blocks|key|1374001|text|关于如何将startDate和endDate设置为上述给定答案的示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1374002|...

NSCalendar+*calendar+=+[NSCalendar+currentCalendar];
NSDateComponents+*components+=+[calendar+components:(NSCalendarUnitYear+%7C+NSCalendarUnitMonth+)+fromDate:[NSDate+date]];
//create+a+date+with+these+components
NSDate+*startDate+=+[calendar+dateFromComponents:components];
[components+setMonth:1];
[components+setDay:0];+//reset+the+other+components
[components+setYear:0];+//reset+the+other+components
NSDate+*endDate+=+[calendar+dateByAddingComponents:components+toDate:startDate+options:0];
predicate+=+[NSPredicate+predicateWithFormat:@"((date+>=+%25@)+AND+(date+<+%25@))+%7C%7C+(date+=+nil)",startDate,endDate];

...|code-block|syntax|javascript|1374003|我在这里搜索了一个月内的所有条目。值得一提的是，这个例子还展示了如何搜索“nil”日期条目。|1374004|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Example on how to also set up startDate and endDate to the above given answer:

<pre><code>...

NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:(NSCalendarUnitYear | NSCalendarUnitMonth ) fromDate:[NSDate date]];
//create a date with these components
NSDate *startDate = [calendar dateFromComponents:components];
[components setMonth:1];
[components setDay:0]; //reset the other components
[components setYear:0]; //reset the other components
NSDate *endDate = [calendar dateByAddingComponents:components toDate:startDate options:0];
predicate = [NSPredicate predicateWithFormat:@"((date &gt;= %@) AND (date &lt; %@)) || (date = nil)",startDate,endDate];

...
</code></pre>

Here I was searching for all entries within one month. It's worth to mention, that this example also shows how to search 'nil' date-entires.

blocks|key|1374071|text|在Swift中，我得到了类似的东西：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1374072|++++++++let+dateFormatter+=+NSDateFormatter()
++++++++dateFormatter.dateFormat+=+"yyyy-MM-dd"
++++++++let+date+=+dateFormatter.dateFromString(predicate)
++++++++let+calendar+=+NSCalendar(calendarIdentifier:+NSGregorianCalendar)
++++++++let+components+=+calendar!.components(
++++++++++++NSCalendarUnit.CalendarUnitYear+%7C
++++++++++++++++NSCalendarUnit.CalendarUnitMonth+%7C
++++++++++++++++NSCalendarUnit.CalendarUnitDay+%7C
++++++++++++++++NSCalendarUnit.CalendarUnitHour+%7C
++++++++++++++++NSCalendarUnit.CalendarUnitMinute+%7C
++++++++++++++++NSCalendarUnit.CalendarUnitSecond,+fromDate:+date!)
++++++++components.hour+=+00
++++++++components.minute+=+00
++++++++components.second+=+00
++++++++let+startDate+=+calendar!.dateFromComponents(components)
++++++++components.hour+=+23
++++++++components.minute+=+59
++++++++components.second+=+59
++++++++let+endDate+=+calendar!.dateFromComponents(components)
++++++++predicate+=+NSPredicate(format:+"day+>=+%25@+AND+day+=<+%25@",+argumentArray:+[startDate!,+endDate!])|code-block|syntax|javascript|1374073|我花了一段时间才发现在NSPredicate中字符串插值"\(this+notation)"不能用于比较日期。|offset|length|style|CODE|1374074|entityMap^0|0|0|S|I|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

In Swift I got something similar to:

<pre><code> let dateFormatter = NSDateFormatter()
 dateFormatter.dateFormat = "yyyy-MM-dd"
 let date = dateFormatter.dateFromString(predicate)
 let calendar = NSCalendar(calendarIdentifier: NSGregorianCalendar)
 let components = calendar!.components(
 NSCalendarUnit.CalendarUnitYear |
 NSCalendarUnit.CalendarUnitMonth |
 NSCalendarUnit.CalendarUnitDay |
 NSCalendarUnit.CalendarUnitHour |
 NSCalendarUnit.CalendarUnitMinute |
 NSCalendarUnit.CalendarUnitSecond, fromDate: date!)
 components.hour = 00
 components.minute = 00
 components.second = 00
 let startDate = calendar!.dateFromComponents(components)
 components.hour = 23
 components.minute = 59
 components.second = 59
 let endDate = calendar!.dateFromComponents(components)
 predicate = NSPredicate(format: "day &gt;= %@ AND day =&lt; %@", argumentArray: [startDate!, endDate!])
</code></pre>

I had a hard time to discover that string interpolation <code>"\(this notation)"</code> doesn't work for comparing dates in NSPredicate.

blocks|key|1374192|text|对我来说，这是可行的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1374193|NSCalendar+*calendar+=+[NSCalendar+currentCalendar];
++++NSDateComponents+*components+=+[calendar+components:(NSYearCalendarUnit+%7C+NSMonthCalendarUnit+)+fromDate:[NSDate+date]];
++++//create+a+date+with+these+components
++++NSDate+*startDate+=+[calendar+dateFromComponents:components];
++++[components+setMonth:0];
++++[components+setDay:0];+//reset+the+other+components
++++[components+setYear:0];+//reset+the+other+components
++++NSDate+*endDate+=+[calendar+dateByAddingComponents:components+toDate:startDate+options:0];

++++startDate+=+[NSDate+date];
++++endDate+=+[startDate+dateByAddingTimeInterval:-(7+*+24+*+60+*+60)];//change+here

++++NSString+*startTimeStamp+=+[[NSNumber+numberWithInt:floor([endDate+timeIntervalSince1970])]+stringValue];
++++NSString+*endTimeStamp+=+[[NSNumber+numberWithInt:floor([startDate+timeIntervalSince1970])]+stringValue];


+++NSPredicate+*predicate+=+[NSPredicate+predicateWithFormat:@"((paidDate1+>=+%25@)+AND+(paidDate1+<+%25@))",startTimeStamp,endTimeStamp];
++++NSLog(@"predicate+is+%25@",predicate);
++++totalArr+=+[completeArray+filteredArrayUsingPredicate:predicate];
++++[self+filterAndPopulateDataBasedonIndex];
++++[self.tableviewObj+reloadData];
++++NSLog(@"result+is+%25@",totalArr);|code-block|syntax|javascript|1374194|我已经过滤了从当前日期到7天前的数组。我是说，我从当前日期获得了一周的数据。这应该是可行的。|1374195|注意:我正在转换日期，这是与毫秒到来的1000，并比较之后。如果你需要澄清，请告诉我。|1374196|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For me this is worked.

<pre><code>NSCalendar *calendar = [NSCalendar currentCalendar];
 NSDateComponents *components = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit ) fromDate:[NSDate date]];
 //create a date with these components
 NSDate *startDate = [calendar dateFromComponents:components];
 [components setMonth:0];
 [components setDay:0]; //reset the other components
 [components setYear:0]; //reset the other components
 NSDate *endDate = [calendar dateByAddingComponents:components toDate:startDate options:0];

 startDate = [NSDate date];
 endDate = [startDate dateByAddingTimeInterval:-(7 * 24 * 60 * 60)];//change here

 NSString *startTimeStamp = [[NSNumber numberWithInt:floor([endDate timeIntervalSince1970])] stringValue];
 NSString *endTimeStamp = [[NSNumber numberWithInt:floor([startDate timeIntervalSince1970])] stringValue];


 NSPredicate *predicate = [NSPredicate predicateWithFormat:@"((paidDate1 &gt;= %@) AND (paidDate1 &lt; %@))",startTimeStamp,endTimeStamp];
 NSLog(@"predicate is %@",predicate);
 totalArr = [completeArray filteredArrayUsingPredicate:predicate];
 [self filterAndPopulateDataBasedonIndex];
 [self.tableviewObj reloadData];
 NSLog(@"result is %@",totalArr);
</code></pre>

I have filtered array from current date to 7 days back. I mean I am getting one week data from current date. This should work. 

