问题描述
我正在尝试快速从自定义向上滑动菜单中显示控制器，但是当我从菜单中选择一个选项时，它没有显示控制器。
起初我使用苹果警报控制器，它工作正常，但我将其更改为自定义创建的菜单，该菜单从屏幕底部滑入，如下所示：
我使用以下类来构建它：
class SettingsLauncher: NSObject,UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout {
let blackView = UIView()
let cellHeight = CGFloat(50)
let collectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
let cv = UICollectionView(frame: .zero,collectionViewLayout: layout)
cv.backgroundColor = UIColor.rgb(red: 35,green: 35,blue: 35,alpha: 1)
return cv
}()
let settings: [Setting] = {
return [
Setting(name: "Profile Settings",imageName: "gear"),Setting(name: "My Store",imageName: "bag"),Setting(name: "Search User",imageName: "magnifyingglass"),Setting(name: "Cancel",imageName: "xmark")
]
}()
override init() {
super.init()
collectionView.dataSource = self
collectionView.delegate = self
collectionView.register(SettingsCell.self,forCellWithReuseIdentifier: reuseidentifier)
}
func showSettings() {
if let window = UIApplication.shared.keyWindow {
blackView.backgroundColor = UIColor.clear
blackView.addGestureRecognizer(UITapGestureRecognizer(target: self,action: #selector(handledismiss)))
window.addSubview(blackView)
window.addSubview(collectionView)
let height: CGFloat = CGFloat(settings.count) * cellHeight + 50
let y = window.frame.height - height
collectionView.frame = CGRect(x: 0,y: window.frame.height,width: window.frame.width,height: height)
collectionView.layer.cornerRadius = 20
blackView.frame = window.frame
blackView.alpha = 0
UIView.animate(withDuration: 0.5,delay: 0,usingSpringWithdamping: 1,initialSpringVeLocity: 1,options: .curveEaSEOut) {
self.blackView.alpha = 1
self.collectionView.frame = CGRect(x: 0,y: y,width: self.collectionView.frame.width,height: self.collectionView.frame.height)
} completion: { (nil) in
}
}
}
@objc func handledismiss(setting: Setting) {
UIView.animate(withDuration: 0.5,options: .curveEaSEOut) {
self.blackView.alpha = 0
if let window = UIApplication.shared.keyWindow {
self.collectionView.frame = CGRect(x: 0,height: self.collectionView.frame.height)
}
} completion: { (nil) in
let mainTab = MainTabVC()
mainTab.presentController(setting: setting)
}
}
//MARK: - Collection View
func collectionView(_ collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int {
return settings.count
}
func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseidentifier,for: indexPath) as! SettingsCell
let setting = settings[indexPath.row]
cell.setting = setting
return cell
}
func collectionView(_ collectionView: UICollectionView,layout collectionViewLayout: UICollectionViewLayout,minimumLinespacingForSectionAt section: Int) -> CGFloat {
return 0
}
func collectionView(_ collectionView: UICollectionView,sizeforItemAt indexPath: IndexPath) -> CGSize {
let width = collectionView.frame.width
print(width)
return CGSize(width: width,height: cellHeight)
}
func collectionView(_ collectionView: UICollectionView,didSelectItemAt indexPath: IndexPath) {
let setting = self.settings[indexPath.item]
handledismiss(setting: setting)
}
}
当我选择四个项目中的一个时，菜单会被关闭，并会显示一个适当的控制器，但它不起作用。这就是我尝试这样做的方式，但我认为这是不正确的：
此函数在另一个名为 MainTabVC() 的类中处理，该类是配置所有导航栏项目的地方，当它们被按下时，它调用上面的类来显示菜单。
func presentController(setting: Setting) {
if setting.name == "Search User" {
let searchVC = SearchVC()
let navigationController = UINavigationController(rootViewController: searchVC)
navigationController.title = "Search User"
self.navigationController?.present(navigationController,animated: true,completion: nil)
} else {
print(setting.name)
}
}
当用户选择不是“选择用户”的选项时，代码会被执行并打印出每个设置的名称，但为什么不显示控制器。
任何帮助都会有所帮助，谢谢。
解决方法
当你用这种方式触发动作时
let mainTab = MainTabVC()
mainTab.presentController(setting: setting)
您实际上创建了一个从未包含在任何窗口和 MainTabVC() 方案中的新 UI。
您可以开始编写通信协议了。
protocol SettingsLauncherDelegate: class {
func settingDidSelected(setting: Setting)
}
然后在SettingsLauncher课
class SettingsLauncher: NSObject {
// add weak delegate variable
weak var delegate: SettingsLauncherDelegate?
}
func collectionView(_ collectionView: UICollectionView,didSelectItemAt indexPath: IndexPath) {
let setting = self.settings[indexPath.item]
delegate?.settingDidSelected(setting: setting)
}
然后进入你的目标 UIViewController 班
使您的视图控制器符合这样的协议。
class ViewController: UIViewController,SettingsLauncherDelegate{
let settingsLauncher = SettingsLauncher()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
settingsLauncher.delegate = self
}
// this will be triggered when any action is selected
func settingDidSelected(setting: Setting) {
print("selected setting > ",setting)
}
}
然后将自定义 UIView 类的委托变量设置为 self。
这将解决您的问题。