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我得到一个索引超出界限的错误，但我不明白为什么。代码编译正常，但出现错误在以下行（动画）：UIView动画方法的索引超出界限错误
import UIKit
class MenuViewController: UIViewController {
private let contentView = UIView()
private let logoView = UIImageView()
private let buttonView = UIView()
private var gameButtons = [RoundedButton]()
private let scoreView = UIView()
private let titleLabel = UILabel()
private let recentScoreLabel = UILabel()
private let highscoreLabel = UILabel()
private let titles = [
"Multiple Choice",
"Image Quiz",
"Right or wrong",
"Emoji Riddle"
]
private var recentScores = [Int]()
private var highscores = [Int]()
private var scoreIndex = 0
private var timer = Timer()
private var midXConstraints: [NSLayoutConstraint]!
private var leftConstraints: [NSLayoutConstraint]!
private var rightConstraints: [NSLayoutConstraint]!
override func viewDidLoad() {
super.viewDidLoad()
navigationController?.navigationBar.barStyle = .blackTranslucent
navigationController?.navigationBar.tintColor = UIColor.white
view.backgroundColor = UIColor(red: 41/255, green: 128/255, blue: 185/255, alpha: 1.0)
layoutView()
}
override func viewWillAppear(_ animated: Bool) {
navigationController?.navigationBar.isHidden = true
}
func updateScores() {
recentScores = [
UserDefaults.standard.integer(forKey: multipleChoiceRecentscoreIdentifier),
UserDefaults.standard.integer(forKey: imageQuizRecentscoreIdentifier),
UserDefaults.standard.integer(forKey: rightWrongRecentscoreIdentifier),
UserDefaults.standard.integer(forKey: emojiRecentscoreIdentifier)
]
highscores = [
UserDefaults.standard.integer(forKey: multipleChoiceHighScoreIdentifier),
UserDefaults.standard.integer(forKey: imageQuizHighScoreIdentifier),
UserDefaults.standard.integer(forKey: rightWrongHighscoreIdentifier),
UserDefaults.standard.integer(forKey: emojiHighscoreIdentifier)
]
}
func layoutView() {
contentView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(contentView)
logoView.translatesAutoresizingMaskIntoConstraints = false
contentView.addSubview(logoView)
logoView.image = UIImage(named: "logo")
buttonView.translatesAutoresizingMaskIntoConstraints = false
contentView.addSubview(buttonView)
for (index,title) in titles.enumerated() {
let button = RoundedButton()
button.translatesAutoresizingMaskIntoConstraints = false
buttonView.addSubview(button)
button.backgroundColor = UIColor(red: 52/255, green: 152/255, blue: 219/255, alpha: 1.0)
button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 20)
button.setTitle(title, for: .normal)
button.tag = index
gameButtons.append(button)
}
scoreView.translatesAutoresizingMaskIntoConstraints = false
contentView.addSubview(scoreView)
titleLabel.translatesAutoresizingMaskIntoConstraints = false
recentScoreLabel.translatesAutoresizingMaskIntoConstraints = false
highscoreLabel.translatesAutoresizingMaskIntoConstraints = false
scoreView.addSubview(titleLabel)
scoreView.addSubview(recentScoreLabel)
scoreView.addSubview(highscoreLabel)
titleLabel.textAlignment = .center
titleLabel.font = UIFont.boldSystemFont(ofSize: 30)
titleLabel.textColor = UIColor.white
recentScoreLabel.textColor = UIColor.white
highscoreLabel.font = UIFont.boldSystemFont(ofSize: 20)
highscoreLabel.textColor = UIColor.white
titleLabel.text = titles[scoreIndex]
recentScoreLabel.text = "Recent: " + String(UserDefaults.standard.integer(forKey: multipleChoiceRecentscoreIdentifier))
highscoreLabel.text = "Highscore: " + String(UserDefaults.standard.integer(forKey: multipleChoiceHighScoreIdentifier))
let constraints = [
contentView.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: 8.0),
contentView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
contentView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
contentView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
logoView.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 20.0),
logoView.widthAnchor.constraint(equalTo: contentView.widthAnchor, multiplier: 0.6),
logoView.centerXAnchor.constraint(equalTo: contentView.centerXAnchor),
logoView.heightAnchor.constraint(equalTo: contentView.heightAnchor, multiplier: 0.2),
buttonView.topAnchor.constraint(equalTo: logoView.bottomAnchor, constant: 20.0),