Note: I am converting date which is coming with milli seconds by 1000, and comparing after. Let me know if you need any clarity.

blocks|key|1374252|text|我将答案从Glauco+Neves移植到Swift+2.0，并将其封装在一个函数中，该函数接收日期并返回相应日期的NSPredicate：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1374253|func+predicateForDayFromDate(date:+NSDate)+->+NSPredicate+{
++++let+calendar+=+NSCalendar(calendarIdentifier:+NSCalendarIdentifierGregorian)
++++let+components+=+calendar!.components([.Year,+.Month,+.Day,+.Hour,+.Minute,+.Second],+fromDate:+date)
++++components.hour+=+00
++++components.minute+=+00
++++components.second+=+00
++++let+startDate+=+calendar!.dateFromComponents(components)
++++components.hour+=+23
++++components.minute+=+59
++++components.second+=+59
++++let+endDate+=+calendar!.dateFromComponents(components)

++++return+NSPredicate(format:+"day+>=+%25@+AND+day+=<+%25@",+argumentArray:+[startDate!,+endDate!])
}|code-block|syntax|javascript|1374254|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/30484150/133166^0|1L|B|5|C|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

I ported the answer from <a href="https://stackoverflow.com/a/30484150/133166">Glauco Neves</a> to Swift 2.0 and wrapped it inside a function that receives a date and returns the <code>NSPredicate</code> for the corresponding day:

<pre><code>func predicateForDayFromDate(date: NSDate) -&gt; NSPredicate {
 let calendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
 let components = calendar!.components([.Year, .Month, .Day, .Hour, .Minute, .Second], fromDate: date)
 components.hour = 00
 components.minute = 00
 components.second = 00
 let startDate = calendar!.dateFromComponents(components)
 components.hour = 23
 components.minute = 59
 components.second = 59
 let endDate = calendar!.dateFromComponents(components)

 return NSPredicate(format: "day &gt;= %@ AND day =&lt; %@", argumentArray: [startDate!, endDate!])
}
</code></pre>

blocks|key|1159054|text|我最近花了一些时间尝试解决同样的问题，并将以下选项添加到备选列表中，以准备开始和结束日期(包括iOS+8和更高版本的更新方法)……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1159055|NSDate+*dateDay+=+nil;
NSDate+*dateDayStart+=+nil;
NSDate+*dateDayNext+=+nil;

dateDay+=+<<USER_INPUT>>;

dateDayStart+=+[[NSCalendar+currentCalendar]+startOfDayForDate:dateDay];

//++dateDayNext+EITHER
dateDayNext+=+[dateDayStart+dateByAddingTimeInterval:(24+*+60+*+60)];

//++dateDayNext+OR
NSDateComponents+*dateComponentDay+=+nil;
dateComponentDay+=+[[NSDateComponents+alloc]+init];
[dateComponentDay+setDay:1];
dateDayNext+=+[[NSCalendar+currentCalendar]+dateByAddingComponents:dateComponentDay
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++toDate:dateDayStart
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++options:NSCalendarMatchNextTime];|code-block|syntax|javascript|1159056|...and+NSPredicate+for+the+Core+Data+NSFetchRequest+(如上面其他答案中所示)...|offset|length|style|CODE|1159057|[NSPredicate+predicateWithFormat:@"(dateAttribute+>=+%25@)+AND+(dateAttribute+<+%25@)",+dateDayStart,+dateDayNext]]|1159058|entityMap^0|0|0|7|B|11|E|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]|$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

I've recently spent some time attempting to solve this same problem and add the following to the list of alternatives to prepare start and end dates (includes updated method for iOS 8 and above)...

<pre><code>NSDate *dateDay = nil;
NSDate *dateDayStart = nil;
NSDate *dateDayNext = nil;

dateDay = &lt;&lt;USER_INPUT&gt;&gt;;

dateDayStart = [[NSCalendar currentCalendar] startOfDayForDate:dateDay];

// dateDayNext EITHER
dateDayNext = [dateDayStart dateByAddingTimeInterval:(24 * 60 * 60)];

// dateDayNext OR
NSDateComponents *dateComponentDay = nil;
dateComponentDay = [[NSDateComponents alloc] init];
[dateComponentDay setDay:1];
dateDayNext = [[NSCalendar currentCalendar] dateByAddingComponents:dateComponentDay
 toDate:dateDayStart
 options:NSCalendarMatchNextTime];
</code></pre>

...and the <code>NSPredicate</code> for the Core Data <code>NSFetchRequest</code> (as already shown above in other answers)...

<pre><code>[NSPredicate predicateWithFormat:@"(dateAttribute &gt;= %@) AND (dateAttribute &lt; %@)", dateDayStart, dateDayNext]]
</code></pre>

blocks|key|1374353|text|补充Rafael的答案(非常有用，谢谢！)，移植到Swift+3。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1374354|func+predicateForDayFromDate(date:+Date)+->+NSPredicate+{
++++let+calendar+=+Calendar(identifier:+Calendar.Identifier.gregorian)
++++var+components+=+calendar.dateComponents([.year,+.month,+.day,+.hour,+.minute,+.second],+from:+date)
++++components.hour+=+00
++++components.minute+=+00
++++components.second+=+00
++++let+startDate+=+calendar.date(from:+components)
++++components.hour+=+23
++++components.minute+=+59
++++components.second+=+59
++++let+endDate+=+calendar.date(from:+components)

++++return+NSPredicate(format:+"YOUR_DATE_FIELD+>=+%25@+AND+YOUR_DATE_FIELD+=<+%25@",+argumentArray:+[startDate!,+endDate!])
}|code-block|syntax|javascript|1374355|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Adding to Rafael's answer (incredibly useful, thank you!), porting for Swift 3. 

<pre><code>func predicateForDayFromDate(date: Date) -&gt; NSPredicate {
 let calendar = Calendar(identifier: Calendar.Identifier.gregorian)
 var components = calendar.dateComponents([.year, .month, .day, .hour, .minute, .second], from: date)
 components.hour = 00
 components.minute = 00
 components.second = 00
 let startDate = calendar.date(from: components)
 components.hour = 23
 components.minute = 59
 components.second = 59
 let endDate = calendar.date(from: components)

 return NSPredicate(format: "YOUR_DATE_FIELD &gt;= %@ AND YOUR_DATE_FIELD =&lt; %@", argumentArray: [startDate!, endDate!])
}
</code></pre>

blocks|key|1374388|text|日期的Swift+3.0扩展：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1374389|extension+Date{

func+makeDayPredicate()+->+NSPredicate+{
++++let+calendar+=+Calendar.current
++++var+components+=+calendar.dateComponents([.year,+.month,+.day,+.hour,+.minute,+.second],+from:+self)
++++components.hour+=+00
++++components.minute+=+00
++++components.second+=+00
++++let+startDate+=+calendar.date(from:+components)
++++components.hour+=+23
++++components.minute+=+59
++++components.second+=+59
++++let+endDate+=+calendar.date(from:+components)
++++return+NSPredicate(format:+"day+>=+%25@+AND+day+=<+%25@",+argumentArray:+[startDate!,+endDate!])
}
}|code-block|syntax|javascript|1374390|然后使用like：|1374391|+let+fetchReq+=+NSFetchRequest(entityName:+"MyObject")
+fetchReq.predicate+=+myDate.makeDayPredicate()|1374392|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Swift 3.0 extension for Date: 

<pre><code>extension Date{

func makeDayPredicate() -&gt; NSPredicate {
 let calendar = Calendar.current
 var components = calendar.dateComponents([.year, .month, .day, .hour, .minute, .second], from: self)
 components.hour = 00
 components.minute = 00
 components.second = 00
 let startDate = calendar.date(from: components)
 components.hour = 23
 components.minute = 59
 components.second = 59
 let endDate = calendar.date(from: components)
 return NSPredicate(format: "day &gt;= %@ AND day =&lt; %@", argumentArray: [startDate!, endDate!])
}
}
</code></pre>

Then use like: 

