我知道很多次都会问这个问题，但没有一个解决方案对我有用。
我有一个自定义的UIView类，用于显示警报消息。我添加了UIButton来关闭视图。但是，当我选中它时没有任何反应。
import UIKit
public class Alert: UIView {
public var image: UIImage?
public var title: String?
public var message: String?
public var closeButtonText: String?
public var dialogBackgroundColor: UIColor = .white
public var dialogTitleTextColor: UIColor = .black
public var dialogMessageTextColor: UIColor = UIColor(red: 0.2, green: 0.2, blue: 0.2, alpha: 1)
public var dialogImageColor: UIColor = UIColor(red:0.47, green:0.72, blue:0.35, alpha:1.0)
public var overlayColor: UIColor = .black
public var overlayOpacity: CGFloat = 0.66
public var paddingSingleTextOnly: CGFloat = 8
public var paddingTopAndBottom: CGFloat = 24
public var paddingFromSides: CGFloat = 8
public var seperatorHeight: CGFloat = 6
private var height: CGFloat = 0
private var width: CGFloat = 0
private var maxSize: CGSize = CGSize()
private let marginFromSides: CGFloat = 80
public lazy var imageSize: CGSize = CGSize(width: 75, height: 75)
public var overlay = false
public var blurOverlay = true
//animation duration
public var duration = 0.33
private var onComplete: (() -> Void)?
@objc public var titleFont: UIFont = UIFont.systemFont(ofSize: 18)
@objc public var messageFont: UIFont = UIFont.systemFont(ofSize: 15)
private lazy var backgroundView: UIView = {
let view = UIView()
view.alpha = 0
return view
}()
public let dialogView: UIView = {
let view = UIView()
view.layer.cornerRadius = 6
view.layer.masksToBounds = true
view.alpha = 0
view.clipsToBounds = true
return view
}()
private lazy var imageView: UIImageView = {
let view = UIImageView()
view.contentMode = .scaleAspectFit
return view
}()
public lazy var closeButton: UIButton = {
let button = UIButton()
return button
}()
private lazy var titleLabel: UILabel = {
let label = UILabel()
label.numberOfLines = 0
label.textAlignment = .center
return label
}()
private lazy var messageLabel: UILabel = {
let label = UILabel()
label.numberOfLines = 0
label.textAlignment = .center
return label
}()
@objc func closeButtonTapped(sender: UIButton){
dismiss()
}
private func calculations() {
height += paddingTopAndBottom
maxSize = CGSize(width: frame.width - marginFromSides * 2, height: frame.height - marginFromSides)
}
public convenience init(title:String, message: String, image:UIImage) {
self.init(frame: UIScreen.main.bounds)
self.title = title
self.message = message
self.image = image
}
public convenience init(title:String, image:UIImage) {
self.init(frame: UIScreen.main.bounds)
self.title = title
self.image = image
}
public convenience init(title: String, message: String) {
self.init(frame: UIScreen.main.bounds)
self.title = title
self.message = message
}
public convenience init(message: String) {
self.init(frame: UIScreen.main.bounds)
paddingTopAndBottom = paddingSingleTextOnly
paddingFromSides = paddingSingleTextOnly * 2
self.message = message
}
override init(frame: CGRect) {
super.init(frame: frame)
}
public required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
private func createOverlay() {
backgroundView.frame = frame
backgroundView.backgroundColor = overlayColor
backgroundView.isUserInteractionEnabled = true
addSubview(backgroundView)
if let window = UIApplication.shared.keyWindow {
window.addSubview(backgroundView)
} else if let window = UIApplication.shared.delegate?.window??.rootViewController {
window.view.addSubview(self)
}
}
private func createBlurOverlay() {
backgroundView.frame = frame
//Blur Effect
