当用户点击按钮时,它会更改UserDefaults以更改启用暗模式的背景颜色。但我希望当用户点击我的按钮时,颜色变化过渡实时发生,就像Twitter应用程序所做的那样,而不必每次都重新打开应用程序。有什么方法可以做到吗?
这是按钮的代码:
@IBAction func changeState(_ sender: UIButton) {
let isDarkMode = UserDefaults.standard.bool(forKey: "isDarkMode")
if isDarkMode == true {
UserDefaults.standard.set(false, forKey: "isDarkMode") // Set the state
}else{
UserDefaults.standard.set(true, forKey: "isDarkMode") // Set the state
}
}
这是我用来更新UI颜色的代码:
override func viewDidLoad() {
super.viewDidLoad()
let isDarkMode = UserDefaults.standard.bool(forKey: "isDarkMode") // Retrieve the state
if isDarkMode == false{
self.navigationController?.navigationBar.isTranslucent = false
self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]//user global variable
self.navigationController?.navigationBar.barStyle = UIBarStyle.default //user global variable
self.navigationController?.navigationBar.tintColor = UIColor.white //user global variable
UIApplication.shared.statusBarStyle = .default
appVersionLabel.textColor = UIColor.black
lightModeLabel.isHidden = true
self.tabBarController?.tabBar.barTintColor = UIColor.black
settingsView.backgroundColor = UIColor.white
darkModeButton.setImage(UIImage(named: "darkModeDisableButton")?.withRenderingMode(.alwaysOriginal), for: .normal)
}else{
UIApplication.shared.statusBarStyle = .lightContent
self.navigationController?.navigationBar.isTranslucent = false
self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]//user global variable
self.navigationController?.navigationBar.barStyle = UIBarStyle.default //user global variable
self.navigationController?.navigationBar.tintColor = UIColor.white //user global variable
UIApplication.shared.statusBarStyle = .lightContent
appVersionLabel.textColor = UIColor.white
darkModeLabel.isHidden = true
self.tabBarController?.tabBar.barTintColor = UIColor.black
settingsView.backgroundColor = UIColor(red: 35/255, green: 35/255, blue: 35/255, alpha: 1)
darkModeButton.setImage(UIImage(named: "darkModeEnableButton")?.withRenderingMode(.alwaysOriginal), for: .normal)
}
在函数中隔离主题代码:
func changeMode(mode: Bool) {
let bar = self.navigationController?.navigationBar
if mode == false {
bar?.isTranslucent = false
bar?.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]//user global variable
bar?.barStyle = UIBarStyle.default //user global variable
bar?.tintColor = UIColor.white //user global variable
UIApplication.shared.statusBarStyle = .default
appVersionLabel.textColor = UIColor.black
lightModeLabel.isHidden = true
self.tabBarController?.tabBar.barTintColor = UIColor.black
settingsView.backgroundColor = UIColor.white
darkModeButton.setImage(UIImage(named: "darkModeDisableButton")?.withRenderingMode(.alwaysOriginal), for: .normal)
} else {
UIApplication.shared.statusBarStyle = .lightContent
bar?.isTranslucent = false
bar?.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]//user global variable
bar?.barStyle = UIBarStyle.default //user global variable
bar?.tintColor = UIColor.white //user global variable
UIApplication.shared.statusBarStyle = .lightContent
appVersionLabel.textColor = UIColor.white
darkModeLabel.isHidden = true
self.tabBarController?.tabBar.barTintColor = UIColor.black
settingsView.backgroundColor = UIColor(red: 35/255, green: 35/255, blue: 35/255, alpha: 1)
darkModeButton.setImage(UIImage(named: "darkModeEnableButton")?.withRenderingMode(.alwaysOriginal), for: .normal)
}
}
你的viewDidLoad()
看起来像这样:
override func viewDidLoad() {
super.viewDidLoad()
let isDarkMode = UserDefaults.standard.bool(forKey: "isDarkMode") // Retrieve the state
changeMode(mode: isDarkMode)
}
和你的IBAction:
@IBAction func changeState(_ sender: UIButton) {
let isDarkMode = UserDefaults.standard.bool(forKey: "isDarkMode")
//Pointed out by rmaddy
UserDefaults.standard.set(!isDarkMode, forKey: "isDarkMode")
changeMode(mode: !isDarkMode)
}