如何在Swift中添加消息？

Question

有没有办法在swift中提供Toast消息？

我在目标c中尝试但在swift中找不到解决方案。

[self.view makeToast:@"Account created Successfully"
                     duration:0.5
                     position:@"bottom"];

Answer 1

extension UIViewController {

func showToast(message : String) {

    let toastLabel = UILabel(frame: CGRect(x: self.view.frame.size.width/2 - 75, y: self.view.frame.size.height-100, width: 150, height: 35))
    toastLabel.backgroundColor = UIColor.black.withAlphaComponent(0.6)
    toastLabel.textColor = UIColor.white
    toastLabel.textAlignment = .center;
    toastLabel.font = UIFont(name: "Montserrat-Light", size: 12.0)
    toastLabel.text = message
    toastLabel.alpha = 1.0
    toastLabel.layer.cornerRadius = 10;
    toastLabel.clipsToBounds  =  true
    self.view.addSubview(toastLabel)
    UIView.animate(withDuration: 4.0, delay: 0.1, options: .curveEaseOut, animations: {
         toastLabel.alpha = 0.0
    }, completion: {(isCompleted) in
        toastLabel.removeFromSuperview()
    })
} }

Answer 2

对于Swift 4

我使用布局约束的Toast版本，其优点是可以适用于任何文本大小（基于响应） Tony Franzis）：

只需致电：Toast.show(message: "My message", myViewControllerName)

class Toast {
    static func show(message: String, controller: UIViewController) {
        let toastContainer = UIView(frame: CGRect())
        toastContainer.backgroundColor = UIColor.black.withAlphaComponent(0.6)
        toastContainer.alpha = 0.0
        toastContainer.layer.cornerRadius = 25;
        toastContainer.clipsToBounds  =  true

        let toastLabel = UILabel(frame: CGRect())
        toastLabel.textColor = UIColor.white
        toastLabel.textAlignment = .center;
        toastLabel.font.withSize(12.0)
        toastLabel.text = message
        toastLabel.clipsToBounds  =  true
        toastLabel.numberOfLines = 0

        toastContainer.addSubview(toastLabel)
        controller.view.addSubview(toastContainer)

        toastLabel.translatesAutoresizingMaskIntoConstraints = false
        toastContainer.translatesAutoresizingMaskIntoConstraints = false

        let a1 = NSLayoutConstraint(item: toastLabel, attribute: .leading, relatedBy: .equal, toItem: toastContainer, attribute: .leading, multiplier: 1, constant: 15)
        let a2 = NSLayoutConstraint(item: toastLabel, attribute: .trailing, relatedBy: .equal, toItem: toastContainer, attribute: .trailing, multiplier: 1, constant: -15)
        let a3 = NSLayoutConstraint(item: toastLabel, attribute: .bottom, relatedBy: .equal, toItem: toastContainer, attribute: .bottom, multiplier: 1, constant: -15)
        let a4 = NSLayoutConstraint(item: toastLabel, attribute: .top, relatedBy: .equal, toItem: toastContainer, attribute: .top, multiplier: 1, constant: 15)
        toastContainer.addConstraints([a1, a2, a3, a4])

        let c1 = NSLayoutConstraint(item: toastContainer, attribute: .leading, relatedBy: .equal, toItem: controller.view, attribute: .leading, multiplier: 1, constant: 65)
        let c2 = NSLayoutConstraint(item: toastContainer, attribute: .trailing, relatedBy: .equal, toItem: controller.view, attribute: .trailing, multiplier: 1, constant: -65)
        let c3 = NSLayoutConstraint(item: toastContainer, attribute: .bottom, relatedBy: .equal, toItem: controller.view, attribute: .bottom, multiplier: 1, constant: -75)
        controller.view.addConstraints([c1, c2, c3])

        UIView.animate(withDuration: 0.5, delay: 0.0, options: .curveEaseIn, animations: {
            toastContainer.alpha = 1.0
        }, completion: { _ in
            UIView.animate(withDuration: 0.5, delay: 1.5, options: .curveEaseOut, animations: {
                toastContainer.alpha = 0.0
            }, completion: {_ in
                toastContainer.removeFromSuperview()
            })
        })
    }
}

