Question

我将UIButtons排列在水平UIScrollView中。我有我已添加到UIScrollView的contentView UIView，按钮在里面。 scrollview内容宽度比屏幕大小宽，因此一些按钮开始时不在屏幕上。当我滚动并将它们拖到屏幕上时，点击它们并不会调用它所应用的功能。另一方面，点击最初在屏幕上启动的按钮可以正常工作。在解决这个问题时会感谢一些帮助。

Answer 1

这是一个小小的工作示例，如果它有帮助：

类ViewController：UIViewController {

    @IBOutlet weak var scrollView: UIScrollView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let button1 = UIButton()
        button1.backgroundColor = UIColor.redColor()
        button1.setTitle("Button 1", forState: .Normal)
        button1.setTranslatesAutoresizingMaskIntoConstraints(false)
        self.scrollView.addSubview(button1)
        self.scrollView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-(100)-[button1(100)]", options: NSLayoutFormatOptions(0), metrics: nil, views: ["button1": button1]))
        self.scrollView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[button1(100)]", options: NSLayoutFormatOptions(0), metrics: nil, views: ["button1": button1]))
        button1.addTarget(self, action: "button1", forControlEvents: .TouchUpInside)

        let button2 = UIButton()
        button2.backgroundColor = UIColor.greenColor()
        button2.setTitle("Button 2", forState: .Normal)
        button2.setTranslatesAutoresizingMaskIntoConstraints(false)
        self.scrollView.addSubview(button2)
        self.scrollView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-(500)-[button2(100)]-(300)-|", options: NSLayoutFormatOptions(0), metrics: nil, views: ["button2": button2]))
        self.scrollView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[button2(100)]", options: NSLayoutFormatOptions(0), metrics: nil, views: ["button2": button2]))
        button2.addTarget(self, action: "button2", forControlEvents: .TouchUpInside)
    }

    func button1() {
        print("button1")
    }

    func button2() {
        print("button2")
    }
}

UIScrollView按钮点击不起作用

1 个答案: