显示隐藏的UIView两次，每5秒使用的NSTimer [英] Show Hide UIView Twice Every 5 Seconds Using NSTimer

问题描述

我有一个UIView添加到视图控制器。我想让它闪烁两次，每5秒。

I have a UIView added to a view controller. I want to make it blink twice every 5 seconds.

以下code，使眨眼的UIView和关闭每隔1秒：

The following code makes the UIView blink on and off every 1 second:

-(void) showHideView{
[UIView animateWithDuration:1
                      delay:5
                    options:UIViewAnimationOptionCurveEaseInOut
                 animations:^{
                     self.myview.alpha = 0;
                 }
                 completion:^(BOOL finished){
                     [UIView animateWithDuration:1
                                           delay:5
                                         options:UIViewAnimationOptionCurveEaseInOut
                                      animations:^{
                                          self.myview.alpha = 1;
                                      }
                                      completion:nil
                      ];
                 }
 ];
}

我怎样才能让UIView的闪烁两次，每5秒？ （即，两个闪烁的脉冲）

How can I make the UIView blink twice every 5 seconds? (i.e. a pulse of two blinks)

推荐答案

既然你举报这与iOS7，我可能会建议关键帧动画：

Since you've flagged this with iOS7, I might suggest keyframe animation:

[UIView animateKeyframesWithDuration:2.5 delay:0.0 options:UIViewKeyframeAnimationOptionRepeat animations:^{
    [UIView addKeyframeWithRelativeStartTime:0.0 relativeDuration:0.25 animations:^{
        self.myview.alpha = 0.0;
    }];

    [UIView addKeyframeWithRelativeStartTime:0.5 relativeDuration:0.25 animations:^{
        self.myview.alpha = 1.0;
    }];
} completion:nil];

扭捏总持续时间（频率重复循环），相对开始时间（总时间的百分比），相对持续时间（再次，总时间的百分比），你认为合适。

Tweak total duration (how often the cycle repeats), the relative start times (a % of the total duration), and the relative duration (again, a % of the total duration) as you see fit.

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