Ios WatchKit中WKInterfaceButton的隐藏状态
有没有办法检查WatchKit中WKInterfaceButton的当前隐藏状态?看起来您无法这样做。但您可以使用state存储自己的变量并使用它 在下面,您可以检查按钮父类的定义Ios WatchKit中WKInterfaceButton的隐藏状态,ios,swift,watchos-2,Ios,Swift,Watchos 2,有没有办法检查WatchKit中WKInterfaceButton的当前隐藏状态?看起来您无法这样做。但您可以使用state存储自己的变量并使用它 在下面,您可以检查按钮父类的定义 public class WKInterfaceObject : NSObject { public func setHidden(hidden: Bool) public func setAlpha(alpha: CGFloat) @available(watchOS 2.0, *)
public class WKInterfaceObject : NSObject {
public func setHidden(hidden: Bool)
public func setAlpha(alpha: CGFloat)
@available(watchOS 2.0, *)
public func setHorizontalAlignment(horizontalAlignment: WKInterfaceObjectHorizontalAlignment)
@available(watchOS 2.0, *)
public func setVerticalAlignment(verticalAlignment: WKInterfaceObjectVerticalAlignment)
public func setWidth(width: CGFloat)
public func setHeight(height: CGFloat)
@available(watchOS 2.0, *)
public func setRelativeWidth(width: CGFloat, withAdjustment adjustment: CGFloat)
@available(watchOS 2.0, *)
public func setRelativeHeight(height: CGFloat, withAdjustment adjustment: CGFloat)
@available(watchOS 2.0, *)
public func sizeToFitWidth()
@available(watchOS 2.0, *)
public func sizeToFitHeight()
public var interfaceProperty: String { get } // same as controller's property name
}
WKInterfaceButton
类从WKInterfaceObject
类继承了一个名为“可用于显示/隐藏按钮”的方法,并且可以使用辅助变量以编程方式设置WKInterfaceButton
的状态
类似于以下示例:
class InterfaceController: WKInterfaceController {
@IBOutlet var button: WKInterfaceButton!
var buttonIsHidden: Bool!
override func awakeWithContext(context: AnyObject?) {
self.changeStatusOfButton(true)
}
private func changeStatusOfButton(status: Bool) {
// set programmatically the status of the button to hide/show
self.activityButton.setHidden(status)
// save the current status
self.buttonIsHidden = status
}
private func showButtonAgain() {
self.changeStatusOfButton(false)
}
}
当您想知道按钮是否隐藏/显示时,只需检查变量buttonishiden
我希望这对您有所帮助。正如前面的回答所述,您必须维护自己的变量,以跟踪组、标签、按钮等是否隐藏。一种简单而优雅的方法是使用属性观察者声明跟踪变量,如下所示:
@IBOutlet weak var btnChange: WKInterfaceButton!
@IBOutlet weak var lblPending: WKInterfaceLabel!
@IBOutlet weak var lblConfirmed: WKInterfaceLabel!
// Property observers. Set initial values to match storyboard / initial setup
var btnChangeIsHidden = false {didSet{btnChange.setHidden(btnChangeIsHidden)}}
var lblPendingIsHidden = true {didSet{lblPending.setHidden(lblPendingIsHidden)}}
var lblConfirmedIsHidden = true {didSet{lblConfirmed.setHidden(lblConfirmedIsHidden)}}
我们使用了一个强大的命名约定,因此跟踪变量分配给哪个对象总是显而易见的。一旦您声明了您的变量和观察者,那么在代码中您只会引用跟踪变量。您可以查询它们的当前状态并指定新状态,因为出于所有目的,它们都可以被视为对象的属性。例如
if !self.lblPendingIsHidden {
// In a pending state; reset to status before attempted change
// Toggle button / label
self.btnChangeIsHidden = !self.btnChangeIsHidden
self.lblPendingIsHidden = !self.lblPendingIsHidden
} else {
// Change was applied
self.btnChangeIsHidden = false
self.lblConfirmedIsHidden = true
}
我们在跟踪变量末尾添加“IsHidden”的惯例也使我们更容易在iOS和WatchOS之间移动代码,因为所需的更改很容易找到和进行。谢谢!我试试看。