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声明的方法必须返回void(不是float)

ibaction uibutton swift ios

1

jonpeter · 技术社区 · 7 年前

@IBOutlet weak var buttonValue: UIButton!
@IBAction func smallB(_ sender: Any) -> Float {

    var inital = 2
    let divisble = 2

    var width: Float
    var height: Float



    if inital % divisble == 0
    {
        width = 0.14
        height = 0.07
        buttonValue.titleLabel?.text = "Big"
        inital + 1
    }
    else
    {
        width = 0.28
        height = 0.14
        buttonValue.titleLabel?.text = "Small"
        inital + 1
    }

    return width
    return height

}

2 回复 | 直到 7 年前

1

4

Krunal 7 年前

iAction功能可以由用户在任何UI元素(如按钮、开关、段控制器)上的交互调用。它的响应(返回类型)返回到用户界面元素,如果您使用iAction并将该操作附加到界面生成器,则可能无法在代码中获得浮点值

从您的 IBAction

@IBAction func smallB(_ sender: Any) {
   // action contents

   // also remove following return statements
   // return width
   //  return height
}

func smallBTest(_ sender: Any) -> CGSize {
   // action contents

  //Update your return statement like
  return CGSize(width: width, height: height)
}

let size: CGSize = smallBTest(<button instance > buttonValue)
print("Size: Width = \(size.width)  -- Height = \(size.Height)")

// or you can try this as well
@IBAction func smallB(_ sender: Any) {
  let size: CGSize = smallBTest(sender)
   print("Size: Width = \(size.width)  -- Height = \(size.Height)")
}

2

1

Aditya Srivastava Bishow Gurung 7 年前

@IBAction func smallB(_ sender: Any) {
 // your logic
}

并删除 return width return height .