我正在尝试计算车辆在两个检查站之间行驶所需的时间。我设置了以下计时器来实现此目的。
func startTimer() {
if hasStarted == true && timerStarted == false {
print("Timing started!")
gameTimer = Timer.scheduledTimer(timeInterval: 0.001, target: self, selector: (#selector(activeTiming)), userInfo: nil, repeats: true)
timerStarted = true
}
}
@objc func activeTiming() {
print("Active timing block")
if(hasFinished == false) {
gameTime = gameTime + 0.001
print("Add time succeeded")
} else {
gameTimer?.invalidate()
}
}
预期输出如下：
Timing started!
Active timing block
Add time succeeded
Add time succeeded ... etc
实际输出：
Timing started!
因此，看起来 startTimer 被正确调用，但计时器没有触发 activeTiming 代码块。任何建议都会非常有帮助。提前谢谢你的帮助。
发布此代码是因为它是我正在使用的代码，但我不是 Swift 专家，所以您的情况可能会有所不同！
class PerformanceTest {
var name: String = ""
var tolerance: Int64 = 0
var lastTime: Int64 = 0
var thisTime: Int64 = 0
var delta: Int64 = 0
var percent: Float = 0
func setTolerance(vName: String, vTolerance: Int64) {
name = vName
tolerance = vTolerance
}
func reset() {
delta = 0
percent = Float((Float(delta) / Float(tolerance))) * 100
//high = 0
}
func start() {
lastTime = Date().toMillis()
}
func finish() {
thisTime = Date().toMillis()
let vDelta = thisTime - lastTime
if(vDelta > delta) {
delta = vDelta
percent = Float((Float(delta) / Float(tolerance))) * 100
if(delta > tolerance) {
print("Performance Indicator: \(name) Above Tolerance" + String(format: "%3.0f", percent) + "%")
}
}
}
func display() -> String {
//high = delta
//print("\(vString) Tolerance: \(tolerance) Max: \(high)")
return String(format: "%3.0f", percent) + "% |"
}
}
extension Date {
func toMillis() -> Int64! {
return Int64(self.timeIntervalSince1970 * 1000)
}
Usage:
var performanceDefenseLoop = PerformanceTest()
performanceDefenseLoop.setTolerance(vName: "DefenseLoop", vTolerance: 150)
func timeToUpdateDefenses()
{
performanceDefenseLoop.start()
defesensesLoop()
performanceDefenseLoop.finish()
print("\(performanceDefenseLoop.Display())"
}
// 重置
性能DefenseLoop.reset()
请务必在主线程中启动计时器！
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