Question

嗨，我正在编写一个有竞争力的应用程序。

UIAlertView *alert = [[UIAlertView alloc]

                      initWithTitle:@"Icon Contest!"
                      message:@"Design a 1024 x 1024 pixels icon for Example. The best one will be on the app's icon! Send them to: example@example.com."
                      delegate:self
                      cancelButtonTitle:@"More Info"
                      otherButtonTitles:@"Yes",@"No", nil];

[alert show];

我有截止日期，并且希望应用在1月31日结束时显示不同的提醒。

Answer 1

[NSDate date]返回当前日期使用NSDateComponent可以从NSDate获取月，日等详细信息。

Answer 2

正如yinkou所指出的，您可以使用[NSDate date]来获取当前日期。但是，如果您在-timeIntervalSinceNow上查看NSDate方法，可能会更简单。你可以这样做：

NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setDay:31];
[comps setMonth:1];
[comps setYear:2013];
NSDate *date = [[NSCalendar currentCalendar] dateFromComponents:comps];
if ([date timeIntervalSinceNow] < 0.0) {
    //The date has passed
}
else {
    //The date hasn't passed
}

Answer 3

NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay:31];
[components setMonth:1];
[components setYear:2013];

NSCalendar *gregorian = [[NSCalendar alloc]
                             initWithCalendarIdentifier:NSGregorianCalendar];

NSDate *releaseDate = [gregorian dateFromComponents:components];

if ([NSDate date] == releaseDate)
{
[alert show];
}

你如何在Xcode中检测它在iOS上的日期

3 个答案: