我收到以下运行时错误:
2014-07-15 16:49:44.893 TransporterGUI[1527:303] -[_TtC14TransporterGUI11AppDelegate printCountdown]:无法识别的选择器发送到实例 0x10040e8a0
当我使用以下 Swift 代码来触发计时器时:
@IBAction func schedule(sender : AnyObject) {
var startTime = startDatePicker.dateValue.timeIntervalSinceDate(NSDate())
var endTime = endDatePicker.dateValue.timeIntervalSinceDate(startDatePicker.dateValue)
var startDate = NSDate.date()
let params = ["startTime": startTime, "startDate": startDate]
var counter = NSTimer.scheduledTimerWithTimeInterval(1.0, target:self, selector:Selector("printCountdown"),
userInfo:params, repeats:true)
}
func printCountdown(timer: NSTimer) {
var userInfo = timer.userInfo as NSDictionary
var startTime = userInfo["startTime"] as NSTimeInterval
var startDate = userInfo["startDate"] as NSDate
var elapsedTime: NSTimeInterval = NSDate.date().timeIntervalSinceDate(startDate)
var remainingTime: NSTimeInterval = startTime - elapsedTime;
if (remainingTime <= 0.0) {
timer.invalidate()
transferLabel.title = "No transfer scheduled"
}
transferLabel.title = remainingTime.description
}
奇怪的是,如果我将函数 printCountdown 的签名更改为不带参数,则会正确调用该函数,但我无法访问进行调用的计时器对象。
提前致谢!
您的选择器应该是“printCountdown:”,并带有终止冒号以指示选择器采用参数。
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