let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.dark)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = frame
blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
backgroundView.addSubview(blurEffectView)
addSubview(backgroundView)
if let window = UIApplication.shared.keyWindow {
window.addSubview(backgroundView)
} else if let window = UIApplication.shared.delegate?.window??.rootViewController {
window.view.addSubview(self)
}
}
private func createTitle(title: String) {
titleLabel.font = titleFont
titleLabel.text = title
titleLabel.frame.origin.y = height + 2
let titleLabelSize = titleLabel.sizeThatFits(maxSize)
handleSize(size: titleLabelSize)
titleLabel.frame.size = titleLabelSize
titleLabel.textColor = self.dialogTitleTextColor
dialogView.addSubview(titleLabel)
}
private func createMessage(message: String) {
messageLabel.font = messageFont
messageLabel.text = message
messageLabel.frame.origin.y = height
let messageLabelSize = messageLabel.sizeThatFits(maxSize)
messageLabel.frame.size = messageLabelSize
messageLabel.textColor = self.dialogMessageTextColor
handleSize(size: messageLabelSize)
dialogView.addSubview(messageLabel)
}
private func createImage(image: UIImage) {
imageView.image = image.withRenderingMode(.alwaysTemplate)
imageView.frame.origin.y = height
imageView.frame.size = imageSize
imageView.tintColor = self.dialogImageColor
handleSize(size: imageSize)
dialogView.addSubview(imageView)
}
private func createButton(){
closeButton.setTitle("Close", for: .normal)
closeButton.tintColor = UIColor.white
closeButton.frame.origin.y = height + 20
let closeButtonSize = CGSize(width: width - 60, height: 60)
closeButton.frame.size = closeButtonSize
closeButton.layer.cornerRadius = 6
closeButton.backgroundColor = Color.NavigationBar.tintColor
closeButton.isUserInteractionEnabled = true
handleSize(size: closeButtonSize)
dialogView.addSubview(closeButton)
}
private func createDialog() {
centerAll()
height += paddingTopAndBottom
dialogView.frame.size = CGSize(width: width, height: height)
dialogView.backgroundColor = self.dialogBackgroundColor
dialogView.isUserInteractionEnabled = true
addSubview(dialogView)
self.dialogView.center = self.center
self.dialogView.transform = CGAffineTransform(scaleX: 1.15, y: 1.15)
if let window = UIApplication.shared.keyWindow {
window.addSubview(dialogView)
closeButton.addTarget(self, action: #selector(closeButtonTapped(sender:)), for: .touchUpInside)
} else if let window = UIApplication.shared.delegate?.window??.rootViewController {
UIApplication.topViewController()?.view.addSubview(self)
window.view.addSubview(self)
closeButton.addTarget(self, action: #selector(closeButtonTapped(sender:)), for: .touchUpInside)
}
}
private func centerAll() {
if ((messageLabel.text) != nil) {
messageLabel.frame.origin.x = (width - messageLabel.frame.width) / 2
}
if ((titleLabel.text) != nil) {
titleLabel.frame.origin.x = (width - titleLabel.frame.width) / 2
}
if ((imageView.image) != nil) {
imageView.frame.origin.x = (width - imageView.frame.width) / 2
}
closeButton.frame.origin.x = (width - closeButton.frame.width) / 2
}
private func handleSize(size: CGSize) {
if width < size.width + paddingFromSides * 2 {
width = size.width + paddingFromSides * 2
}
if paddingTopAndBottom != paddingSingleTextOnly {
height += seperatorHeight
}
height += size.height
}
private func showAnimation() {
UIView.animate(withDuration: duration, animations: {
if self.overlay {
self.backgroundView.alpha = self.overlayOpacity
self.dialogView.transform = CGAffineTransform(scaleX: 1, y: 1)
}
self.dialogView.alpha = 1
