Swift3 是什么导致了“a”；SIGABRT“；Xcode 8.3中的AppDelegate文件出错？
@UIApplicationMain 类AppDelegate:UIResponder，UIApplicationLegate{//线程1:信号SIGABRTSwift3 是什么导致了“a”；SIGABRT“；Xcode 8.3中的AppDelegate文件出错？,swift3,sigabrt,xcode8,Swift3,Sigabrt,Xcode8,@UIApplicationMain 类AppDelegate:UIResponder，UIApplicationLegate{//线程1:信号SIGABRT var window: UIWindow? “线程1：信号SIGABRT”位于“类”行的末尾 总结 用户输入膳食小计、小费百分比和税收百分比；程序输出税额、小费金额和膳食总成本。这是一个简单的单视图程序。我没有对AppDelegate文件进行任何更改。所有代码都添加到ViewController文件中 AppDelegate文件中没有其
var window: UIWindow?
import UIKit
class ViewController: UIViewController, UITextFieldDelegate {
@IBOutlet var txtMealCost: UITextField!
@IBOutlet var txtTipPercent: UITextField!
@IBOutlet var txtTaxRatePercent: UITextField!
@IBOutlet weak var lblTaxAmt: UILabel!
@IBOutlet weak var lblTipAmt: UILabel!
@IBOutlet weak var lblTotalCost: UILabel!
/* var mealCost = Double(txtMealCost.text)
var tipPercent : Float = 0
var taxRatePercent : Float = txtTaxRatePercent.text
var taxAmt : Float = 0
var tipAmt : Float = 0
var totalCost : Float = 0
var totalCost = mealCost + taxAmt + tipAmt
*/
@IBAction func btnCalculate(_ sender: UIButton) {
var mealCost = Double(txtMealCost.text!)!
var tipPercent = Double(txtTipPercent.text!)!
var taxRatePercent = Double(txtTaxRatePercent.text!)!
var taxAmt = mealCost * taxRatePercent
var lblTaxAmt = String(taxAmt)
var tipAmt = mealCost * tipPercent
var lblTipAmt = String(lblTipAmt)
var totalCost = mealCost + taxAmt + tipAmt
var lblTotalCost = String(totalCost)
/* var fMealCost = (mealCost as NSString).floatValue
var fTipPercent = tipPercent
var fTaxRatePercent = taxRatePercent
var fTaxAmt = taxAmt
var fTipAmt = tipAmt
*/ // var fTotalCost = totalCost
}
@IBAction func Clear(_ sender: UIButton) {
txtMealCost.text = ""
txtTipPercent.text = ""
txtTaxRatePercent.text = ""
lblTaxAmt.text = ""
lblTipAmt.text = ""
lblTotalCost.text = ""
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
（lldb）
在此处输入代码