 10, y: 10, width: 20, height: 20))
imageView.image = UIImage(named: imageName)
let imageContainerView: UIView = UIView(frame: CGRect(x: 0, y: 0, width: 55, height: 40))
imageContainerView.addSubview(imageView)
rightView = imageContainerView
rightViewMode = .always
self.tintColor = .lightGray
//MARK:- Set Image on left of text fields
func setupLeftImage(imageName:String)
let imageView = UIImageView(frame: CGRect(x: 10, y: 10, width: 20, height: 20))
imageView.image = UIImage(named: imageName)
let imageContainerView: UIView = UIView(frame: CGRect(x: 0, y: 0, width: 55, height: 40))
imageContainerView.addSubview(imageView)
leftView = imageContainerView
leftViewMode = .always
self.tintColor = .lightGray
使用代码作为左图设置:-
self.password_text_field.setupLeftImage(imageName: "unlock")
输出:)
【讨论】:
我认为最好的方法。不需要故事板。简单而简短。干得好! 出色的工作......【参考方案10】:我创建了一个简单的 IBDesignable。随心所欲地使用它。只需让你的 UITextField 确认这个类。
import UIKit
@IBDesignable
class RoundTextField : UITextField
@IBInspectable var cornerRadius : CGFloat = 0
didSet
layer.cornerRadius = cornerRadius
layer.masksToBounds = cornerRadius > 0
@IBInspectable var borderWidth : CGFloat = 0
didSet
layer.borderWidth = borderWidth
@IBInspectable var borderColor : UIColor?
didSet
layer.borderColor = borderColor?.cgColor
@IBInspectable var bgColor : UIColor?
didSet
backgroundColor = bgColor
@IBInspectable var leftImage : UIImage?
didSet
if let image = leftImage
leftViewMode = .always
let imageView = UIImageView(frame: CGRect(x: 20, y: 0, width: 20, height: 20))
imageView.image = image
imageView.tintColor = tintColor
let view = UIView(frame : CGRect(x: 0, y: 0, width: 25, height: 20))
view.addSubview(imageView)
leftView = view
else
leftViewMode = .never
@IBInspectable var placeholderColor : UIColor?
didSet
let rawString = attributedPlaceholder?.string != nil ? attributedPlaceholder!.string : ""
let str = NSAttributedString(string: rawString, attributes: [NSForegroundColorAttributeName : placeholderColor!])
attributedPlaceholder = str
override func textRect(forBounds bounds: CGRect) -> CGRect
return bounds.insetBy(dx: 50, dy: 5)
override func editingRect(forBounds bounds: CGRect) -> CGRect
return bounds.insetBy(dx: 50, dy: 5)
【讨论】:
【参考方案11】:另一种设置占位符图标并将填充设置为 TextField 的方法。
let userIcon = UIImage(named: "ImageName")
setPaddingWithImage(image: userIcon, textField: txtUsername)
func setPaddingWithImage(image: UIImage, textField: UITextField)
let imageView = UIImageView(image: image)
imageView.contentMode = .scaleAspectFit
let view = UIView(frame: CGRect(x: 0, y: 0, width: 60, height: 50))
imageView.frame = CGRect(x: 13.0, y: 13.0, width: 24.0, height: 24.0)
//For Setting extra padding other than Icon.
let seperatorView = UIView(frame: CGRect(x: 50, y: 0, width: 10, height: 50))
seperatorview.backgroundColor = UIColor(red: 80/255, green: 89/255, blue: 94/255, alpha: 1)
view.addSubview(seperatorView)
textField.leftViewMode = .always
view.addSubview(imageView)
view.backgroundColor = .darkGray
textField.leftViewMode = UITextFieldViewMode.always
textField.leftView = view
【讨论】:
【参考方案12】:斯威夫特 3.1
extension UITextField
enum Direction
case Left
case Right
func AddImage(direction:Direction,imageName:String,Frame:CGRect,backgroundColor:UIColor)
let View = UIView(frame: Frame)
View.backgroundColor = backgroundColor
let imageView = UIImageView(frame: Frame)
imageView.image = UIImage(named: imageName)
View.addSubview(imageView)
if Direction.Left == direction
self.leftViewMode = .always
self.leftView = View
else
self.rightViewMode = .always
self.rightView = View
【讨论】:
请添加用法和我需要传递帧参数的内容? 在此函数中的“框架”参数用于左视图或右视图【参考方案13】:您可以将此函数放在您的全局文件或您的类之上,以便您可以在整个应用程序中访问它。 完成此过程后,您可以根据应用程序的要求调用此函数。
func SetLeftSIDEImage(TextField: UITextField, ImageName: String)
let leftImageView = UIImageView()
leftImageView.contentMode = .scaleAspectFit
let leftView = UIView()
leftView.frame = CGRect(x: 20, y: 0, width: 30, height: 20)
leftImageView.frame = CGRect(x: 13, y: 0, width: 15, height: 20)
TextField.leftViewMode = .always
TextField.leftView = leftView
let image = UIImage(named: ImageName)?.withRenderingMode(.alwaysTemplate)
leftImageView.image = image
leftImageView.tintColor = UIColor(red: 106/255, green: 79/255, blue: 131/255, alpha: 1.0)
leftImageView.tintColorDidChange()
leftView.addSubview(leftImageView)
SetLeftSIDEImage(TextField: Your_textField, ImageName: “YourImageName”) // call function
【讨论】:
欢迎来到 ***,有没有什么方法可以与这段代码一起提供一些解释?仅包含代码的答案往往会因为质量低下而被删除。另请查看本指南以在帮助部分进行回答:***.com/help/how-to-answer【参考方案14】:您为什么不采用最简单的方法。在大多数情况下,您想添加像 font awesome 之类的图标...只需使用 font awesome 库,就可以像这样轻松地将图标添加到文本字段:
myTextField.setLeftViewFAIcon(icon: .FAPlus, leftViewMode: .always, textColor: .red, backgroundColor: .clear, size: nil)
您需要先安装这个 swift 库: https://github.com/Vaberer/Font-Awesome-Swift
【讨论】:
为什么要添加整个库才能获得一个字形?【参考方案15】:这是 Mark Moeykens 答案的修改版本,在图像和文本之间添加了填充,并在有人需要时可调整图像大小。
斯威夫特 4
import UIKit
@IBDesignable
class TextFieldWithImage: UITextField
override func leftViewRect(forBounds bounds: CGRect) -> CGRect
return super.leftViewRect(forBounds: bounds)
@IBInspectable var leftImage: UIImage?
