我有一个结构,有时,对于某些用户,在尝试访问该类型的变量时会出现崩溃.
struct AppSettings {
var mute:Bool {
didSet {
if mute != oldValue {
let savedSettings = NSUserDefaults.standardUserDefaults()
savedSettings.setBool(mute,forKey: KEY_SETTING_MUTE)
}
}
}
init() {
let savedSettings = NSUserDefaults.standardUserDefaults()
if let savedMute = savedSettings.objectForKey(KEY_SETTING_MUTE) as? Bool {
mute = savedMute
} else {
mute = false
}
}
}
var appSettings = AppSettings()
在应用程序启动期间的某个地方,它有时会崩溃
if appSettings.mute { // This will sometimes cause a crash
} // in AppDelegate or the methods it calls
这仅适用于某些用户,我似乎无法重现它.不是重现它是最糟糕的,因为它让我没有任何工作.
我更改了代码的某些部分并执行它.一切都很好,没有崩溃.
原文链接：https://www.f2er.com/swift/319333.htmlstruct AppSettings {
var mute:Bool {
didSet {
if mute != oldValue {
let savedSettings = UserDefaults.standard
savedSettings.set(mute,forKey: "MUTE")
}
}
}
init() {
let savedSettings = UserDefaults.standard
if let savedMute = savedSettings.object(forKey: "MUTE") as? Bool {
mute = savedMute
} else {
mute = false
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
var appSettings = AppSettings()
if appSettings.mute {
print("It is mute ...")
}
}
