检查指定的日期是今天，昨天还是将来的日期
问题描述：
我有一个关于NSDate的查询。我有一个日期，即2011-10-04 07:36:38 +0000，我想检查这个日期是昨天，今天还是将来的日期。
I have one query regarding NSDate. I have a date i.e. "2011-10-04 07:36:38 +0000", and I want to check if this date is yesterday, or today or a future date.
我将如何解决这个问题？
How would I go about this?
答
试试这个：
注意：根据需要更改日期格式。
Note: Change the date format as per your need.
NSDateFormatter* df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"MM/dd/yyyy"];
NSDate* enteredDate = [df dateFromString:@"10/04/2011"];
NSDate * today = [NSDate date];
NSComparisonResult result = [today compare:enteredDate];
switch (result)
{
case NSOrderedAscending:
NSLog(@"Future Date");
break;
case NSOrderedDescending:
NSLog(@"Earlier Date");
break;
case NSOrderedSame:
NSLog(@"Today/Null Date Passed"); //Not sure why This is case when null/wrong date is passed
break;
}