在代码中实现 NSTimer - Swift
Implementing NSTimer into Code - Swift
我在代码中使用/实现 NSTimer 时遇到了一些麻烦。到目前为止,我有这个:
//Delay function from
func delay(delay:Double, closure:()->()) {
dispatch_after(
//adds block for execution at a specific time
dispatch_time(
//creates a dispatch time relative to default clock
DISPATCH_TIME_NOW,
//Indicates that something needs to happen imediately
Int64(delay * Double(NSEC_PER_SEC))
//a 64bit decleration that holds the delay time times by the amount of nanoseconds in one seconds, inorder to turn the 'delay' input into seconds format
),
dispatch_get_main_queue(), closure)
}
@IBAction func computerTurn(){
if(isFirstLevel){levelLabel.text = ("Level 1"); isFirstLevel = false}
else{ level++ }
var gameOrderCopy = gameOrder
var randomNumber = Int(arc4random_uniform(4))
gameOrder.append(randomNumber)
var i = 0
var delayTime = Double(1)
println(Double(NSEC_PER_SEC))
for number in self.gameOrder{
if number == 0{
delay(delayTime++){self.greenButton.highlighted = true}
self.delay(delayTime++){
self.greenButton.highlighted = false
}
}
else if number == 1{
delay(delayTime++){self.redButton.highlighted = true}
self.delay(delayTime++){
self.redButton.highlighted = false
}
}
else if number == 2{
delay(delayTime++){self.yellowButton.highlighted = true}
self.delay(delayTime++){
self.yellowButton.highlighted = false
}
}
else if number == 3{
delay(delayTime++){self.blueButton.highlighted = true}
self.delay(delayTime++){
self.blueButton.highlighted = false
}
}
println(delayTime)
}
}
我需要做的是替换定时器功能,或摆脱它,并执行与此处发生的相同的操作,但使用 NSTimer。
谢谢
NSTimer
在这种情况下可能有点笨拙,因为它需要使用目标操作或 NSInvocation
。但是,NSTimer
是免费桥接 CFRunLoopTimer
的,您可以用块调用它:
func delay(delay:Double, closure:()->()) {
let fireDate = delay + CFAbsoluteTimeGetCurrent()
let timer = CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, fireDate, 0, 0, 0) { _ in
closure()
}
CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, kCFRunLoopCommonModes)
}
我建议:
设置一些 class 属性 以维护“当前”数字索引(从 0 开始);
启动重复计时器;
计时器的处理程序将使用索引来确定要更改的按钮,然后执行一个“打开突出显示”然后执行一个 dispatch_after
以“关闭突出显示” ;
然后,此处理程序将查看索引并确定您是否在列表末尾。如果你是,那么取消计时器,你就完成了。如果您不在列表的末尾,则增加“当前索引”并等待下一个预定计时器触发。
我在代码中使用/实现 NSTimer 时遇到了一些麻烦。到目前为止,我有这个:
//Delay function from
func delay(delay:Double, closure:()->()) {
dispatch_after(
//adds block for execution at a specific time
dispatch_time(
//creates a dispatch time relative to default clock
DISPATCH_TIME_NOW,
//Indicates that something needs to happen imediately
Int64(delay * Double(NSEC_PER_SEC))
//a 64bit decleration that holds the delay time times by the amount of nanoseconds in one seconds, inorder to turn the 'delay' input into seconds format
),
dispatch_get_main_queue(), closure)
}
@IBAction func computerTurn(){
if(isFirstLevel){levelLabel.text = ("Level 1"); isFirstLevel = false}
else{ level++ }
var gameOrderCopy = gameOrder
var randomNumber = Int(arc4random_uniform(4))
gameOrder.append(randomNumber)
var i = 0
var delayTime = Double(1)
println(Double(NSEC_PER_SEC))
for number in self.gameOrder{
if number == 0{
delay(delayTime++){self.greenButton.highlighted = true}
self.delay(delayTime++){
self.greenButton.highlighted = false
}
}
else if number == 1{
delay(delayTime++){self.redButton.highlighted = true}
self.delay(delayTime++){
self.redButton.highlighted = false
}
}
else if number == 2{
delay(delayTime++){self.yellowButton.highlighted = true}
self.delay(delayTime++){
self.yellowButton.highlighted = false
}
}
else if number == 3{
delay(delayTime++){self.blueButton.highlighted = true}
self.delay(delayTime++){
self.blueButton.highlighted = false
}
}
println(delayTime)
}
}
我需要做的是替换定时器功能,或摆脱它,并执行与此处发生的相同的操作,但使用 NSTimer。
谢谢
NSTimer
在这种情况下可能有点笨拙,因为它需要使用目标操作或 NSInvocation
。但是,NSTimer
是免费桥接 CFRunLoopTimer
的,您可以用块调用它:
func delay(delay:Double, closure:()->()) {
let fireDate = delay + CFAbsoluteTimeGetCurrent()
let timer = CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, fireDate, 0, 0, 0) { _ in
closure()
}
CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, kCFRunLoopCommonModes)
}
我建议:
设置一些 class 属性 以维护“当前”数字索引(从 0 开始);
启动重复计时器;
计时器的处理程序将使用索引来确定要更改的按钮,然后执行一个“打开突出显示”然后执行一个
dispatch_after
以“关闭突出显示” ;然后,此处理程序将查看索引并确定您是否在列表末尾。如果你是,那么取消计时器,你就完成了。如果您不在列表的末尾,则增加“当前索引”并等待下一个预定计时器触发。