[英]Why am I getting an “unrecognized selector sent to class” error for CIFilter?
[英]Why am I getting unrecognized selector sent to class?
我一直在尝试解决所有堆栈溢出问题,但没有一个解决方案有效。
class ToastView: UIView {
static func showInParent(parentView: UIView!, withText text: String, forDuration duration: double_t) {
//Count toast views are already showing on parent. Made to show several toasts one above another
var toastsAlreadyInParent = 0;
for view in parentView.subviews {
if (view.isKindOfClass(ToastView)) {
toastsAlreadyInParent++
}
}
var parentFrame = parentView.frame;
var yOrigin = parentFrame.size.height - getDouble(toastsAlreadyInParent)
var selfFrame = CGRectMake(parentFrame.origin.x + 20.0, yOrigin, parentFrame.size.width - 40.0, toastHeight);
var toast = ToastView(frame: selfFrame)
toast.textLabel.backgroundColor = UIColor.clearColor()
toast.textLabel.textAlignment = NSTextAlignment.Center
toast.textLabel.textColor = UIColor.whiteColor()
toast.textLabel.numberOfLines = 2
toast.textLabel.font = UIFont.systemFontOfSize(13.0)
toast.addSubview(toast.textLabel)
toast.backgroundColor = UIColor.darkGrayColor()
toast.alpha = 0.0;
toast.layer.cornerRadius = 4.0;
toast.textLabel.text = text;
parentView.addSubview(toast)
UIView.animateWithDuration(0.4, animations: {
toast.alpha = 0.9
toast.textLabel.alpha = 0.9
})
var timer = NSTimer.scheduledTimerWithTimeInterval(duration, target: self , selector: "hideSelf:", userInfo: nil, repeats: false)
//toast.performSelector(Selector("hideSelf"), withObject: nil, afterDelay: duration)
}
static private func getDouble(toastsAlreadyInParent : Int) -> CGFloat {
return (70.0 + toastHeight * CGFloat(toastsAlreadyInParent) + toastGap * CGFloat(toastsAlreadyInParent));
}
func hideSelf( timer: NSTimer) {
UIView.animateWithDuration(0.4, animations: {
self.alpha = 0.0
self.textLabel.alpha = 0.0
}, completion: { t in self.removeFromSuperview() })
}
}
这是我得到的错误:
NSInvalidArgumentException',原因:'+[HonorsApp.ToastView hideSelf:]:无法识别的选择器发送到 class 0x10b564530' *** 首先抛出调用堆栈:
我尝试将 @objc 添加到从选择器调用的方法和 class 中,但它没有用
还:
Selector("hideSelf")
将方法声明为hideSelf()
Selector("hideSelf:")
将方法声明为hideSelf( timer: NSTimer)
还检查了 class 是否继承自 NSObject,如果我没记错的话,它是通过继承自 UIView 来实现的。
我正在使用XCode 6.4
和swift 1.2
我是 swift 的编程新手,需要 android 中的 Toast function 之类的东西,我找到了这段代码,但是一旦我点击运行,错误就出现了。
我在这里先向您的帮助表示感谢。
由于showInParent
是一个static
功能, self
您使用的是NSTimer.scheduledTimerWithTimeInterval
指的是类,而不是类的实例。 如果没有查找正确的目标,iOS将不会找到实例方法hideSelf
。
尝试将您创建的ToastView
实例传递给计时器:
var timer = NSTimer.scheduledTimerWithTimeInterval(duration, target: toast, selector: "hideSelf:", userInfo: nil, repeats: false)
试试这段代码。
toast.performSelector(Selector("hideSelf:"), withObject: nil)
或
toast.performSelector(#selector(ClassName.hideSelf(_:)), withObject: nil) s
改变这一行:
var timer = NSTimer.scheduledTimerWithTimeInterval(duration, target: self , selector: "hideSelf:", userInfo: nil, repeats: false)
成:
var timer = NSTimer.scheduledTimerWithTimeInterval(duration, target: toast , selector: "hideSelf:", userInfo: nil, repeats: false)
这应该有所帮助。
我今天早些时候收到这个错误。 Xcode 建议把这个:
self' 引用 'LoginController.self' 方法,这可能是意外使用 'LoginController.self' 来消除此警告
但事实证明LoginController.self
不起作用。 这是 Xcode 中的错误
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