方法如下:
工具:iPhone 8
操作系统:iOS 14.4.1
程序:设置
1、首先,打开iPhone8上面的“时钟”APP,如图所示。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/730e0cf3d7ca7bcb9b12534fae096b63f624a861?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
2、进入时钟之后,选择计时器中的“计时结束时启用”,点击进入,如图所示。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/91529822720e0cf3589eda9b1a46f21fbe09aa61?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
3、进入之后,把页面拉倒最下面,选择其中的“停止播放”,然后点击右上角的“设定”,如图所示。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/d6ca7bcb0a46f21f2d5dca33e6246b600c33ae61?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
4、然后选择好要倒计时的时间,比如“4小时15分”,然后点击页面上的“开始计时”,如图所示。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/0df3d7ca7bcb0a46604b1f597b63f6246b60af61?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
5、然后就会进入倒计时的页面,倒计时结束之后,iPhone就会自动关机了,想中途结束,点击其中的“取消”按钮即可,如图所示。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/9922720e0cf3d7caeb9fab16e21fbe096b63a961?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
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