I have this array of names (listedName) that I want to filter out and remove in fbFriends array. How I can do it? Seems my clause is not working.
// add "names" to listed name array
NSMutableArray *aTempFriendList = [[NSMutableArray alloc] init];
for (int n = 0; n < [[self friendsList] count]; n++) {
NSDictionary *dFriend = [[self friendsList] objectAtIndex:n];
NSString *sName = [dFriend objectForKey:#"name"];
[aTempFriendList addObject:sName];
}
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"(name not in %#)", aTempFriendList];
[fbFriends filterUsingPredicate:predicate];
It should be #"not (name in %#)".
Related
My Array
(
{id:1,data:(#"macbook",#"mac mini")},
{id:2,data:(#"ipad",#"ipod")},
{id:3,data:(#"macbook",#"ipod")}
)
I have a predicate
NSString *text = #"mac";
[NSPredicate predicateWithFormat:#"(data contains[cd] %#)",text];
[array filteredArrayUsingPredicate:predicate];
but it doesn't loop over my array inside my dictionary
(my result should be an array containing 2 objects with id 1 and 3)
NSString* text = #"mac" ;
NSPredicate* predicate = [NSPredicate predicateWithFormat:#"any data contains[cd] %#",text] ;
NSArray* filteredArray = [theArray filteredArrayUsingPredicate:predicate] ;
I personally find NSPredicate formats very error prone.
You may consider using a block in order to filter your NSArray
NSString * filterString = #"mac";
NSIndexSet * indexes = [array indexesOfObjectsPassingTest:^BOOL(id obj, NSUInteger idx, BOOL *stop) {
NSArray * entry = obj[#"data"];
for (NSString * value in entry)
if ([value rangeOfString:filterString].location != NSNotFound)
return YES;
return NO;
}];
NSArray * filteredArray = [array objectsAtIndexes:indexes];
It's definitely longer and more verbose, but I find it definitely easier to read and debug.
I have a NSMutableArray like this :
(
{
City = "Orlando";
Name = "Shoreline Dental";
State = Florida;
},
{
City = "Alabaster ";
Name = Oxford Multispeciality;
State = Alabama;
},
{
City = Dallas;
Name = "Williams Spa";
State = Texas;
},
{
City = "Orlando ";
Name = "Roast Street";
State = Florida;
}
)
Now how can I sort this NSMutableArray to get the results corresponding to State "Florida"
I expect to get
(
{
City = "Orlando";
Name = "Shoreline Dental";
State = Florida;
},
{
City = "Orlando ";
Name = "Roast Street";
State = Florida;
}
)
I went for this code,but it displays again the prevous four dictionaries .
NSSortDescriptor *valueDescriptor = [[NSSortDescriptor alloc] initWithKey:#"Florida" ascending:YES];
NSArray * descriptors = [NSArray arrayWithObject:valueDescriptor];
NSArray * sortedArray = [arr sortedArrayUsingDescriptors:descriptors];
Try using a comparator block:
NSIndexSet *indices = [array indexesOfObjectsPassingTest:^(id obj, NSUInteger idx, BOOL *stop) {
return [[obj objectForKey:#"State"] isEqualToString:#"Florida"];
}];
NSArray *filtered = [array objectsAtIndexes:indices];
Alternatively, you can use a predicate as well:
NSPredicate *p = [NSPredicate predicateWithFormat:#"State = %#", #"Florida"];
NSArray *filtered = [array filteredArrayUsingPredicate:p];
If your array contains dictionary then you can use NSPredicate to filter out your array as follows:
NSPredicate *thePredicate = [NSPredicate predicateWithFormat:#"State CONTAINS[cd] Florida"];
theFilteredArray = [theArray filteredArrayUsingPredicate:thePredicate];
Assuming your array name is : arr
This one of the typical way to find, although a bit obsolete way....
for (NSDictionary *dict in arr) {
if ([[dict objectForKey:#"State"]isEqualToString:#"Florida"]) {
[filteredArray addObject:dict];
}
}
NSLog(#"filteredArray->%#",filteredArray);
Using predicates and blocks are already posted :)
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"State = %#", #"Florida"];
NSArray *filteredArray = [arr filteredArrayUsingPredicate:predicate];
NSLog(#"filtered ->%#",filteredArray);
I've been trying to filter this array (which is full of NSDictionaries) using NSPredicate...
I have a very small amount of code that just isn't working...
The following code should change label.text to AmyBurnett34, but it doesn't...
NSPredicate *pred = [NSPredicate predicateWithFormat:#"id = %#", [[mightyPlistDict objectForKey:#"pushesArr"] objectAtIndex:indexPath.row]];
NSLog(#"%#",pred);
label.text = [[[twitterInfo filteredArrayUsingPredicate:pred] lastObject] objectForKey:#"screen_name"];
NSLog(#"%#",twitterInfo);
And here is what gets NSLoged...
2012-08-05 11:39:45.929 VideoPush[1711:707] id == "101323790"
2012-08-05 11:39:45.931 VideoPush[1711:707] (
{
id = 101323790;
"screen_name" = AmyBurnett34;
},
{
id = 25073877;
"screen_name" = realDonaldTrump;
},
{
id = 159462573;
"screen_name" = ecomagination;
},
{
id = 285234969;
"screen_name" = "UCB_Properties";
},
{
id = 14315150;
"screen_name" = MichaelHyatt;
}
)
Just for the heads up if you also NSLog this... the array is empty...