Answer 3

只需添加以下方法即可。这将以动画显示不同颜色的消息（消息从左到右显示并消失）。

Swift 3.0 -

class Toast
{
    class private func showAlert(backgroundColor:UIColor, textColor:UIColor, message:String)
    {

        let appDelegate: AppDelegate = UIApplication.shared.delegate as! AppDelegate
        let label = UILabel(frame: CGRect.zero)
        label.textAlignment = NSTextAlignment.center
        label.text = message
        label.font = UIFont(name: "", size: 15)
        label.adjustsFontSizeToFitWidth = true

        label.backgroundColor =  backgroundColor //UIColor.whiteColor()
        label.textColor = textColor //TEXT COLOR

        label.sizeToFit()
        label.numberOfLines = 4
        label.layer.shadowColor = UIColor.gray.cgColor
        label.layer.shadowOffset = CGSize(width: 4, height: 3)
        label.layer.shadowOpacity = 0.3
        label.frame = CGRect(x: appDelegate.window!.frame.size.width, y: 64, width: appDelegate.window!.frame.size.width, height: 44)

        label.alpha = 1

        appDelegate.window!.addSubview(label)

        var basketTopFrame: CGRect = label.frame;
        basketTopFrame.origin.x = 0;

        UIView.animate(withDuration
            :2.0, delay: 0.0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.1, options: UIViewAnimationOptions.curveEaseOut, animations: { () -> Void in
                label.frame = basketTopFrame
        },  completion: {
            (value: Bool) in
            UIView.animate(withDuration:2.0, delay: 2.0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.1, options: UIViewAnimationOptions.curveEaseIn, animations: { () -> Void in
                label.alpha = 0
            },  completion: {
                (value: Bool) in
                label.removeFromSuperview()
            })
        })
    }

    class func showPositiveMessage(message:String)
    {
        showAlert(backgroundColor: UIColor.green, textColor: UIColor.white, message: message)
    }
    class func showNegativeMessage(message:String)
    {
        showAlert(backgroundColor: UIColor.red, textColor: UIColor.white, message: message)
    }
}

Answer 4

Swift 4

func showToast(message : String) {

    let toastLabel = UILabel(frame: CGRect(x: self.view.frame.size.width/2 - 75, y: self.view.frame.size.height-100, width: 150, height: 35))
    toastLabel.backgroundColor = UIColor.black.withAlphaComponent(0.6)
    toastLabel.textColor = UIColor.white
    toastLabel.textAlignment = .center;
    toastLabel.font = UIFont(name: "Montserrat-Light", size: 12.0)
    toastLabel.text = message
    toastLabel.alpha = 1.0
    toastLabel.layer.cornerRadius = 10;
    toastLabel.clipsToBounds  =  true
    self.view.addSubview(toastLabel)
    UIView.animate(withDuration: 4.0, delay: 0.1, options: .curveEaseOut, animations: {
        toastLabel.alpha = 0.0
    }, completion: {(isCompleted) in
        toastLabel.removeFromSuperview()
    })
}

调用函数

self.showToast(message: "Data Save.")

Answer 5

第三方库支持单行代码的可自定义Toast通知。这是一个简单的例子：

import Toast_Swift

...

// basic usage
self.view.makeToast("This is a piece of toast")

// toast with a specific duration and position
self.view.makeToast("This is a piece of toast", duration: 3.0, position: .top)

https://github.com/scalessec/Toast-Swift

（更新为Swift 3/4 +）

Answer 6

你究竟需要的是https://github.com/Rannie/Toast-Swift/blob/master/SwiftToastDemo/Toast/HRToast%2BUIView.swift。

下载HRToast + UIView.swift类并拖放到项目中。确保在对话框中选中“如果需要，复制项目”。

  //Usage:
  self.view.makeToast(message: "Simple Toast")
  self.view.makeToast(message: "Simple Toast", duration: 2.0, position:HRToastPositionTop)

  self.view.makeToast(message: "Simple Toast", duration: 2.0, position: HRToastPositionCenter, image: UIImage(named: "ic_120x120")!)