didSet
updateView()
@IBInspectable var leftPadding: CGFloat = 0
didSet
updateView()
@IBInspectable var rightPadding: CGFloat = 0
didSet
updateView()
@IBInspectable var imageMaxHeight: CGFloat = 0
didSet
updateView()
@IBInspectable var color: UIColor = UIColor.lightGray
didSet
updateView()
func updateView()
if let image = leftImage
leftViewMode = UITextField.ViewMode.always
let containerSize = calculateContainerViewSize(for: image)
let containerView = UIView(frame: CGRect(x: 0, y: 0, width: containerSize.width, height: containerSize.height))
let imageView = UIImageView(frame: .zero)
containerView.addSubview(imageView)
setImageViewConstraints(imageView, in: containerView)
setImageViewProperties(imageView, image: image)
leftView = containerView
else
leftViewMode = UITextField.ViewMode.never
leftView = nil
attributedPlaceholder = NSAttributedString(string: placeholder != nil ? placeholder! : "",
attributes: [NSAttributedString.Key.foregroundColor: color])
private func calculateContainerViewSize(for image: UIImage) -> CGSize
let imageRatio = image.size.height / image.size.width
let adjustedImageMaxHeight = imageMaxHeight > self.frame.height ? self.frame.height : imageMaxHeight
var imageSize = CGSize()
if image.size.height > adjustedImageMaxHeight
imageSize.height = adjustedImageMaxHeight
imageSize.width = imageSize.height / imageRatio
let paddingWidth = leftPadding + rightPadding
let containerSize = CGSize(width: imageSize.width + paddingWidth, height: imageSize.height)
return containerSize
private func setImageViewConstraints(_ imageView: UIImageView, in containerView: UIView)
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.topAnchor.constraint(equalTo: containerView.topAnchor).isActive = true
imageView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor).isActive = true
imageView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor, constant: -rightPadding).isActive = true
imageView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor, constant: leftPadding).isActive = true
private func setImageViewProperties(_ imageView: UIImageView, image: UIImage)
imageView.contentMode = .scaleAspectFit
imageView.image = image
imageView.tintColor = color
【讨论】:
【参考方案16】:斯威夫特 5
类似于@Markus,但在 Swift 5 中:
emailTextField.leftViewMode = UITextField.ViewMode.always
emailTextField.leftViewMode = .always
【讨论】:
【参考方案17】:SwiftUI
RoundedRectangle(cornerRadius: 50)
.frame(height: 40)
.colorInvert() // sets the background white
.padding()
.shadow(radius: 12) // adds shadow to the rectangle
.overlay(
HStack(spacing: 20)
Image(systemName: "person")
.resizable()
.aspectRatio(contentMode: .fit)
TextField("Username ", text: $username)
.font(Font.custom("Arial", size: 25))
.font(.title)
.padding()
.padding()
)
Results
【讨论】:
【参考方案18】:我不认为基于框架的解决方案是一个好方法,因为在某些情况下它在 iPad 上不可用。 理想的解决方案是将 imageView 的约束添加到文本字段右视图,但这并不容易。除非需要,否则右视图似乎不在文本字段视图层次结构中,因此您需要执行以下操作:
private let countryTextField: UITextField =
let countryTextField = UITextField()
countryTextField.translatesAutoresizingMaskIntoConstraints = false
countryTextField.rightViewMode = .always
let button = UIButton(type: .system)
button.setImage(UIImage(named: "yourImageName"), for: .normal)
button.translatesAutoresizingMaskIntoConstraints = false
countryTextField.rightView = button
countryTextField.setNeedsLayout() //Add rightView in textField hierarchy
countryTextField.layoutIfNeeded() //Add rightView in textField hierarchy
button.topAnchor.constraint(equalTo: countryTextField.topAnchor).isActive = true
button.bottomAnchor.constraint(equalTo: countryTextField.bottomAnchor).isActive = true
button.widthAnchor.constraint(equalTo: countryTextField.heightAnchor).isActive = true
return countryTextField
()
任何设备上的结果都是:
另外,我的解决方案适用于文本字段左视图。
【讨论】:
【参考方案19】:let image = UIImage(systemName: "envelope")
let textField = UITextField()
textField.leftView = UIImageView(image: image)
textField.leftView?.frame = CGRect(x: 5, y: 5, width: 20 , height:20)
textField.leftViewMode = .always
【讨论】:
请解释一下你的答案,***.com/help/how-to-answer【参考方案20】:这是为我做的。在自定义/可重用类中。对实际文本和左视图图标/图像的黑白空间有很大帮助
func currencyLeftVeiw(image litery: UIImage)
self.leftView = UIView(frame: CGRect(x: 10, y: 0, width: 40, height: 40))
self.leftViewMode = .always
let leftViewItSelf = UIImageView(frame: CGRect(x: 10, y: 10, width: 20, height: 20))
leftViewItSelf.image = litery
leftView?.addSubview(leftViewItSelf)
【讨论】:
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