Question

我有两个视图控制器，ViewControllerA和ViewControllerB，其中ViewControllerB是ViewControllerA的子类。以下是ViewControllerA中的代码实现。

class ViewControllerA: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    createButton()
    buttonPressed()
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()      
}

func createButton () {
    let button = UIButton();
    button.setTitle("Add", forState: .Normal)
    button.setTitleColor(UIColor.blueColor(), forState: .Normal)
    button.frame = CGRectMake(200, 65, 46, 30) // X, Y, width, height
    button.addTarget(self, action: "buttonPressed:", forControlEvents: .TouchUpInside)
    self.view.addSubview(button)
}

func buttonPressed(sender: UIButton!) {
    var alertView = UIAlertView();
    alertView.addButtonWithTitle("Done");
    alertView.title = "Alert!";
    alertView.message = "Button Pressed!!!";
    alertView.show();
}

在我的ViewControllerB中，我想使用createButton（），但不是在ViewControllerA中使用它的方式。让我们说我想在createButton（）的ViewControllerB中使用红色而不是蓝色。如何在ViewControllerB中覆盖createButton（）以使其不同？

Answer 1

以下方法可行。

class ViewControllerA: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    createButton()
    buttonPressed()
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()      
}

func createButton () {
    let button = UIButton();
    button.setTitle("Add", forState: .Normal)
    button.setTitleColor(UIColor.blueColor(), forState: .Normal)
    button.frame = CGRectMake(200, 65, 46, 30) // X, Y, width, height
    button.addTarget(self, action: "buttonPressed:", forControlEvents: .TouchUpInside)
    self.view.addSubview(button)
}

func buttonPressed(sender: UIButton!) {
    var alertView = UIAlertView();
    alertView.addButtonWithTitle("Done");
    alertView.title = "Alert!";
    alertView.message = "Button Pressed!!!";
    alertView.show();
}


class ViewControllerB: ViewControllerA {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()      
}

override func createButton () {
    let button = UIButton();
    button.setTitle("Add", forState: .Normal)
    button.setTitleColor(UIColor.blueColor(), forState: .Normal)
    button.frame = CGRectMake(200, 65, 46, 30) // X, Y, width, height
    button.addTarget(self, action: "buttonPressed:", forControlEvents: .TouchUpInside)
    self.view.addSubview(button)
}

override func buttonPressed(sender: UIButton!) {
    var alertView = UIAlertView();
    alertView.addButtonWithTitle("Done");
    alertView.title = "Alert!";
    alertView.message = "Button Pressed!!!";
    alertView.show();
}

希望能帮助那些也试图理解视图控制器子类化的最佳方式的人。

如何在ViewControllers中以编程方式添加UIButton

1 个答案: