问题描述
我在我的应用程序中使用了 gm stepper，它对应于标签.我有 4 个不同的标签和一个用于添加到 values 的附加标签.对应于 GM Steppers 的标签工作良好，但我在标签的附加值方面遇到了困难.
I use gm stepper in my app and , it corresponding to labels. I have 4 different labels and one additional label for addition to values . The labels which corresponding to GM Steppers working well but ı stumble in addition values of labels.
class ViewController: UIViewController {
@IBAction func gmstp1(_ sender: GMStepper) {
label1.text = String(sender.value*1.5)
label6.text = String(sender.value)
}
@IBOutlet weak var label1: UILabel!
@IBAction func gmstp2(_ sender: GMStepper) {
label2.text = String(sender.value*0.89)
}
@IBOutlet weak var label2: UILabel!
@IBAction func gmstp3(_ sender: GMStepper) {
label3.text = String(sender.value*26)
}
@IBOutlet weak var label3: UILabel!
@IBAction func gmstp4(_ sender: GMStepper) {
label4.text = String(sender.value*4)
}
@IBOutlet weak var label4: UILabel!
@IBOutlet weak var label5: UILabel!
我的问题;有没有不使用按钮的解决方案?你能处理吗?
My question about ; Is there any solution without using buttons? Could you handle that?
*Label5 用于摘要.
*Label5 using for summary.
推荐答案
只是因为与 GMStepper 不同，UILabel 没有 value 属性.因此，您必须在每个标签中获取 text 字符串，将其转换为 Double，然后将它们相加:
Simply because, unlike a GMStepper, a UILabel doesn't have a value property. So you'll have to get the text string in each label, convert it to a Double, and then add them up:
if let text1 = label1.text, let value1 = Double(text1),
let text2 = label2.text, let value2 = Double(text2),
let text3 = label3.text, let value3 = Double(text3),
let text4 = label4.text, let value4 = Double(text4) {
let sum = value1 + value2 + value3 + value4
label5.text = String(sum)
}
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