  self.view.makeToast(message: "It is just awesome", duration: 2.0, position: HRToastPositionDefault, title: "Simple Toast")

  self.view.makeToast(message: "It is just awesome", duration: 2.0, position: HRToastPositionCenter, title: "Simple Toast", image: UIImage(named: "ic_120x120")!)

  self.view.makeToastActivity()
  self.view.makeToastActivity(position: HRToastPositionCenter)
  self.view.makeToastActivity(position: HRToastPositionDefault, message: "Loading")
  self.view.makeToastActivityWithMessage(message: "Loading")

Answer 7

快速5，如果您想使用简单的烤面包，请在下面找到代码。

extension UIViewController{

func showToast(message : String, seconds: Double){
        let alert = UIAlertController(title: nil, message: message, preferredStyle: .alert)
        alert.view.backgroundColor = .black
        alert.view.alpha = 0.5
        alert.view.layer.cornerRadius = 15
        self.present(alert, animated: true)
        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + seconds) {
            alert.dismiss(animated: true)
        }
    }
 }

从UIViewController调用

  self.showToast(message: "Updating...", seconds: 1.0)

Answer 8

我一直在使用这个扩展，因为我需要toast-message像android .. 只需将扩展名复制到您的项目，然后在您的UIViewController类中，调用类似

的函数

self.toastMessage("Downloading...") 
// Extention is below

extension UIViewController {
  func toastMessage(_ message: String){
    guard let window = UIApplication.shared.keyWindow else {return}
    let messageLbl = UILabel()
    messageLbl.text = message
    messageLbl.textAlignment = .center
    messageLbl.font = UIFont.systemFont(ofSize: 12)
    messageLbl.textColor = .white
    messageLbl.backgroundColor = UIColor(white: 0, alpha: 0.5)

    let textSize:CGSize = messageLbl.intrinsicContentSize
    let labelWidth = min(textSize.width, window.frame.width - 40)

    messageLbl.frame = CGRect(x: 20, y: window.frame.height - 90, width: labelWidth + 30, height: textSize.height + 20)
    messageLbl.center.x = window.center.x
    messageLbl.layer.cornerRadius = messageLbl.frame.height/2
    messageLbl.layer.masksToBounds = true
    window.addSubview(messageLbl)

    DispatchQueue.main.asyncAfter(deadline: .now() + 1) {

    UIView.animate(withDuration: 1, animations: {
        messageLbl.alpha = 0
    }) { (_) in
        messageLbl.removeFromSuperview()
    }
    }
}}

Answer 9

如果只需要简单的Toast消息，而无需自定义字体，对齐方式，文本颜色等，那么下面的方法就可以了

let messageVC = UIAlertController(title: "Message Title", message: "Account Created successfully" , preferredStyle: .actionSheet)
present(messageVC, animated: true) {
                Timer.scheduledTimer(withTimeInterval: 0.5, repeats: false, block: { (_) in
                    messageVC.dismiss(animated: true, completion: nil)})}

.actionSheet从屏幕底部显示警报，计时器负责显示持续时间。您可以将其添加为UIViewController的扩展，然后从任何地方调用它。

Answer 10

如果在objective-c中定义了makeToast:duration:position:并且可以调用，那么swift代码将是

self.view.makeToast("Acount created Successfully", duration: 0.5, position: "bottom")

您可能需要使用bridging header来访问swift代码中的这些方法。

Answer 11

@mr-bean代码更新到最新的Swift版本（3.x）

    let toastLabel =
        UILabel(frame:
            CGRect(x: self.view.frame.size.width/2 - 150,
                   y: self.view.frame.size.height-100,
                   width: 300,
                   height: 35))
    toastLabel.backgroundColor = UIColor.black
    toastLabel.textColor = UIColor.white
    toastLabel.textAlignment = NSTextAlignment.center
    self.view.addSubview(toastLabel)
    toastLabel.text = message
    toastLabel.alpha = 1.0
    toastLabel.layer.cornerRadius = 10;
    toastLabel.clipsToBounds  =  true
    UIView.animate(withDuration: 4.0, animations: {
        toastLabel.alpha = 0.0
    })

Answer 12

我知道有接受的答案，但它们似乎都有一个很大的缺陷 - 如果你在很短的时间内展示几个祝酒词，它们就会显示出来。以下是我的实现，它考虑了这个问题：

class Toast: UILabel {

private let BOTTOM_MARGIN: CGFloat = 16
private let SIDE_MARGIN: CGFloat = 16
private let HEIGHT: CGFloat = 35
private let SHOW_TIME_SECONDS = TimeInterval(3)
private let BACKGROUND_COLOR = UIColor.darkGray.withAlphaComponent(0.7).cgColor
private let TEXT_COLOR = UIColor.white
private let ANIMATION_DURATION_SEC = 0.33

private static var queue: [ToastHolder] = []
private static var showing: Toast?

init(_ text: String) {
    super.init(frame: CGRect(x: 0, y: 0, width: 0, height: 0))

    self.text = text
    self.textColor = TEXT_COLOR
    textAlignment = .center
    self.layer.backgroundColor = BACKGROUND_COLOR
    self.layer.cornerRadius = 5
}

public func show(_ parent: UIViewController) {
    frame = CGRect(x: SIDE_MARGIN, y: UIScreen.main.bounds.height - BOTTOM_MARGIN - HEIGHT, width: UIScreen.main.bounds.width - 2 * SIDE_MARGIN, height: HEIGHT)

    if Toast.showing == nil {
        Log.d("showing \(String(describing: text))")
        Toast.showing = self
        alpha = 0
        parent.view.addSubview(self)
        UIView.animate(withDuration: ANIMATION_DURATION_SEC, animations: {
            self.alpha = 1
        }, completion: { (completed) in
            Timer.scheduledTimer(timeInterval: self.SHOW_TIME_SECONDS, target: self, selector: #selector(self.onTimeout), userInfo: nil, repeats: false)
        })
    } else {
        Toast.queue.append(ToastHolder(self, parent))
    }
}

@objc func onTimeout() {        
    UIView.animate(withDuration: ANIMATION_DURATION_SEC, animations: {
        self.alpha = 0
    }, completion: { (completed) in
        Toast.showing = nil
        self.removeFromSuperview()

        if !Toast.queue.isEmpty {
            let holder = Toast.queue.removeFirst()
            holder.toast.show(holder.parent)
        }
    })
}

required init?(coder aDecoder: NSCoder) {
    fatalError("this initializer is not supported")
}

private class ToastHolder {
    let toast: Toast
    let parent: UIViewController

    init(_ t: Toast, _ p: UIViewController) {
        toast = t
        parent = p
    }
}
}

用法：

Toast("my message").show(self)

希望它有所帮助。

Answer 13

而不是使用UILabel使用UITextView获得更好的结果。

func showToast(message: String) {
        let toastLabel = UITextView(frame: CGRect(x: self.view.frame.size.width/16, y: self.view.frame.size.height-150, width: self.view.frame.size.width * 7/8, height: 35))
        toastLabel.backgroundColor = UIColor.black.withAlphaComponent(0.6)
        toastLabel.textColor = UIColor.white
        toastLabel.textAlignment = .center;
        toastLabel.text = "   \(message)   "
        toastLabel.alpha = 1.0
        toastLabel.layer.cornerRadius = 10;
        toastLabel.clipsToBounds  =  true
        toastLabel.font = UIFont(name: (toastLabel.font?.fontName)!, size: 16)
        toastLabel.layoutEdgeInsets.left = 8
        toastLabel.layoutEdgeInsets.right = 8
        toastLabel.center.x = self.view.frame.size.width/2
        self.view.addSubview(toastLabel)
        UIView.animate(withDuration: 5.0, delay: 0.1, options: .curveEaseOut, animations: {
            toastLabel.alpha = 0.0
        }, completion: {(isCompleted) in
            toastLabel.removeFromSuperview()
        })
}

