在目标c中用日期月份和年份对日期数组进行排序

Question

我想对带有日期的数组进行排序，但是日期仅对日期和月份进行排序，而不对年份进行排序：

NSArray *sortedArray = [arrClassSehedule sortedArrayUsingComparator:^NSComparisonResult(NSDictionary *obj1, NSDictionary *obj2) {
    NSDate *d1 = [appSharedData.CommanFormatForConditional dateFromString: [obj1 objectForKey:@"scheduleStart"]];
    NSDate *d2 = [appSharedData.CommanFormatForConditional dateFromString: [obj1 objectForKey:@"scheduleStart"]];
    return [d1 compare: d2];
}];

按日期排序不正确。

Answer 1

问题出在d1上，您正在使用obj1，而d2上，您也在使用obj1。所以就像Lal Krishna所说的错字。这是固定版本：

NSArray *sortedArray = [arrClassSehedule sortedArrayUsingComparator:^NSComparisonResult(NSDictionary *obj1, NSDictionary *obj2) {
    NSDate *d1 = [appSharedData.CommanFormatForConditional dateFromString:[obj1 objectForKey:@"scheduleStart"]];
    NSDate *d2 = [appSharedData.CommanFormatForConditional dateFromString:[obj2 objectForKey:@"scheduleStart"]];
    return [d1 compare:d2];
}];

Answer 2

好像是错字。

请使用以下代码替换

 NSDate *d2 = [appSharedData.CommanFormatForConditional dateFromString: [obj2 objectForKey:@"scheduleStart"]];