Swift - didDeselectItemAtIndexPath返回錯誤的數據

Question

我有一個導航欄按鈕來加載從包含四個項目的底部菜單中的幻燈片。點擊其中一個菜單項將打開一個新的空白視圖。

除了一件事之外，一切都按預期工作：點擊一個菜單項目前打開一個隨機視圖，從我的視圖陣列。將indexPath打印到控制檯還顯示，在每次啓動視圖後，每次返回主屏幕時都會對數組進行洗牌。我甚至不能連續兩次點擊同一個項目（當我這樣做時沒有任何反應）。

我一直在試圖弄清楚爲什麼會發生這種情況，但我真的不知道發生了什麼事情。

爲什麼我的indexPath從我的菜單項數組中返回不正確的信息？

class Setting: NSObject { 

let name: SettingName 
let imageName: String 

init(name: SettingName, imageName: String) { 
    self.name = name 
    self.imageName = imageName 
} 
} 

// Set list of items for menu 
enum SettingName: String { 
case Cancel = "Cancel" 
case PostNews = "Post News" 
case CheckLog = "Student Activity" 
case AddStudent = "Add Student" 
} 

class MenuLauncher: NSObject, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout { 

let blackView = UIView() 

let collectionView: UICollectionView = { 
    let layout = UICollectionViewFlowLayout() 
    let cv = UICollectionView(frame: .zero, collectionViewLayout: layout) 
    cv.backgroundColor = UIColor.whiteColor() 
    return cv 
}() 

let cellId = "cellId" 
let cellHeight: CGFloat = 50 

let settings: [Setting] = { 
    let newsSetting = Setting(name: .PostNews, imageName: "menu_postnews") 
    let cancelSetting = Setting(name: .Cancel, imageName: "menu_cancel") 

    return [newsSetting, Setting(name: .CheckLog, imageName: "menu_log"), 
      Setting(name: .AddStudent, imageName: "menu_addstudent"), cancelSetting] 
}() 

var homeController: NewsController? 

// Load menu 
func openMenu() { 

    if let window = UIApplication.sharedApplication().keyWindow { 

     blackView.backgroundColor = UIColor(white: 0, alpha: 0.5) 
     blackView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleDismiss))) 

     window.addSubview(blackView) 
     window.addSubview(collectionView) 

     let height: CGFloat = CGFloat(settings.count) * cellHeight 
     let y = window.frame.height - height 
     collectionView.frame = CGRectMake(0, window.frame.height, window.frame.width, height) 

     blackView.frame = window.frame 
     blackView.alpha = 0 

     UIView.animateWithDuration(0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .CurveEaseOut, animations: { 

      self.blackView.alpha = 1 
      self.collectionView.frame = CGRectMake(0, y, self.collectionView.frame.width, self.collectionView.frame.height) 

      }, completion: nil) 
    } 
} 

// Dismiss menu when user touches the screen 
func handleDismiss(setting: Setting) { 
    UIView.animateWithDuration(0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .CurveEaseOut, animations: { 

     self.blackView.alpha = 0 

     if let window = UIApplication.sharedApplication().keyWindow { 
      self.collectionView.frame = CGRectMake(0, window.frame.height, 
       self.collectionView.frame.width, 
       self.collectionView.frame.height) 
     } 

    }) { (completed: Bool) in 
     if setting.name != .Cancel { 
      self.homeController?.showControllerForSetting(setting) 
     } 
    } 
} 

// Fill in the menu with all the items 
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 
    return settings.count 
} 

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell 
{ 
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier(cellId, forIndexPath: indexPath) as! MenuCell 

    let setting = settings[indexPath.item] 
    cell.setting = setting 

    return cell 
} 

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize { 
    return CGSizeMake(collectionView.frame.width, cellHeight) 
} 

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAtIndex section: Int) -> CGFloat { 
    return 0 
} 

func collectionView(collectionView: UICollectionView, didDeselectItemAtIndexPath indexPath: NSIndexPath) { 

    let setting = self.settings[indexPath.item] 
    handleDismiss(setting) 
    print(setting.name) // Is indexPath correct? 
} 

override init() { 
    super.init() 

    collectionView.dataSource = self 
    collectionView.delegate = self 
    collectionView.registerClass(MenuCell.self, forCellWithReuseIdentifier: cellId) 
} 
} 

Answer 1

由於科坦帕爾馬，並提到庵埠KARTHIK：我選擇了不正確的函數參數。我莫名其妙地寫了didDeselectItemAtIndexPath而不是didSelectItemAtIndexPath。提醒您在實施新功能時仔細檢查您的代碼。多謝你們！

我的代碼

func collectionView(collectionView: UICollectionView, didDeselectItemAtIndexPath indexPath: NSIndexPath) { 

let setting = self.settings[indexPath.item] 
handleDismiss(setting) 
print(setting.name) // Is indexPath correct? 

}

正確的代碼

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) { 

let setting = self.settings[indexPath.item] 
handleDismiss(setting) 
print(setting.name) // Is indexPath correct? 

}