添加空格以留言以在两端提供良好的间距，使其看起来很好。 Mr.Bean

的答案的修改版本

Answer 14

static func popUp(context ctx: UIViewController, msg: String) {

    let toast = UILabel(frame:
        CGRect(x: 16, y: ctx.view.frame.size.height / 2,
               width: ctx.view.frame.size.width - 32, height: 100))

    toast.backgroundColor = UIColor.lightGray
    toast.textColor = UIColor.white
    toast.textAlignment = .center;
    toast.numberOfLines = 3
    toast.font = UIFont.systemFont(ofSize: 20)
    toast.layer.cornerRadius = 12;
    toast.clipsToBounds  =  true

    toast.text = msg

    ctx.view.addSubview(toast)

    UIView.animate(withDuration: 5.0, delay: 0.2,
        options: .curveEaseOut, animations: {
        toast.alpha = 0.0
        }, completion: {(isCompleted) in
            toast.removeFromSuperview()
    })
}

然后从UIViewController

中调用它

popUp(context: self, msg: "Your message")

Answer 15

让我将其添加到此答案链中：该库满足您的需求DCToastView，可让您从屏幕顶部或底部提供吐司消息：

您只需要添加广告连播

pod 'DCToastView'

将其导入您要使用的位置。

import DCToastView

并使用它

ToastPresenter.shared.show(in: self.view, message: "This is a toast")

您可以将以下属性传递给show方法：

• 视图：将要呈现烤面包的视图
• 消息：吐司将显示的消息
• toastPlace ：可以是.down或.up
的地方
• backgroundColor ：烤面包的背景颜色；默认为黑色
• textColor ：邮件的文本颜色；默认为白色
• 超时：如果没有提供烤面包，则将其解散的秒数，这意味着烤面包将变得发粘（直到触摸为止）；默认为nil
• 圆度：烤面包的圆度：.none，.low，.mid，.high；默认为.mid

Answer 16

这对您有帮助，它将以适当的填充使吐司面包居中

func showToast(message:String,view:UIView){
    let toastLabel = PaddingLabel()
    toastLabel.frame = CGRect(x:0, y: view.frame.size.height-100, width: view.frame.width-50, height: 0)
    toastLabel.backgroundColor = UIColor.black.withAlphaComponent(0.6)
    toastLabel.textColor = UIColor.white
    toastLabel.textAlignment = .center;
    toastLabel.font = UIFont(name: "Montserrat-Light", size: 12.0)
    toastLabel.text = message
    toastLabel.alpha = 1.0
    toastLabel.layer.cornerRadius = 10;
    toastLabel.clipsToBounds  =  true
    toastLabel.sizeToFit()
    toastLabel.frame.origin.x=(view.frame.width/2)-(toastLabel.frame.width/2)
    view.addSubview(toastLabel)
    UIView.animate(withDuration: 4.0, delay: 0.1, options: .curveEaseOut, animations: {
        toastLabel.alpha = 0.0
    }, completion: {(isCompleted) in
        toastLabel.removeFromSuperview()
    })
}

并添加此PaddingLabel文件进​​行标签填充

import Foundation
import UIKit
class PaddingLabel: UILabel {

let padding=UIEdgeInsetsMake(5, 10, 5,10)
override func drawText(in rect: CGRect) {
    super.drawText(in: UIEdgeInsetsInsetRect(rect, padding))
}
override func sizeThatFits(_ size: CGSize) -> CGSize {
    let superSizeThatFits=super.sizeThatFits(size)
    let width=superSizeThatFits.width+padding.left+padding.right
    let height=superSizeThatFits.height+padding.top+padding.bottom
    return CGSize(width: width, height: height)
}
}

