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我想编写一个BMI计算器转换 - 展开一个可选值
@IBOutlet var height: UITextField!
@IBOutlet var weight: UITextField!
@IBOutlet var message: UILabel!
@IBAction func keyPressed(sender: AnyObject) {
var peso = Double(weight.text.toInt()!)
var altura = Double(height.text.toInt()!) //ERROR LINE
var alturaquad = Double(peso) * Double(peso) //EXPONENTIAL
var imc = altura/alturaquad
message.text = "Your BMI is \(imc)"
}
我得到了下面的错误,我还不明白:
fatal error: unexpectedly found nil while unwrapping an Optional value
我的第二个问题是关于指数函数。它是战斗吗?