<pre><code> let fetchReq = NSFetchRequest(entityName: "MyObject")
 fetchReq.predicate = myDate.makeDayPredicate()
</code></pre>

blocks|key|1374424|text|在前面答案的基础上，使用Swift+5.x更新和替代方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1374425|func+predicateForDayUsingDate(_+date:+Date)+->+NSPredicate+{
++++
++++var+calendar+=+Calendar.current
++++calendar.timeZone+=+NSTimeZone.local
++++//+following+creates+exact+midnight+12:00:00:000+AM+of+day
++++let+startOfDay+=+calendar.startOfDay(for:+date)
++++//+following+creates+exact+midnight+12:00:00:000+AM+of+next+day
++++let+endOfDay+=+calendar.date(byAdding:+.day,+value:+1,+to:+startOfDay)!
++++
++++return+NSPredicate(format:+"day+>=+%25@+AND+day+<+%25@",+argumentArray:+[startOfDay,+endOfDay])
}|code-block|syntax|javascript|1374426|如果您希望将endOfDay的时间创建为晚上11:59:59，则可以包含...|offset|length|style|CODE|1374427|++++let+endOfDayLessOneSecond+=+endOfDay.addingTimeInterval(TimeInterval(-1))|1374428|但随后您可能会将NSPredicate更改为...|1374429|++++return+NSPredicate(format:+"day+>=+%25@+AND+day+<=+%25@",+argumentArray:+[startOfDay,+endOfDayLessOneSecond])|1374430|从day+<+%25@到day+<=+%25@的更改的...with特定说明。|1374431|entityMap^0|0|0|6|8|0|0|0|0|1|8|A|9|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|14|8|@$I|15|J|16|K|L]|$I|17|J|18|K|L]]|9|@]|A|$]]|$1|U|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|V|$]]

Building on the previous answers, an update and alternative method using Swift 5.x
<pre><code>func predicateForDayUsingDate(_ date: Date) -&gt; NSPredicate {
 
 var calendar = Calendar.current
 calendar.timeZone = NSTimeZone.local
 // following creates exact midnight 12:00:00:000 AM of day
 let startOfDay = calendar.startOfDay(for: date)
 // following creates exact midnight 12:00:00:000 AM of next day
 let endOfDay = calendar.date(byAdding: .day, value: 1, to: startOfDay)!
 
 return NSPredicate(format: &quot;day &gt;= %@ AND day &lt; %@&quot;, argumentArray: [startOfDay, endOfDay])
}
</code></pre>
If you'd prefer to create the time for <code>endOfDay</code> as 11:59:59 PM, you can instead include...
<pre><code> let endOfDayLessOneSecond = endOfDay.addingTimeInterval(TimeInterval(-1))
</code></pre>
but then you might change the NSPredicate to...
<pre><code> return NSPredicate(format: &quot;day &gt;= %@ AND day &lt;= %@&quot;, argumentArray: [startOfDay, endOfDayLessOneSecond])
</code></pre>
...with specific note of the change from <code>day &lt; %@</code> to <code>day &lt;= %@</code>.

I have a Core Data model with an <code>NSDate</code> property. I want to filter the database by day. I assume the solution will involve an <code>NSPredicate</code>, but I'm not sure how to put it all together.

I know how to compare the day of two <code>NSDate</code>s using <code>NSDateComponents</code> and <code>NSCalendar</code>, but how do I filter it with an <code>NSPredicate</code>?

Perhaps I need to create a category on my <code>NSManagedObject</code> subclass that can return a bare date with just the year, month and day. Then I could compare that in an <code>NSPredicate</code>. Is this your recommendation, or is there something simpler?

NSPredicate: filtering objects by day of NSDate property

数据库

Swift

我有一个具有NSDate属性的核心数据模型。我想按天过滤数据库。我假设解决方案将涉及NSPredicate，但我不确定如何将它们组合在一起。我知道如何使用NSDateComponents和NSCalendar比较两个NSDate的日期，但是如何使用NSPredicate过滤它呢？也许我需要在我的NSManagedObj...

问NSPredicate:按NSDate属性的日期过滤对象
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