ios - 选择后如何获取文本按钮？

Question

您好，我正在尝试获取按钮选择后的文本。 我这样做是为了使按钮的图像和文本居中。

我创建了一个函数来帮助我做到这一点。我想在选择按钮时调用它以再次呈现大小并再次居中取决于当前文本按钮。但是当我选择时，我没有得到任何文本变化。 有人知道我该怎么做吗？

override func viewDidLoad() {
    super.viewDidLoad()

    let button: UIButton = UIButton()

    button.frame = CGRectMake(100, 100, 150, 60)

    button.setImage(UIImage(named: "img"), forState: .Normal)
    button.setImage(UIImage(named: "imgSelected"), forState: .Selected)


    button.setTitle("Test", forState: .Normal)
    button.setTitle("Prueba", forState: .Selected)

    button.setTitleColor(UIColor.lightGrayColor(), forState: .Normal)
    button.setTitleColor(UIColor.lightGrayColor(), forState: .Selected)

    button.addTarget(self, action: #selector(HistoricalViewController.buttonAction(_:)), forControlEvents: UIControlEvents.TouchUpInside)
    //Center the image with text
    setupButton(button)
    self.view.addSubview(button)
}

func buttonAction(sender:UIButton){
    let button = sender as UIButton
    if button.selected{
        button.selected = false
    }else{
        button.selected = true
    }
    print("Current title \(button.currentTitle!)")
    setupButton(button)
}

func setupButton(button: UIButton) {
    let spacing: CGFloat = 6.0
    let imageSize: CGSize = button.imageView!.image!.size
    button.titleEdgeInsets = UIEdgeInsetsMake(0.0, -imageSize.width, -(imageSize.height + spacing), 0.0);
    let labelString = NSString(string: button.titleLabel!.text!)
    print("button title \(button.titleLabel!.text!)")
    let titleSize = labelString.sizeWithAttributes([NSFontAttributeName: button.titleLabel!.font])
    button.imageEdgeInsets = UIEdgeInsetsMake(-(titleSize.height + spacing), 0.0, 0.0, -titleSize.width);
}

已编辑:

我像这样更新了我的函数，以保持图像居中

func buttonAction(sender:UIButton){
    let button = sender as UIButton
    if button.selected{
        button.selected = false
        button.setTitle("Test", forState: UIControlState.Normal)
    }else{
        button.selected = true
        button.setTitle("Prueba", forState: UIControlState.Normal)
    }
    setupButton(button)
}

和

func setupButton(button: UIButton) {
    let spacing: CGFloat = 6.0
    let imageSize: CGSize = button.imageView!.image!.size
    button.titleEdgeInsets = UIEdgeInsetsMake(0.0, -imageSize.width, -(imageSize.height + spacing), 0.0);
    let labelString = NSString(string: button.titleForState(button.selected ? .Selected : .Normal)!)
    let titleSize = labelString.sizeWithAttributes([NSFontAttributeName: button.titleLabel!.font])
    button.imageEdgeInsets = UIEdgeInsetsMake(-(titleSize.height + spacing), 0.0, 0.0, -titleSize.width);
}

Answer 1

在 setupButton 中，改变这个:

let labelString = NSString(string: button.titleForState(button.selected ? .Selected : .Normal)!)