在iPhone App中创建倒数计时器

问题描述

我想在我的应用中使用倒数计时器.我有这个日期

I want to use a countdown timer in my app.I have this date

03-09-2011T20:54:18Z

03-09-2011T20:54:18Z

现在，我想在此日期使用倒数计时器.您能否建议是否有与此相关的任何方法.如果我不清楚，请随时告诉我.预先感谢.

Now I want to use countdown timer for this date. Can you please suggest if there is any method regarding this. I f I am not clear at any point please let me know. Thanks in advance.

推荐答案

将时间戳记转换为NSDate *(请参见此处)

Turn that timestamp into an NSDate* (see here)

然后

NSTimeInterval interval = [timestamp timeIntervalSinceNow];

将始终为您提供从现在到您关心的日期之间的秒数.然后，您可以执行以下操作:

will always give you the number of seconds between now and the date you care about. Then you can do something like:

#define SECONDS_IN_MINUTE 60
#define SECONDS_IN_HOUR (SECONDS_IN_MINUTE * 60)
#define SECONDS_IN_DAY (SECONDS_IN_HOUR * 24)

NSInteger days, hours, minutes, seconds;
days = interval / SECONDS_IN_DAY;
interval %= SECONDS_IN_DAY;
hours = interval / SECONDS_IN_HOUR;
interval %= SECONDS_IN_HOUR;
minutes = interval / SECONDS_IN_MINUTE;
seconds %= SECONDS_IN_MINUTE;

如果您希望它每秒更新一次实时"，则使用performSelector:withObject:afterDelay:并延迟您想要更新显示的任何时间(或者每次运行循环仅需0.0来进行更新)

If you want it to update "live" every second then use performSelector:withObject:afterDelay: with a delay of whatever period you want to update the display (or just 0.0 to do it every run loop)

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