ios - 在 Objective-c 中检查时间？

如何以 hh:mm 格式获取当前时间？我需要能够分辨上午和下午，并比较当前时间和第二次时间。我确定这是一个愚蠢的功能，但我似乎无法弄清楚。

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Best Answer-推荐答案

当前日期和日期比较:

NSDate * now = [NSDate date];
NSDate * mile = [[NSDate alloc] initWithString"2001-03-24 10:45:32 +0600"];
NSComparisonResult result = [now compare:mile];

NSLog(@"%@", now);
NSLog(@"%@", mile);

switch (result)
{
    case NSOrderedAscending: NSLog(@"%@ is in future from %@", mile, now); break;
    case NSOrderedDescending: NSLog(@"%@ is in past from %@", mile, now); break;
    case NSOrderedSame: NSLog(@"%@ is the same as %@", mile, now); break;
    default: NSLog(@"erorr dates %@, %@", mile, now); break;
}

[mile release];

对于日期格式，有一个 NSDateFormatter。您可以在 Date and Time programming guide for cocoa 中找到更多信息和 Date formatters在数据格式指南中，来自链接的示例:

NSDateFormatter *inputFormatter = [[NSDateFormatter alloc] init];
[inputFormatter setDateFormat"yyyy-MM-dd 'at' HH:mm"];

NSDate *formatterDate = [inputFormatter dateFromString"1999-07-11 at 10:30"];

NSDateFormatter *outputFormatter = [[NSDateFormatter alloc] init];
[outputFormatter setDateFormat"HH:mm 'on' EEEE MMMM d"];

NSString *newDateString = [outputFormatter stringFromDate:formatterDate];

NSLog(@"newDateString %@", newDateString);
// For US English, the output is:
// newDateString 10:30 on Sunday July 11

关于ios - 在 Objective-c 中检查时间？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/2576130/