Ios 如何过滤多个字典的结构数组

我怎样才能在星期六到星期六

我试过下面的方法。 对这种结构进行排序/过滤的最佳方式是什么

NSArray *array = [NSArray arrayWithObject:[NSMutableDictionary dictionaryWithObject:@"filter string" forKey:@"updated_time"]];   // you can also do same for Name key... 
    NSArray *filteredarray = [array filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(email == %@)", @"filter string"]];

---

您需要将日期从

NSString

解析为

NSDate

对象，然后使用

NSCalendar

提取月份。这将帮助您：

NSArray *array = @[@{@"co_user_id": @25,
                     @"curr_timpestamp": @"2013-10-09 16:57:39",
                     @"id": @81,
                     @"status": @0,
                     @"story_title": @"Second Story",
                     @"updated_time": @"2013-10-12 05:32:13",
                     @"user_id": @24
                     },
                   @{@"co_user_id": @25,
                     @"curr_timpestamp": @"2013-10-09 16:57:39",
                     @"id": @82,
                     @"status": @0,
                     @"story_title": @"Second Story",
                     @"updated_time": @"2013-10-12 05:32:13",
                     @"user_id": @24
                     }];

// Create a basic date formatter to turn the strings into dates.
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
[formatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
// Create the calendar for retrieving date components.
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
// Set the month being filtered
NSInteger month = 10;
// Filter for dictionaries whose 'updated_time's have the same value as 'month'.
NSPredicate *predicate = [NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings) {
    NSDate *date = [formatter dateFromString:evaluatedObject[@"updated_time"]];
    return [[calendar components:NSMonthCalendarUnit fromDate:date] month] == month;
}];
// Print the filtered array.
NSLog(@"%@", [array filteredArrayUsingPredicate:predicate]);

尝试：

---

这充分利用了您的时间格式非常严格的优势。

过滤器是否位于

curr\u timestamp

或

updated\u time

中的月份值上？@DavidAtkinson-其on updated\u time如果不是字典中的键，为什么通过电子邮件进行过滤？

NSArray *array = @[@{@"co_user_id": @25,
                     @"curr_timpestamp": @"2013-10-09 16:57:39",
                     @"id": @81,
                     @"status": @0,
                     @"story_title": @"Second Story",
                     @"updated_time": @"2013-10-12 05:32:13",
                     @"user_id": @24
                     },
                   @{@"co_user_id": @25,
                     @"curr_timpestamp": @"2013-10-09 16:57:39",
                     @"id": @82,
                     @"status": @0,
                     @"story_title": @"Second Story",
                     @"updated_time": @"2013-10-12 05:32:13",
                     @"user_id": @24
                     }];

// Create a basic date formatter to turn the strings into dates.
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
[formatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
// Create the calendar for retrieving date components.
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
// Set the month being filtered
NSInteger month = 10;
// Filter for dictionaries whose 'updated_time's have the same value as 'month'.
NSPredicate *predicate = [NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings) {
    NSDate *date = [formatter dateFromString:evaluatedObject[@"updated_time"]];
    return [[calendar components:NSMonthCalendarUnit fromDate:date] month] == month;
}];
// Print the filtered array.
NSLog(@"%@", [array filteredArrayUsingPredicate:predicate]);

NSPredicate*    predicate = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"updated_time CONTAINS '-%02d-'", 10]];
NSArray*        result = [data filteredArrayUsingPredicate:predicate];