Can anyone show me how to sort an array(NSMutableArray) of NSDate in order for the actual dates?
Thanks!
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2 Answers
I believe you want to use something like -NSMutableArray sortUsingSelector: and pass in @selector(compare:). Ie, assuming you had an NSMutableArray of NSDates named *dateArray*:
[dateArray sortUsingSelector:@selector(compare:)];
1 Comment
Heuristic
Thanks this method is useful, but for compare: selector, there is only one argument, something like compare:(NSDate *)other, but I need another date to compare.
Here you go just modify some part of code for your requirement
- (NSArray *)sortedWeightEntriesByWeightDate:(NSArray *)unsortedArray {
NSMutableArray *tempArray = [NSMutableArray array];
NSMutableArray *sortedArray = [NSMutableArray arrayWithCapacity:0];
@try {
for(int i = 0; i < [unsortedArray count];i++) {
NSDateFormatter *df = [[NSDateFormatter alloc]init];
MyDataModal *entry = [unsortedArray objectAtIndex:i];
[df setDateFormat:@"yyyy-MM-dd"];
NSDate *date = [df dateFromString:entry.weightDate];
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
if(date) {
[dict setObject:entry forKey:@"entity"];
[dict setObject:date forKey:@"date"];
[tempArray addObject:dict];
}
[df release];
}
NSInteger counter = [tempArray count];
NSDate *compareDate;
NSInteger index;
for(int i = 0 ; i < counter; i++) {
index = i;
compareDate = [[tempArray objectAtIndex:i] valueForKey:@"date"];
NSDate *compareDateSecond;
for(int j = i+1 ; j < counter; j++) {
compareDateSecond=[[tempArray objectAtIndex:j] valueForKey:@"date"];
NSComparisonResult result = [compareDate compare:compareDateSecond];
if(result == NSOrderedDescending) {
compareDate = compareDateSecond;
index=j;
}
}
if(i!=index)
[tempArray exchangeObjectAtIndex:i withObjectAtIndex:index];
}
NSInteger counterIndex = [tempArray count];
for(int i = 0; i < counterIndex ; i++) {
[sortedArray addObject:[[tempArray objectAtIndex:i] valueForKey:@"entity"]];
}
}
@catch (NSException * e) {
NSLog(@"An exception occured while sorting weight entries by date");
}
@finally {
return [NSArray arrayWithArray:sortedArray];
}
}
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