当我启动我的代码时,我遇到了控制台错误
由于未捕获的异常'NSInvalidArgumentException'而终止应用程序,原因:' - [_ SwiftValue counter]:无法识别的选择器发送到实例
代码如下
class Status: UIViewController {
@IBOutlet var health: UIProgressView!
@IBOutlet var happiness: UIProgressView!
@IBOutlet var energy: UIProgressView!
@IBOutlet var hygiene: UIProgressView!
@IBOutlet var pain: UIProgressView!
@IBOutlet var hunger: UIProgressView!
var total:Double = 1
@objc func counter() {
total -= 0.05
}
let timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector:#selector(counter), userInfo: nil, repeats:true)
override func viewDidLoad() {
super.viewDidLoad()
hunger.setProgress(Float(total), animated: true)
happiness.setProgress(Float(total), animated: true)
energy.setProgress(Float(total), animated: true)
hygiene.setProgress(Float(total), animated: true)
pain.setProgress(Float(total), animated: true)
health.setProgress(Float(total), animated: true)
}
}
另外这里是我收到Error Message的完整错误消息的图片
当您使用这样的默认值时,self
尚未完全初始化。使用隐式展开的可选项并将调用移动到viewDidLoad
:
var timer: Timer!
override func viewDidLoad() {
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector:#selector(counter), userInfo: nil, repeats:true)
}
这假设您在视图控制器完成从nib加载之前不需要timer
,这应该是大部分时间。