Answer 17

在Swift 5上，我还有两个解决方案：

最佳解决方案（我认为）

优势：

1. 旋转屏幕时可以正常工作。
2. 约束用于定位。
3. 可以与SafeArea一起正常使用。

缺点：

1. 需要扩展UILabel类以添加缩进。可以通过将UILabel放在UIVIew中来做到这一点。

代码：

class ToastLabel: UILabel {
    var textInsets = UIEdgeInsets.zero {
        didSet { invalidateIntrinsicContentSize() }
    }

    override func textRect(forBounds bounds: CGRect, limitedToNumberOfLines numberOfLines: Int) -> CGRect {
        let insetRect = bounds.inset(by: textInsets)
        let textRect = super.textRect(forBounds: insetRect, limitedToNumberOfLines: numberOfLines)
        let invertedInsets = UIEdgeInsets(top: -textInsets.top, left: -textInsets.left, bottom: -textInsets.bottom, right: -textInsets.right)

        return textRect.inset(by: invertedInsets)
    }

    override func drawText(in rect: CGRect) {
        super.drawText(in: rect.inset(by: textInsets))
    }
}

extension UIViewController {
    static let DELAY_SHORT = 1.5
    static let DELAY_LONG = 3.0

    func showToast(_ text: String, delay: TimeInterval = DELAY_LONG) {
        let label = ToastLabel()
        label.backgroundColor = UIColor(white: 0, alpha: 0.5)
        label.textColor = .white
        label.textAlignment = .center
        label.font = UIFont.systemFont(ofSize: 15)
        label.alpha = 0
        label.text = text
        label.clipsToBounds = true
        label.layer.cornerRadius = 20
        label.numberOfLines = 0
        label.textInsets = UIEdgeInsets(top: 10, left: 15, bottom: 10, right: 15)
        label.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(label)

        let saveArea = view.safeAreaLayoutGuide
        label.centerXAnchor.constraint(equalTo: saveArea.centerXAnchor, constant: 0).isActive = true
        label.leadingAnchor.constraint(greaterThanOrEqualTo: saveArea.leadingAnchor, constant: 15).isActive = true
        label.trailingAnchor.constraint(lessThanOrEqualTo: saveArea.trailingAnchor, constant: -15).isActive = true
        label.bottomAnchor.constraint(equalTo: saveArea.bottomAnchor, constant: -30).isActive = true

        UIView.animate(withDuration: 0.5, delay: 0, options: .curveEaseIn, animations: {
            label.alpha = 1
        }, completion: { _ in
            UIView.animate(withDuration: 0.5, delay: delay, options: .curveEaseOut, animations: {
                label.alpha = 0
            }, completion: {_ in
                label.removeFromSuperview()
            })
        })
    }
}

使用方法：

class MyController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        showToast("Message")
    }
}

其他解决方案

优势：

1. 在此版本中，我不使用绑定到UIViewController

缺点：

1. 旋转屏幕后，标签不会移动。
2. 不适用于多行字符串。

代码：

class Helper {
    static let DELAY_SHORT = 1.5
    static let DELAY_LONG = 3.0

    static func showToast(_ text: String, delay: TimeInterval = DELAY_LONG) {
        guard let window = UIApplication.shared.keyWindow else {
            return
        }

        let label = BaseLabel()
        label.backgroundColor = UIColor(white: 0, alpha: 0.5)
        label.textColor = .white
        label.textAlignment = .center
        label.font = UIFont.systemFont(ofSize: 15)
        label.alpha = 0
        label.text = text
        label.numberOfLines = 0

        var vertical: CGFloat = 0
        var size = label.intrinsicContentSize
        var width = min(size.width, window.frame.width - 60)
        if width != size.width {
            vertical = 10
            label.textAlignment = .justified
        }
        label.textInsets = UIEdgeInsets(top: vertical, left: 15, bottom: vertical, right: 15)

        size = label.intrinsicContentSize
        width = min(size.width, window.frame.width - 60)

        label.frame = CGRect(x: 20, y: window.frame.height - 90, width: width, height: size.height + 20)
        label.center.x = window.center.x
        label.layer.cornerRadius = min(label.frame.height/2, 25)
        label.layer.masksToBounds = true
        window.addSubview(label)