})
}
public func show() {
if let complete = onComplete {
self.onComplete = complete
}
calculations()
if self.overlay {
if blurOverlay {
createBlurOverlay()
} else {
createOverlay()
}
}
if let img = image {
createImage(image: img)
}
if let title = title {
createTitle(title: title)
}
if let message = message {
createMessage(message: message)
}
createButton()
createDialog()
showAnimation()
}
public func dismiss(){
UIView.animate(withDuration: duration, animations: {
if self.overlay {
self.backgroundView.alpha = 0
}
self.dialogView.transform = CGAffineTransform(scaleX: 1.15, y: 1.15)
self.dialogView.alpha = 0
}, completion: { (completed) in
self.dialogView.removeFromSuperview()
if (self.overlay)
{
self.backgroundView.removeFromSuperview()
}
self.removeFromSuperview()
if let completionHandler = self.onComplete {
completionHandler()
}
})
}
}
我如何创建警报;
let alert = Alert(title: "hata",message: "hata mesajı ekrana basıldı", image: #imageLiteral(resourceName: "error"))
alert.show()
如果我在UIViewController（我创建这个UIView的地方）中声明目标为
Alert.closeButton.addTarget(self, action: #selector(closeButtonTapped(sender:), for: .touchUPInside)
并在UIViewController中创建函数它正在工作。我无法弄清楚为什么它在自定义课程中不起作用。
所以我的问题是如何在选中按钮时关闭警报视图？
我尝试了下面的解决方案，但没有为我工作;
答案 0 :(得分：2)
假设这些行在函数内部 - 例如由于按钮点击：
@IBAction func didTap(_ sender: Any) {
let alert = Alert(title: "hata",message: "hata mesajı ekrana basıldı", image: #imageLiteral(resourceName: "error"))
alert.show()
}
您正在创建Alert类的实例，在其中调用.show()函数，然后它超出范围。
因此，只要该函数存在，alert就不再存在，并且其中没有代码可以运行。
你需要有一个类级变量来显示它：
class MyViewController: UIViewController {
var alert: Alert?
@IBAction func didTap(_ sender: Any) {
alert = Alert(title: "hata",message: "hata mesajı ekrana basıldı", image: #imageLiteral(resourceName: "error"))
alert?.show()
}
}
以下是＆＃34;错误方式＆＃34;和正确的方式＆＃34;处理您的Alert视图：https://github.com/DonMag/EmreTest
答案 1 :(得分：-1)
查看此代码
1-在UIView类中调用IBAction
import UIKit
public class Alert: UIView {
public lazy var closeButton: UIButton = {
let button = UIButton(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
button.backgroundColor = #colorLiteral(red: 0.9254902005, green: 0.2352941185, blue: 0.1019607857, alpha: 1)
return button
}()
func createDialog() {
closeButton.addTarget(self, action: #selector(self.closeButtonTapped(sender:)), for: .touchUpInside)
self.addSubview(closeButton)
}
@objc func closeButtonTapped(sender: UIButton){
print("Call 1")
}
}
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let alert = Alert(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
alert.createDialog()
self.view.addSubview(alert)
}
}
2-在UIViewController类中调用IBAction
import UIKit
public class Alert: UIView {
public lazy var closeButton: UIButton = {
let button = UIButton(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
button.backgroundColor = #colorLiteral(red: 0.9254902005, green: 0.2352941185, blue: 0.1019607857, alpha: 1)
return button
}()
func createDialog() {
// closeButton.addTarget(self, action: #selector(self.closeButtonTapped(sender:)), for: .touchUpInside)
self.addSubview(closeButton)
}
@objc func closeButtonTapped(sender: UIButton){
print("Call 1")
}
}
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let alert = Alert(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
alert.createDialog()
alert.closeButton.addTarget(self, action: #selector(self.closeButtonTappedController(_:)), for: .touchUpInside)
self.view.addSubview(alert)
}
@IBAction func closeButtonTappedController(_ sender:UIButton){
print("Call 2")
}
}
答案 2 :(得分：-2)
在自定义swift类中导入UIKit。
导入UIKit