Ios 为递增的UILabel设置动画

我试图在视图出现时设置UILabel值的动画。因此，我创建了这个函数

private func animateIncrementUILabel(label: SpringLabel, labelValue: Int, animationPeriod: Float?)
{

    animationPeriod != nil ? animationPeriod! : 40

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), {

        for (var i = 0; i < labelValue; i++)
        {
            usleep(UInt32(animationPeriod!)/100 * 1000000)
            dispatch_async(dispatch_get_main_queue(), {
                label.text = String(i)
            })
        }

    })
}

它在标签中直接显示值，而不显示“动画增量”

---

我做错了什么？

在这种情况下，不要使用

usleep

和

dispatch\u async

。我建议您在之后使用

dispatch\u:

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(i * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    <#code to be executed after a specified delay#>
});

您还可以将一些参数传递给计时器：

func someFunc(){
    var arr = ["one", "two"] 
    var timer: NSTimer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: Selector("val:"), userInfo: arr, repeats: true)
}

func val(timer: NSTimer){

    //You'll get an array in timer.userInfo
    // arr = timer.userInfo.
    // Now you'll get you data in each index of arr

}

删除那些分派块并使用NSTimer.schedule活动而不是sleep，但我想给出几个参数。。如何使用NSTimer实现这一点？你能举个例子吗？但这样我不能强迫给出某些参数。这都是可选的
NSTimer.scheduledTimerWithTimeInterval(0.4, target: self, selector: "update", userInfo: nil, repeats: true)

func someFunc(){
    var arr = ["one", "two"] 
    var timer: NSTimer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: Selector("val:"), userInfo: arr, repeats: true)
}

func val(timer: NSTimer){

    //You'll get an array in timer.userInfo
    // arr = timer.userInfo.
    // Now you'll get you data in each index of arr

}