        UIView.animate(withDuration: 0.5, delay: 0, options: .curveEaseIn, animations: {
            label.alpha = 1
        }, completion: { _ in
            UIView.animate(withDuration: 0.5, delay: delay, options: .curveEaseOut, animations: {
                label.alpha = 0
            }, completion: {_ in
                label.removeFromSuperview()
            })
        })
    }
}

使用方法：

Helper.showToast("Message")

Answer 18

先生。豆子的答案很好。但是，他的答案宽度较小，并且不是多行友好的。改用它。

func showToastFaded(message : String) {


    let toastLabel = UILabel(frame: CGRect(x: self.view.frame.size.width/2 - 125, y: self.view.frame.size.height-100, width: 250, height: 35))
    toastLabel.numberOfLines = 0
    toastLabel.backgroundColor = UIColor.black.withAlphaComponent(0.6)
    toastLabel.textColor = UIColor.white
    toastLabel.textAlignment = .center;
    toastLabel.text = message
    toastLabel.alpha = 1.0
    toastLabel.layer.cornerRadius = 10;
    toastLabel.clipsToBounds  =  true
    toastLabel.sizeToFit()
    toastLabel.frame = CGRect( x: toastLabel.frame.minX, y: toastLabel.frame.minY,width:   toastLabel.frame.width + 20, height: toastLabel.frame.height + 8)

    self.view.addSubview(toastLabel)
    UIView.animate(withDuration: 4.0, delay: 0.1, options: .curveEaseOut, animations: {
        toastLabel.alpha = 0.0
    }, completion: {(isCompleted) in
        toastLabel.removeFromSuperview()
    })
}

Answer 19

我用以下方法修改了@samo的答案：

•   

  正确的变量名称

•   

  前导和尾随约束更改为中心约束。

现在，消息将根据消息调整其宽度并居中。

extension UIViewController {
        func showToast(message: String) {
            let toastContainer = UIView(frame: CGRect())
            toastContainer.backgroundColor = UIColor.black.withAlphaComponent(0.6)
            toastContainer.alpha = 0.0
            toastContainer.layer.cornerRadius = 20;
            toastContainer.clipsToBounds  =  true

            let toastLabel = UILabel(frame: CGRect())
            toastLabel.textColor = UIColor.white
            toastLabel.textAlignment = .center;
            toastLabel.font.withSize(12.0)
            toastLabel.text = message
            toastLabel.clipsToBounds  =  true
            toastLabel.numberOfLines = 0

            toastContainer.addSubview(toastLabel)
            self.view.addSubview(toastContainer)

            toastLabel.translatesAutoresizingMaskIntoConstraints = false
            toastContainer.translatesAutoresizingMaskIntoConstraints = false

            let centerX = NSLayoutConstraint(item: toastLabel, attribute: .centerX, relatedBy: .equal, toItem: toastContainer, attribute: .centerXWithinMargins, multiplier: 1, constant: 0)
            let lableBottom = NSLayoutConstraint(item: toastLabel, attribute: .bottom, relatedBy: .equal, toItem: toastContainer, attribute: .bottom, multiplier: 1, constant: -15)
            let lableTop = NSLayoutConstraint(item: toastLabel, attribute: .top, relatedBy: .equal, toItem: toastContainer, attribute: .top, multiplier: 1, constant: 15)
            toastContainer.addConstraints([centerX, lableBottom, lableTop])

            let containerCenterX = NSLayoutConstraint(item: toastContainer, attribute: .centerX, relatedBy: .equal, toItem: self.view, attribute: .centerX, multiplier: 1, constant: 0)
            let containerTrailing = NSLayoutConstraint(item: toastContainer, attribute: .width, relatedBy: .equal, toItem: toastLabel, attribute: .width, multiplier: 1.1, constant: 0)
            let containerBottom = NSLayoutConstraint(item: toastContainer, attribute: .bottom, relatedBy: .equal, toItem: self.view, attribute: .bottom, multiplier: 1, constant: -75)
            self.view.addConstraints([containerCenterX,containerTrailing, containerBottom])

