我需要一个接收 [NSDate date] 和字符串 @"2010-11-12" 并返回这两个日期之间的天数的函数。
更多解释：
我需要在我的 NSUserdefaults 中以 @"2010-11-12" 格式存储来自服务器的日期。该日期的含义是 iPhone 应用程序中某个功能的过期日期。每次我按下此功能的按钮时，我都需要检查当前时间->[NSDate date] 和@“2010-11-12”之间的天数差异是否大于 0。这意味着该功能是禁用。
这让我发疯，也许这很简单。
I need a function which receives [NSDate date] and a string @"2010-11-12" and returns the amount of days between those two dates.
More explanation:
I need to store a date from a server in the format @"2010-11-12" in my NSUserdefaults. The meaning of this date is the expireDate of a feature in an iPhone App. Every time I press on a button for this feature I need to check if the difference in days between the current time->[NSDate date] and @"2010-11-12" is greater than 0. That means that the feature is disabled.
It's making me crazy, maybe it's dead simple.
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使用 NSDateFormatter 将字符串转换为 NSDate - 然后比较日期对象。
Use an NSDateFormatter to convert the string to an NSDate - then compare the date objects.