我最近開始用 Swift 進行開發（通常是嵌入式 C 開發人員）。
我想以編程方式創建一些按鈕（后來不止一個）并更改其標簽（僅供練習）。為此，我創建了一個按鈕類，其中包含按鈕 init 和回呼函式。我的問題是它似乎#selector沒有像我預期的那樣指向按鈕類的實體，所以單擊按鈕什么也不做。你能告訴我我做錯了什么嗎？
@objc class buttontest : NSObject{
let button = NSButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
@objc func printSomething() {
print("Hello")
self.button.title="TEST13"
}
func buttoninit() -> NSButton{
self.button.title="Test"
self.button.bezelStyle=NSButton.BezelStyle.rounded
self.button.target=self;
//button.action = Selector(ViewController.printSomething)
self.button.action = #selector(self.printSomething)
return self.button
}
}
class ViewController: NSViewController {
private lazy var redBox = NSView(frame: NSRect(x: 0, y: 0, width: 100, height: 100))
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(redBox)
redBox.wantsLayer = true
redBox.layer?.backgroundColor = NSColor.red.cgColor
//button.init("Test12",self,Selector(printSomething())
let button = buttontest()
self.view.addSubview(button.buttoninit())
//self.view.addSubview(buttontest().buttoninit())
// Do any additional setup after loading the view.
}
override func loadView() {
self.view = NSView(frame: NSRect(x: 0, y: 0, width: NSScreen.main?.frame.width ?? 100, height: NSScreen.main?.frame.height ?? 100))
}
override var representedObject: Any? {
didSet {
// Update the view, if already loaded.
}
}
}
uj5u.com熱心網友回復：
確定版本：
@objc class buttontest : NSObject{
let button = NSButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
@objc func printSomething() {
print("Hello")
self.button.title="TEST13"
}
func buttoninit() -> NSButton{
self.button.title="Test"
self.button.bezelStyle=NSButton.BezelStyle.rounded
self.button.target=buttonX
self.button.action = #selector(buttontest.printSomething)
return self.button
}
}
let buttonX = buttontest()
class ViewController: NSViewController {
private lazy var redBox = NSView(frame: NSRect(x: 0, y: 0, width: 100, height: 100))
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(redBox)
redBox.wantsLayer = true
redBox.layer?.backgroundColor = NSColor.red.cgColor
self.view.addSubview(buttonX.buttoninit())
}
}
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