buttonView.bottomAnchor.constraint(equalTo: scoreView.topAnchor, constant: -20.0),
buttonView.widthAnchor.constraint(equalTo: contentView.widthAnchor, multiplier: 0.6),
buttonView.centerXAnchor.constraint(equalTo: contentView.centerXAnchor),
gameButtons[0].topAnchor.constraint(equalTo: buttonView.topAnchor, constant: 8.0),
gameButtons[0].bottomAnchor.constraint(equalTo: gameButtons[1].topAnchor, constant: -8.0),
gameButtons[0].leadingAnchor.constraint(equalTo: buttonView.leadingAnchor),
gameButtons[0].trailingAnchor.constraint(equalTo: buttonView.trailingAnchor),
gameButtons[1].bottomAnchor.constraint(equalTo: gameButtons[2].topAnchor, constant: -8.0),
gameButtons[1].leadingAnchor.constraint(equalTo: buttonView.leadingAnchor),
gameButtons[1].trailingAnchor.constraint(equalTo: buttonView.trailingAnchor),
gameButtons[2].bottomAnchor.constraint(equalTo: gameButtons[3].topAnchor, constant: -8.0),
gameButtons[2].leadingAnchor.constraint(equalTo: buttonView.leadingAnchor),
gameButtons[2].trailingAnchor.constraint(equalTo: buttonView.trailingAnchor),
gameButtons[3].bottomAnchor.constraint(equalTo: buttonView.bottomAnchor, constant: -8.0),
gameButtons[3].leadingAnchor.constraint(equalTo: buttonView.leadingAnchor),
gameButtons[3].trailingAnchor.constraint(equalTo: buttonView.trailingAnchor),
gameButtons[0].heightAnchor.constraint(equalTo: gameButtons[1].heightAnchor),
gameButtons[1].heightAnchor.constraint(equalTo: gameButtons[2].heightAnchor),
gameButtons[2].heightAnchor.constraint(equalTo: gameButtons[3].heightAnchor),
scoreView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -40.0),
scoreView.widthAnchor.constraint(equalTo: contentView.widthAnchor, multiplier: 0.6),
scoreView.heightAnchor.constraint(equalTo: contentView.heightAnchor, multiplier: 0.3),
titleLabel.topAnchor.constraint(equalTo: scoreView.topAnchor, constant: 8.0),
titleLabel.leadingAnchor.constraint(equalTo: scoreView.leadingAnchor),
titleLabel.trailingAnchor.constraint(equalTo: scoreView.trailingAnchor),
titleLabel.bottomAnchor.constraint(equalTo: recentScoreLabel.topAnchor, constant: -8.0),
recentScoreLabel.leadingAnchor.constraint(equalTo: scoreView.leadingAnchor),
recentScoreLabel.trailingAnchor.constraint(equalTo: scoreView.trailingAnchor),
recentScoreLabel.bottomAnchor.constraint(equalTo: highscoreLabel.topAnchor, constant: -8.0),
highscoreLabel.leadingAnchor.constraint(equalTo: scoreView.leadingAnchor),
highscoreLabel.trailingAnchor.constraint(equalTo: scoreView.trailingAnchor),
highscoreLabel.bottomAnchor.constraint(equalTo: scoreView.bottomAnchor, constant: -8.0),
titleLabel.heightAnchor.constraint(equalTo: recentScoreLabel.heightAnchor),
recentScoreLabel.heightAnchor.constraint(equalTo: highscoreLabel.heightAnchor)
]
midXConstraints = [scoreView.centerXAnchor.constraint(equalTo: contentView.centerXAnchor)]
leftConstraints = [scoreView.trailingAnchor.constraint(equalTo: contentView.leadingAnchor)]
rightConstraints = [scoreView.leadingAnchor.constraint(equalTo: contentView.trailingAnchor)]
NSLayoutConstraint.activate(constraints)
NSLayoutConstraint.activate(midXConstraints)
timer = Timer.scheduledTimer(timeInterval: 3.0, target: self, selector: #selector(nextScores), userInfo: nil, repeats: true)
}
func nextScores() {
scoreIndex = scoreIndex < (recentScores.count - 1) ? scoreIndex + 1 : 0
UIView.animate(withDuration: 1.0, animations: {
NSLayoutConstraint.deactivate(self.midXConstraints)
NSLayoutConstraint.activate(self.leftConstraints)
self.view.layoutIfNeeded()
}) {(completion: Bool) in
self.titleLabel.text = self.titles[self.scoreIndex]
self.recentScoreLabel.text = "Recent: " + String(self.recentScores[self.scoreIndex]) //Index out of bounds error appears here
self.highscoreLabel.text = "Highscore: " + String(self.highscores[self.scoreIndex])
NSLayoutConstraint.deactivate(self.leftConstraints)
NSLayoutConstraint.activate(self.rightConstraints)
self.view.layoutIfNeeded()
UIView.animate(withDuration: 1.0, animations: {
NSLayoutConstraint.deactivate(self.rightConstraints)
NSLayoutConstraint.activate(self.midXConstraints)
self.view.layoutIfNeeded()
})
}
}
}
错误告诉你问题是什么。为什么不记录你的调用索引和self.recentscores上的可用最大索引来简单地看到你正在调用一个outofbound索引？ – 2017-09-04 21:58:25