带有 swift 的自定义警报(UIAlertView)

问题描述 投票:0回答:5

如何使用 Swift 创建自定义警报?我尝试翻译来自 Objective c 的指南,但加载了全屏布局

为了简单,我可以加载带有透明背景的新布局我试试这个:

listaalertviewcontroller.view.backgroundColor = UIColor.clearColor()
let purple = UIColor.purpleColor() // 1.0 alpha
let semi = purple.colorWithAlphaComponent(0.5)

listaalertviewcontroller.view.backgroundColor = semi

presentingViewController.modalPresentationStyle = UIModalPresentationStyle.CurrentContext
self.presentViewController(listaalertviewcontroller, animated: true, completion: nil)

在动画中它是透明的但是当动画结束时它是不透明的......我在视图中关闭不透明选项......我做错了什么?

ios swift uialertview
5个回答
56
投票

代码在 Swift 5 和 Xcode 10 中测试

如何制作您自己的自定义警报

我想做类似的事情。首先,

UIAlertView
被弃用,取而代之的是
UIAlertController
。有关显示警报的标准方式,请参阅此答案:

UIAlertView
UIAlertController
都不允许太多定制。一种选择是使用一些第三方代码。但是,我发现通过模态显示另一个视图控制器来创建自己的警报并不难。

这里的例子只是一个概念验证。您可以按照自己的方式设计警报。

故事板

你应该有两个视图控制器。您的第二个视图控制器将是您的警报。将班级名称设置为

AlertViewContoller
,将情节提要ID设置为
alert
。 (这两个都是我们在下面的代码中自己定义的名字,没有什么特别的,如果你想的话,你可以先添加代码。如果你先添加代码,实际上可能会更容易。)

将根视图(在您的警报视图控制器中)的背景颜色设置为清除(或者半透明的黑色适合警报)。添加另一个

UIView
并在约束条件下将其居中。将其用作您的警报背景,并将您想要的任何内容放入其中。对于我的示例,我添加了一个
UIButton
.

代码

ViewController.swift

import UIKit
class ViewController: UIViewController {

    @IBAction func showAlertButtonTapped(_ sender: UIButton) {
        
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let myAlert = storyboard.instantiateViewController(withIdentifier: "alert")
        myAlert.modalPresentationStyle = UIModalPresentationStyle.overCurrentContext
        myAlert.modalTransitionStyle = UIModalTransitionStyle.crossDissolve
        self.present(myAlert, animated: true, completion: nil)
    }
}

AlertViewController.swift

import UIKit
class AlertViewController: UIViewController {
    
    @IBAction func dismissButtonTapped(_ sender: UIButton) {
        self.dismiss(animated: true, completion: nil)
    }
}

别忘了连接插座。

您可以将

onTouchUp
事件侦听器添加到背景视图,以在用户单击它的外部时关闭弹出窗口。

就是这样。您应该能够发出您现在可以想象的任何类型的警报。无需第三方代码。

这是我制作的另一个自定义警报。仍然很丑陋,但它显示了您可以做的更多事情。

其他选择

不过,有时不需要重新发明轮子。第三方项目 SDCAlertView(MIT 许可)给我留下了深刻的印象。它是用 Swift 编写的,但您也可以将它用于 Objective-C 项目。它提供了广泛的可定制性。


18
投票

这里是Swift 3代码。非常感谢@Suragch 提供了创建自定义 AlertView 的绝妙方法。

ViewController.swift

import UIKit
class ViewController: UIViewController {

@IBAction func showAlertButtonTapped(sender: UIButton) {

        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let myAlert = storyboard.instantiateViewController(withIdentifier: "storyboardID")
        myAlert.modalPresentationStyle = UIModalPresentationStyle.overCurrentContext
        myAlert.modalTransitionStyle = UIModalTransitionStyle.crossDissolve
        self.present(myAlert, animated: true, completion: nil)

}

AlertViewController.swift

import UIKit
class AlertViewController: UIViewController {

    @IBAction func dismissButtonTapped(sender: UIButton) {
        self.dismiss(animated: true, completion: nil)
    }
}

为了让它更有趣一点或在 iOS 中制作默认效果,您可以添加一个 VisualEffectView 或将主 UIView 的颜色更改为深色并将其 alpha 设置为 70%。我更喜欢第二种方法,因为模糊效果不如 70 alpha 的视图平滑。

VisualEffectView的效果:

使用带有 70 Alpha 的 UIView 的效果:


4
投票

如今,警报只是一个简单的呈现视图控制器。您可以编写一个呈现的视图控制器,它的行为类似于警报——也就是说,它会弹出到屏幕上并使它后面的任何东西变暗——但它是your 视图控制器,您可以自由地给它任何你喜欢的界面。

为了让你开始,我写了一个github项目,你可以下载并运行,并根据你的实际需要进行修改。

我将展示代码的关键部分。 “警报”视图控制器在其初始化程序中将其自己的模态呈现样式设置为

custom
并设置一个转换委托:

class CustomAlertViewController : UIViewController {
    let transitioner = CAVTransitioner()

    override init(nibName: String?, bundle: Bundle?) {
        super.init(nibName: nibName, bundle: bundle)
        self.modalPresentationStyle = .custom
        self.transitioningDelegate = self.transitioner
    }

    convenience init() {
        self.init(nibName:nil, bundle:nil)
    }

    required init?(coder: NSCoder) {
        fatalError("NSCoding not supported")
    }
}

所有工作都由过渡代表完成:

class CAVTransitioner : NSObject, UIViewControllerTransitioningDelegate {
    func presentationController(
        forPresented presented: UIViewController,
        presenting: UIViewController?,
        source: UIViewController)
        -> UIPresentationController? {
            return MyPresentationController(
                presentedViewController: presented, presenting: presenting)
    }
}

class MyPresentationController : UIPresentationController {

    func decorateView(_ v:UIView) {
        // iOS 8 doesn't have this
//        v.layer.borderColor = UIColor.blue.cgColor
//        v.layer.borderWidth = 2
        v.layer.cornerRadius = 8

        let m1 = UIInterpolatingMotionEffect(
            keyPath:"center.x", type:.tiltAlongHorizontalAxis)
        m1.maximumRelativeValue = 10.0
        m1.minimumRelativeValue = -10.0
        let m2 = UIInterpolatingMotionEffect(
            keyPath:"center.y", type:.tiltAlongVerticalAxis)
        m2.maximumRelativeValue = 10.0
        m2.minimumRelativeValue = -10.0
        let g = UIMotionEffectGroup()
        g.motionEffects = [m1,m2]
        v.addMotionEffect(g)
    }

    override func presentationTransitionWillBegin() {
        self.decorateView(self.presentedView!)
        let vc = self.presentingViewController
        let v = vc.view!
        let con = self.containerView!
        let shadow = UIView(frame:con.bounds)
        shadow.backgroundColor = UIColor(white:0, alpha:0.4)
        shadow.alpha = 0
        con.insertSubview(shadow, at: 0)
        shadow.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        let tc = vc.transitionCoordinator!
        tc.animate(alongsideTransition: { _ in
            shadow.alpha = 1
        }) { _ in
            v.tintAdjustmentMode = .dimmed
        }
    }

    override func dismissalTransitionWillBegin() {
        let vc = self.presentingViewController
        let v = vc.view!
        let con = self.containerView!
        let shadow = con.subviews[0]
        let tc = vc.transitionCoordinator!
        tc.animate(alongsideTransition: { _ in
            shadow.alpha = 0
        }) { _ in
            v.tintAdjustmentMode = .automatic
        }
    }

    override var frameOfPresentedViewInContainerView : CGRect {
        // we want to center the presented view at its "native" size
        // I can think of a lot of ways to do this,
        // but here we just assume that it *is* its native size
        let v = self.presentedView!
        let con = self.containerView!
        v.center = CGPoint(x: con.bounds.midX, y: con.bounds.midY)
        return v.frame.integral
    }

    override func containerViewWillLayoutSubviews() {
        // deal with future rotation
        // again, I can think of more than one approach
        let v = self.presentedView!
        v.autoresizingMask = [
            .flexibleTopMargin, .flexibleBottomMargin,
            .flexibleLeftMargin, .flexibleRightMargin
        ]
        v.translatesAutoresizingMaskIntoConstraints = true
    }

}

extension CAVTransitioner { // UIViewControllerTransitioningDelegate
    func animationController(
        forPresented presented:UIViewController,
        presenting: UIViewController,
        source: UIViewController)
        -> UIViewControllerAnimatedTransitioning? {
            return self
    }

    func animationController(
        forDismissed dismissed: UIViewController)
        -> UIViewControllerAnimatedTransitioning? {
            return self
    }
}

extension CAVTransitioner : UIViewControllerAnimatedTransitioning {
    func transitionDuration(
        using transitionContext: UIViewControllerContextTransitioning?)
        -> TimeInterval {
            return 0.25
    }

    func animateTransition(
        using transitionContext: UIViewControllerContextTransitioning) {

        let con = transitionContext.containerView

        let v1 = transitionContext.view(forKey: .from)
        let v2 = transitionContext.view(forKey: .to)

        // we are using the same object (self) as animation controller
        // for both presentation and dismissal
        // so we have to distinguish the two cases

        if let v2 = v2 { // presenting
            con.addSubview(v2)
            let scale = CGAffineTransform(scaleX: 1.6, y: 1.6)
            v2.transform = scale
            v2.alpha = 0
            UIView.animate(withDuration: 0.25, animations: {
                v2.alpha = 1
                v2.transform = .identity
            }) { _ in
                transitionContext.completeTransition(true)
            }
        } else if let v1 = v1 { // dismissing
            UIView.animate(withDuration: 0.25, animations: {
                v1.alpha = 0
            }) { _ in
                transitionContext.completeTransition(true)
            }
        }

    }
}

它看起来像很多代码,我想是的,但它几乎完全局限于一个类,完全是样板;只需复制和粘贴。 所要做的就是编写“警报”视图控制器的内部界面和行为,为其提供按钮和文本以及您想要的任何其他内容,就像您为任何其他视图控制器所做的那样。


1
投票

swift 4 中的自定义警报 UIView 类。和用法 ##

import UIKit


    class Dialouge: UIView {
    @IBOutlet weak var lblTitle: UILabel!
    @IBOutlet weak var lblDescription: UILabel!
    @IBOutlet weak var btnLeft: UIButton!
    @IBOutlet weak var btnRight: UIButton!
    @IBOutlet weak var viewBg: UIButton!

    var leftAction  = {}
    var rightAction  = {}


    override func draw(_ rect: CGRect)
    {

        self.btnRight.layer.cornerRadius = self.btnRight.frame.height/2
        self.btnLeft.layer.cornerRadius = self.btnLeft.frame.height/2
        self.btnLeft.layer.borderWidth = 1.0
        self.btnLeft.layer.borderColor = #colorLiteral(red: 0.267678082, green: 0.2990377247, blue: 0.7881471515, alpha: 1)
    }
    @IBAction func leftAction(_ sender: Any) {

        leftAction()
    }

    @IBAction func rightAction(_ sender: Any) {
        rightAction()
    }
    @IBAction func bgTapped(_ sender: Any) {
        self.removeFromSuperview()
    }
    }

强文
## 使用 Tabbar 自定义警报.

    let custView = Bundle.main.loadNibNamed("Dialouge", owner: self, options: 
     nil)![0] as? Dialouge
        custView?.lblDescription.text = "Are you sure you want to delete post?"
        custView?.lblTitle.text = "Delete Post"
        custView?.btnLeft.setTitle("Yes", for: .normal)
        custView?.btnRight.setTitle("No", for: .normal)
        custView?.leftAction = {
            self.deletePost(postId: self.curr_post.id,completion: {
                custView?.removeFromSuperview()
            })
        }
        custView?.rightAction = {
            custView?.removeFromSuperview()
        }
        if let tbc = self.parentt?.tabBarController {
            custView?.frame = tbc.view.frame
            DispatchQueue.main.async {
                tbc.view.addSubview(custView!)
            }
        }else if let tbc = self.parView?.parenttprof {
            custView?.frame = tbc.view.frame
            DispatchQueue.main.async {
                tbc.view.addSubview(custView!)
            }
        }
        else
        {
            custView?.frame = self.parView?.view.frame ?? CGRect.zero
            DispatchQueue.main.async {
                self.parView?.view.addSubview(custView!)
            }
            }

-1
投票

使用https://github.com/shantaramk/Custom-Alert-View

实现起来毫不费力。请按照以下步骤操作:

  1. 在工程目录下拖拽AlertView文件夹

  2. 显示警报视图弹出窗口

func showUpdateProfilePopup(_ message: String) {
    let alertView = AlertView(title: AlertMessage.success, message: message, okButtonText: LocalizedStrings.okay, cancelButtonText: "") { (_, button) in
            if button == .other {
                self.navigationController?.popViewController(animated: true)
        }
    }
    alertView.show(animated: true)
}


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