如何基于变量检查数组内容并通过if语句调用警告窗口？Bingo应用咨询

Hey there! Let's break down your two iOS development questions and walk through solutions step by step.

1. Checking Array Content Against a Variable & Triggering Alert Windows #

To check an array based on another variable and show an alert when a condition is met, you can use Swift's array methods combined with UIAlertController. Here are common practical scenarios:

Scenario 1: Check if the array contains the target variable #

// Define your array and target variable
let targetValue = "Bingo"
let wordArray = ["Hello", "Bingo", "World"]

// Check if the array includes the target
if wordArray.contains(targetValue) {
    // Create and present the alert
    let alert = UIAlertController(
        title: "Match Found!",
        message: "The array contains your target value: \(targetValue)",
        preferredStyle: .alert
    )
    alert.addAction(UIAlertAction(title: "Got it", style: .default))
    present(alert, animated: true)
}

Scenario 2: Custom condition (e.g., elements greater than a threshold) #

If you need a more specific check (like elements meeting a criteria tied to your variable), use contains(where:):

let threshold = 10
let numberArray = [5, 12, 8, 15]

// Check if any element is above the threshold
if numberArray.contains(where: { $0 > threshold }) {
    let alert = UIAlertController(
        title: "Condition Met",
        message: "At least one element in the array is greater than \(threshold)",
        preferredStyle: .alert
    )
    alert.addAction(UIAlertAction(title: "OK", style: .cancel))
    present(alert, animated: true)
}

2. Optimizing Bingo App Logic & Implementing createAlert #

Your current win condition check works, but we can clean it up and integrate the alert functionality smoothly.

Step 1: Simplify the Win Condition Check #

Instead of chaining multiple button checks, store your buttons in an array to make the code scalable and easier to maintain:

// Store your row buttons in an array (define this at the class level)
let firstRowButtons = [BOneButton, IOneButton, NOneButton, GOneButton, OOneButton]

// Check if all buttons are selected
func checkWinCondition() {
    if firstRowButtons.allSatisfy({ $0.isSelected }) {
        winConditionLabel.text = "You win!"
        // Trigger your alert when the win condition hits
        createAlert(sender: firstRowButtons.first!)
    }
}

Step 2: Implement the createAlert Method #

Here's a complete implementation of your createAlert function, including win feedback and a restart option to reset the game:

func createAlert(_ sender: UIButton) {
    let winAlert = UIAlertController(
        title: "BINGO!",
        message: "You've scored a winning row! 🎉",
        preferredStyle: .alert
    )
    
    // Add a restart action to reset the game state
    let restartAction = UIAlertAction(title: "Restart Game", style: .default) { _ in
        // Reset all buttons to unselected state
        self.firstRowButtons.forEach { button in
            button.isSelected = false
            // Reset button image to its unselected state
            button.setImage(UIImage(named: "unselected_dot"), for: .normal)
        }
        self.winConditionLabel.text = ""
    }
    
    let okAction = UIAlertAction(title: "OK", style: .cancel)
    
    winAlert.addAction(restartAction)
    winAlert.addAction(okAction)
    
    present(winAlert, animated: true)
}

Step 3: Link Button Taps to State Updates #

Make sure your button tap handler toggles selection, swaps images, and triggers the win check every time a button is pressed:

@IBAction func bingoButtonTapped(_ sender: UIButton) {
    // Toggle the button's selected state
    sender.isSelected.toggle()
    
    // Swap images based on current selection state
    let selectedImage = UIImage(named: "selected_mark")
    let unselectedImage = UIImage(named: "unselected_dot")
    sender.setImage(sender.isSelected ? selectedImage : unselectedImage, for: .normal)
    
    // Check for win condition after every tap
    checkWinCondition()
}

内容的提问来源于stack exchange，提问作者Matthew W.