ios - Objective C 如何在 array 中按升序排序日期

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123 1

我有一个包含字符串格式的日期的NSMutableArray 。 在这里,我需要按照日期的升序排序那个 array 。 我用了的strong


 NSSortDescriptor *descriptor=[[NSSortDescriptor alloc] initWithKey:@"self" ascending:YES];


 NSArray *descriptors=[NSArray arrayWithObject: descriptor];


 NSArray *reverseOrder=[dateArray sortedArrayUsingDescriptors:descriptors];



但它只按日期和月份的升序排序日期。 不考虑年份。请帮助我。 例如 array 包含


 03/09/2017, 03/06/2016, 01/06/2016,01/04/2016 and 03/01/2017.



在使用上面的代码行之后,array 包含


 01/04/2018, 01/06/2016, 03/01/2017, 03/06/2016, 03/09/2016



时间:

101 4

你需要像这样使用 sortedArrayUsingComparator 以字符串 array 排序日期。


NSDateFormatter *df = [[NSDateFormatter alloc] init];


[df setDateFormat:@"MM/dd/yyyy"];


NSArray *sortedArray = [yourArray sortedArrayUsingComparator:^NSComparisonResult(NSString *obj1, NSString *obj2) {


 NSDate *d1 = [df dateFromString: obj1];


 NSDate *d2 = [df dateFromString: obj2];


 return [d1 compare: d2];


}];



注意:如果你的日期是 formate,那么很难从你的例子中找到日期,这就是我用 MM/dd/yyyy的原因,如果你的日期包含了 formate,那就用它。

原作者:
144 0

你的代码是正确的但日期格式错误。

请尝试以下代码:


NSMutableArray *dateArray = [[NSMutableArray alloc] initWithArray: @[@"03/09/2017", @"03/06/2016", @"01/06/2016",@"01/04/2016", @"03/01/2017"]];


NSDateFormatter *formatter = [[NSDateFormatter alloc] init];


NSDate *date;


for (int i = 0; i <dateArray.count; i++) {


 [formatter setDateFormat:@"MM/dd/yyyy"];//Please your date format set.


 date = [formatter dateFromString:[dateArray objectAtIndex:i]];


 [formatter setDateFormat:@"yyyy/MM/dd"];


 [dateArray replaceObjectAtIndex:i withObject:[formatter stringFromDate:date]];


}


NSSortDescriptor *descriptor=[[NSSortDescriptor alloc] initWithKey:@"self" ascending:YES];


NSArray *descriptors=[NSArray arrayWithObject: descriptor];


NSArray *reverseOrder=[dateArray sortedArrayUsingDescriptors:descriptors];



NSLog(@"Array: %@",reverseOrder);



68 5

请尝试以下代码:


NSArray *strDateArray = [[NSArray alloc] initWithObjects:@"03/09/2017",@"03/06/2016", @"01/06/2016",@"01/04/2016",@"03/01/2017", nil];



 NSDateFormatter *formatter = [[NSDateFormatter alloc] init];


 [formatter setDateFormat:@"MM/dd/yyyy"];



 NSMutableArray *dateArray = [[NSMutableArray alloc] init];



 for (NSString *dateString in strDateArray) {


 NSDate *date = [formatter dateFromString:dateString];


 [dateArray addObject:date];


 }



//sort array of dates


 [dateArray sortUsingComparator:^NSComparisonResult(NSDate *date1, NSDate *date2) {


//return date1 compare date2 for ascending. And reverse the call for ascending.


 return [date1 compare:date2];


 }];



 NSLog(@"dateArray %@", dateArray);


 NSMutableArray *sortedDateArray = [[NSMutableArray alloc] init];



 for (NSDate *date in dateArray) {


 NSString *dateString = [formatter stringFromDate:date];


 [sortedDateArray addObject:dateString];


 }



 NSLog(@"sortedDateArray %@", sortedDateArray);



118 5

用于 Swift 4.0


let formater = DateFormatter()


 formater.dateFormat ="MM/dd/yyyy"//date formate should be according to your date formate


 let sortedArray=arrayToSort.sorted(){


 (obj1, obj2) in


 let date1=formater.date(from: obj1)


 let date2=formater.date(from: obj2)


 return date1!<date2!


 }



93 0

//You 可以根据你的代码更改日期格式

NSDateFormatter *df = [[NSDateFormatter alloc] init] ;[ df setDateFormat:@"MM/dd/yyyy"];


 NSArray *sortedArray = [YourArray sortedArrayUsingComparator:^NSComparisonResult(NSDictionary *obj1, NSDictionary *obj2)


 {


 NSString *strDateObj1 = [NSString stringWithFormat:@"%@",[obj1 valueForKey:@"BirthDate"]];


 NSString *strDateObj2 = [NSString stringWithFormat:@"%@",[obj2 valueForKey:@"BirthDate"]];


 NSDate *d1 = [df dateFromString: strDateObj1];


 NSDate *d2 = [df dateFromString: strDateObj2];


 return [d1 compare: d2];


 }];



NSLog ( @"%@",sortedArray

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