How to sort plist by its value - iphone

Question

I have Plist with list with List of Dictionaries(item0,item1,item2).and I populate this plist in the Graph..its works fine.and in Plist key (date)-> Value(i store by using NSDate) .Now I need to sort the Plist in such a way that:-
graph should display for only one week.
say if first value is 26-Dec-12 than only upto 1-Jan-13(1 week) values plist should display
.
code :
- (NSArray *)readFromPlist
{
// get paths from root direcory
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [documentPaths objectAtIndex:0];
NSString *documentPlistPath = [documentsDirectory stringByAppendingPathComponent:#"calori.plist"];
NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:documentPlistPath];
valueArray = [dict objectForKey:#"title"];
return valueArray;
}
and
- (void)drawRect:(CGRect)rect {
// Drawing code
CGContextRef _context = UIGraphicsGetCurrentContext();
ECGraph *graph = [[ECGraph alloc] initWithFrame:CGRectMake(10,10, 480, 320)
withContext:_context isPortrait:NO];
NSMutableArray *Array=[NSMutableArray arrayWithArray:[self readFromPlist]];
NSMutableArray *items = [[NSMutableArray alloc] init];
for (id object in [Array reverseObjectEnumerator]){
if ([object isKindOfClass:[NSDictionary class]])
{
NSDictionary *objDict = (NSDictionary *)object;
tempItemi =[[ECGraphItem alloc]init];
NSString *str=[objDict objectForKey:#"title"];
NSLog(#"str value%#",str);
float f=[str floatValue];
NSString*str1=[objDict objectForKey:#"date"];
NSLog(#" str values2-- %#",str1);
tempItemi.isPercentage=YES;
tempItemi.yValue=f;
tempItemi.name=str1;
[items addObject: tempItemi];
}
}
[graph drawHistogramWithItems:items lineWidth:2 color:[UIColor blackColor]];
}

Answer 1

As your requirement is to filter date within 7 days,
I am giving you a logic, try this way:
- (NSArray *)readFromPlistForOneWeek {
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [documentPaths objectAtIndex:0];
NSString *documentPlistPath = [documentsDirectory stringByAppendingPathComponent:#"calori.plist"];
NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:documentPlistPath];
//loop through each of the item
//and check if <8 then add that keyValue to array
NSMutableArray *tempValueArray=[NSMutableArray new];
for (NSDictionary *subDict in [dict objectForKey:#"title"]) {
// NSLog(#"=> %#",subDict);
NSString *plistDateString=[subDict objectForKey:#"date"];
NSDate *currentDate = [NSDate date];
NSDateFormatter *dateFormatter=[NSDateFormatter new];
[dateFormatter setDateFormat:#"dd-MMM-yy"];
NSDate *plistDate=[dateFormatter dateFromString:plistDateString];
NSString *currentDateString=[dateFormatter stringFromDate:currentDate];
NSTimeInterval secondsBetween = [plistDate timeIntervalSinceDate:currentDate];
NSInteger dateDiff = secondsBetween / 86400;
if( dateDiff<8 ){ //within 0-7 days
[tempValueArray addObject:subDict];
}
}
NSLog(#"valuArray : %#",tempValueArray);
return tempValueArray;
}

Answer 2

Have you tried with NSSortDescriptor?
NSSortDescriptor *sortDesc = [[NSSortDescriptor alloc] initWithKey:#"DATE" ascending:YES selector:#selector(compare:)];
[yourDictionary sortUsingDescriptors:[NSArray arrayWithObject:sortDesc]];

Answer 3

Try this
NSString *path = [[NSBundle mainBundle] pathForResource:#"yourfile" ofType:#"plist"];
NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:path];
// sort it
NSArray *sortedArray = [[myDict allKeys] sortedArrayUsingSelector:#selector(caseInsensitiveCompare:)];
// iterate and print results
for(NSString *key in sortedArray) {
NSLog(#"key=%#,value=%#", key, [dict objectForKey:key]);
}