Question

我已经制作了像这样的UIButtons的集合

@IBOutlet var btnChannle1:UIButton!
@IBOutlet var btnChannle2:UIButton!
@IBOutlet var btnChannle3:UIButton!
@IBOutlet var btnChannle4:UIButton!
@IBOutlet var btnChannle5:UIButton!
@IBOutlet var btnChannle6:UIButton!
@IBOutlet var btnChannle7:UIButton!
@IBOutlet var btnChannle8:UIButton!
@IBOutlet var channlesCollection:Array<UIView>!

override func viewDidLoad() {
    super.viewDidLoad()

    channlesCollection.append(btnChannle1)
    channlesCollection.append(btnChannle2)
    channlesCollection.append(btnChannle3)
    channlesCollection.append(btnChannle4)
    channlesCollection.append(btnChannle5)
    channlesCollection.append(btnChannle6)
    channlesCollection.append(btnChannle7)
    channlesCollection.append(btnChannle8)
}

现在我想遍历上面的集合并想要这样的东西

for item in channlesCollection{
        // Set Button Text Line to 2
        // Set Button Text Like this in two line
        /*

        01
        CNN

        02
        BBC

        03
        PTV ...

                */

    }

但是当我尝试这样的时候。

for item in channlesCollection{
        item.setTitle("Test", forState: UIControlState.Normal)
    }

错误引发UIView没有名为setTitle的成员。

Answer 1

您需要将项目输入为UIButton。这是代码：

for item in  channlesCollection{
   var button:UIButton = item as UIButton
   button.setTitle("Test", forState: UIControlState.Normal)
 }

Answer 2

您拥有UIView数组，但他们确实没有setTitle方法。您可以创建UIButton类型的集合。或者将当前的收藏项目投射到按钮：

for item in channlesCollection {
    if var button = item as? UIButton {
        button.setTitle("Test", forState: UIControlState.Normal)
    }
}

Answer 3

UIView没有成员函数setTitle，但UIButton有，这可能是您想要的。

您已将channlesCollection声明为UIView的数组，为什么不将其作为UIButton的数组？

var channlesCollection: [UIButton]!

在swift中设置循环中UI按钮的标题

3 个答案: