ios 未按下按钮时如何调用按钮功能
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How do I call a button function when the button is not being pressed
提问by nachshon fertel
I have an IBAction connected to a button, and I wanted to know if there is any way to run that function even if the button is not being pressed. This is what I tried...
我有一个连接到按钮的 IBAction，我想知道即使没有按下按钮，是否有任何方法可以运行该功能。这是我试过的...
Note: I am using swift for this project.
注意：我在这个项目中使用 swift。
//I get an error when I type this code?
self.buttonPressed()
@IBAction func buttonPressed(sender: AnyObject) {
print("Called Action")
}
回答by Satachito
Make your sender argument optional and pass nil to ButtonPressed.
使您的发件人参数可选并将 nil 传递给 ButtonPressed。
self.ButtonPressed( nil )
@IBAction func ButtonPressed( sender: AnyObject? ) {
println("Called Action")
}
回答by Chackle
One way would be to link your button up to its respective interface builder button and pass it into your function when you call it.
一种方法是将您的按钮链接到其各自的界面构建器按钮，并在您调用它时将其传递到您的函数中。
@IBOutlet weak var yourButton: UIButton!
self.buttonPressed(yourButton)
@IBAction func buttonPressed(sender: AnyObject) {
print("Called Action")
}
Alternatively, define your function like so, then you'll be able to call your method the same way as you did before:
或者，像这样定义你的函数，然后你就可以像以前一样调用你的方法：
@IBAction func buttonPressed(sender: AnyObject? = nil) {
print("Called Action")
}
// Call your method like this
self.buttonPressed()
// or this
self.buttonPressed(sender: nil)
回答by Matthew Quiros
Your ButtonPressedfunction needs an argument senderand yet you're not passing any when you call it. However, if you're doing this programatically, then you obviously don't have a sender.
您的ButtonPressed函数需要一个参数sender，但您在调用它时没有传递任何参数。但是，如果您以编程方式执行此操作，那么您显然没有sender.
Two ways to get around this:
解决这个问题的两种方法：
- Make the sender parameter an optional (
AnyObject?instead ofAnyObject) and invokeself.ButtonPress(nil). I just tried this and it works. - Put all the button press function in a separate function, e.g.,
performButtonPress(). Call it from inside the IBAction outlet, and if you want to press the button programatically, directly callperformButtonPress().
- 将 sender 参数设为可选（
AnyObject?而不是AnyObject）并调用self.ButtonPress(nil). 我刚试过这个，它的工作原理。 - 将所有按钮按下功能放在一个单独的功能中，例如，
performButtonPress()。从 IBAction outlet 内部调用它，如果你想以编程方式按下按钮，直接调用performButtonPress().
回答by Ram Madhavan
Call a button action using the following format: Swift 3
使用以下格式调用按钮操作：Swift 3
@IBAction func buttonSelected(_ sender: UIButton) {
print("Butten clicked")
}
To call the button action:
调用按钮动作：
let button = UIButton()
self.buttonSelected(button)
回答by Urvish Modi
lazy var Button : UIBarButtonItem = {
let barButtonItem = UIBarButtonItem(title: "Button", style: .done, target: self, action: #selector(btnSelection))
return barButtonItem
}()
func btnSelection(){
// Code
}
// Now you can call self.btnSelection() whenever you want
回答by ooenomel2003
You need to use "self" as "sender", example:
您需要使用“self”作为“sender”，例如：
self.buttonPressed (sender: self)
or a simpler version
或者更简单的版本
buttonPressed (sender: self)
Both tested in Swift 3
两者都在 Swift 3 中测试过