NSLog(%#,[twitterInfo filteredArrayUsingPredicate:pred]);
The problem is that your predicate is using comparing with a string and your content is using a number. Try this:
NSNumber *idNumber = [NSNumber numberWithLongLong:[[[mightyPlistDict objectForKey:#"pushesArr"] objectAtIndex:indexPath.row] longLongValue]];
NSPredicate *pred = [NSPredicate predicateWithFormat:#"id = %#", idNumber];
You don't know for sure that the value of "id" is a string - it might be a NSNumber. I suggest:
NSUInteger matchIdx = ...;
NSUInteger idx = [array indexOfObjectPassingTest:^BOOL(NSDictionary *dict, NSUInteger idx, BOOL *stop)
{
id obj = [dict objectForKey:#"id"];
// NSLog the class if curious using NSStringFromClass[obj class];
NSUInteger testIdx = [obj integerValue]; // works on strings and numbers
return testIdx == matchIdx;
}
if(idx == NSNotFound) // handle error
NSString *screenName = [[array objectAtIndex:idx] objectForKey:#"screen_name"];
NSPredicate is used for filtering arrays, not sorting them.
To sort an array, use the sortedArrayUsingDescriptors method of NSArray.
An an example:
// Define a sort descriptor based on last name.
NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:#"lastName" ascending:YES];
// Sort our array with the descriptor.
NSArray *sortedArray = [originalArray sortedArrayUsingDescriptors:[NSArray arrayWithObjects:descriptor, nil]];
Hi the problem goes like this:
I have in CoreData entities that have a title and a relationship to keywords entities.
I need a predicate that helps me to fetch all those entities whose title contains the keywords I type. I have the code below that should do this but it doesn't:
NSArray *keywords = [searchString componentsSeparatedByString:#" "];
NSString *predicateString = #"";
for(NSInteger i = 0; i < [keywords count]; i++) {
if(((NSString*)[keywords objectAtIndex:i]).length != 0) {
if(i==0) {
predicateString = [keywords objectAtIndex:i];
}
else {
predicateString = [predicateString stringByAppendingFormat:#" and keywords.normalizedKeyword contains[cd] %#", [keywords objectAtIndex:i]];
}
}
}
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"keywords.normalizedKeyword contains[cd] %#",predicateString];
For example I have entities with titles like this:
1) "Great Coloring theme"
2) "Theme for kids"
3) "Cars for kids"
my keywords db will contain:
great
coloring
theme
for
kids
cars
How can I create a predicate so when I type for example:
Theme for
the result will be 2) and 3)
or if I type:
great theme
the result will be 1) and 2)
Any help in getting the right predicate to achieve this is very much appreciated. What I tried to do there it doesn't work and I am out of ideas.
Thanks!
I have found the answer myself. To solve such a problem you have to use a NSCompoundPredicate.
The solution to my problem was this:
NSArray *keywords = [lowerBound componentsSeparatedByString:#" "];
NSMutableArray *predicates = nil;
for(NSInteger i = 0; i < [keywords count]; i++) {
if(((NSString*)[keywords objectAtIndex:i]).length != 0) {
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"keywords.normalizedKeyword contains[cd] %#", [keywords objectAtIndex:i]];
if(predicates == nil) {
predicates = [[NSMutableArray alloc] initWithCapacity:0];
}
[predicates addObject:predicate];
}
}
NSPredicate *compoundPredicate = [NSCompoundPredicate andPredicateWithSubpredicates:predicates];
I'm building a NSPredicate using the code below for an iPhone app. The logging shows the prediate to be: location CONTAINS "head" AND shape CONTAINS "oval" AND texture CONTAINS "bumpy" AND colour CONTAINS "red"
I get no results. If I limit the predicate to a single item it will work, more than 1 fails.
Can anyone tell me why?
Many thanks
NSMutableArray *subPredicates = [[NSMutableArray alloc] init];
for (Ditem in self.tableDataSource) {
NSString *Title = [Ditem valueForKey:#"Title"];
NSString *Value = [Ditem valueForKey:#"Value"];
if([[Value lowercaseString] isEqualToString: #"all"]){
Value = #"";
}
else{
NSPredicate *p = [NSComparisonPredicate predicateWithLeftExpression:[NSExpression expressionForKeyPath:[Title lowercaseString]] rightExpression:[NSExpression expressionForConstantValue:[Value lowercaseString]] modifier:NSDirectPredicateModifier type:NSContainsPredicateOperatorType options:0];
[subPredicates addObject:p];
}
}
NSPredicate *predicate = [NSCompoundPredicate andPredicateWithSubpredicates:subPredicates];
NSLog(#"predicate: %#", predicate);[self.fetchedResultsController.fetchRequest setPredicate:predicate];
Your predicate is requiring that all of the values in your filterable objects be strings. Is that correct?
Also, I would simplify your subpredicate creation to:
NSPredicate * p = [NSPredicate predicateWithFormat:#"%K CONTAINS %#", [Title lowercaseString], [Value lowercaseString]];