            UIView.animate(withDuration: 0.5, delay: 0.0, options: .curveEaseIn, animations: {
                toastContainer.alpha = 1.0
            }, completion: { _ in
                UIView.animate(withDuration: 0.5, delay: 1.5, options: .curveEaseOut, animations: {
                    toastContainer.alpha = 0.0
                }, completion: {_ in
                    toastContainer.removeFromSuperview()
                })
            })
        }
    }

Answer 20

如何使用Toaster

概览

Toast(text: "Hello, world!").show()

设置延迟和持续时间

Toast(text: "Hello, world!", duration: Delay.long)
Toast(text: "Hello, world!", delay: Delay.short, duration: Delay.long)

除吐司

let toast = Toast(text: "Hello")
toast.show()
toast.cancel() // remove toast immediately

自定义外观

• backgroundColor
• cornerRadius
• textInsets
• textColor
• 字体
• bottomOffsetPortrait
• bottomOffsetLandscape
• shadowPath
• shadowColor
• shadowOpacity
• shadowOffset
• shadowRadius
• maxWidthRatio
• useSafeAreaForBottomOffset

Answer 21

您可以创建自己的烤面包风格，并将其与整个屏幕的中心对齐，如下所示：

func showToast(message: String, in viewController: UIViewController) {
        let toastContainer: UIView = {
            let view = UIView(frame: CGRect())
            view.translatesAutoresizingMaskIntoConstraints = false
            view.backgroundColor = UIColor.gray
            view.alpha = 0.0
            view.layer.cornerRadius = 12
            view.clipsToBounds = true
            return view
        }()
        let toastLabel: UILabel = {
            let label = UILabel()
            label.translatesAutoresizingMaskIntoConstraints = false
            label.text = message
            label.textColor = UIColor.white
            label.textAlignment = .center
            label.font = label.font.withSize(20)
            label.clipsToBounds = true
            label.numberOfLines = 0
            return label
        }()

        toastContainer.addSubview(toastLabel)
        viewController.view.addSubview(toastContainer)

        toastContainer.layer.zPosition = 1

        NSLayoutConstraint.activate([
            toastContainer.widthAnchor.constraint(equalToConstant: viewController.view.frame.width * 0.6),
            toastContainer.heightAnchor.constraint(equalToConstant: viewController.view.frame.height * 0.1),
            toastContainer.centerXAnchor.constraint(equalTo: viewController.view.centerXAnchor),
            toastContainer.bottomAnchor.constraint(equalTo: viewController.view.bottomAnchor, constant:
                -UIScreen.main.bounds.maxY / 2 + viewController.view.frame.height * 0.1 / 2
            ),

            toastLabel.centerXAnchor.constraint(equalTo: toastContainer.centerXAnchor),
            toastLabel.centerYAnchor.constraint(equalTo: toastContainer.centerYAnchor)
        ])

        UIView.animate(withDuration: 0.5, delay: 0.0, options: .curveEaseIn, animations: {
            toastContainer.alpha = 1.0
        }) { (_) in
            UIView.animate(withDuration: 0.5, delay: 2, options: .curveEaseOut, animations: {
                toastContainer.alpha = 0.0
            }) { (_) in
                toastContainer.removeFromSuperview()
            }
        }
    }

Answer 22

在 iOS 应用上添加 Toast 的最佳和最简单的方法是使用这个名为 Loafjet 的库。该库非常小（27kb），不会对您的项目产生太大影响。试试吧！

Answer 23

Swift 4.2非常简单和超级方式

let toastLabel = UILabel()

toastLabel.lineBreakMode = .byWordWrapping
toastLabel.numberOfLines = 0
toastLabel.text = "Type your message you want to show in toast"
toastLabel.sizeToFit()
//MARK Resize the Label Frame
toastLabel.frame = CGRect(x: toastLabel.frame.origin.x, y: toastLabel.frame.origin.y, width: toastLabel.frame.size.width + 40, height: toastLabel.frame.size.height + 40)
self.view.addSubview(toastLabel)