I have problem filtering an NSArrayController. Content Array is bound to an NSMutableArray holding NSDictionaries. I want to filter all NSDictionaries whose "name" key equals "a".
I run these two lines when my app launches but nothing gets filtered.
NSPredicate *filter = [NSPredicate predicateWithFormat: #"name like %#", #"a"];
[arrayController setFilterPredicate: filter];
NSPredicate *filter = [NSPredicate predicateWithFormat: #"name=%#", #"a"];
[arrayController setFilterPredicate: filter];
NSPredicate *filter = [NSPredicate predicateWithFormat:#"(name contains[cd] $a)"];
[arrayController setFilterPredicate: filter];
Related
Basically, what I want to do is this:
NSArray *objectsAtIndex1 = #[[#[#"Foo", #"Bar"] objectAtIndex:1]];
but using NSPredicate instead, so it would look something like this (however this is not working):
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"SELF[1] != null"]
NSArray *objectsAtIndex1 = [#[#"Foo", #"Bar"] filteredArrayUsingPredicate:predicate]
And of course, #"Foo" and #"Bar" are in reality unknown values (and could even be dictionaries or numbers). Is it possible to achieve this?
I solved it by using the predicateWithBlock: method on NSPredicate like this:
NSArray *fooBarArray = #[#"Foo", #"Bar"];
NSUInteger index = 1;
NSPredicate *predicate = [NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings) {
return [fooBarArray indexOfObject:evaluatedObject] == index;
}];
NSArray *objectsAtIndex1 = [fooBarArray filteredArrayUsingPredicate:predicate];
One caveat is however that the objects in fooBar-array needs to be unique for this to work, which is not perfect.
country=[[NSMutableArray alloc]initWithObjects:#"Afghanistan",
#"Albania",
#"Algeria",
#"American Samoa",
#"Andorra",
#"Angola",
#"Anguilla",
#"Antigua and Barbuda",
#"Argentina",
#"Armenia",
#"Aruba",
#"Ascension Island",
#"Australia",nil];
NSString *value=#"Al";
NSPredicate * predicate = [NSPredicate predicateWithFormat:#"SELF contains[cd] %#",value];
NSArray *filterValue = [country filteredArrayUsingPredicate:predicate];
I have a NSMutableArray with list of countries.I tried to filter values with NSPredicate.It is not working.What is wrong with my code?any help will appreicated.thanks in advance
It should be:
NSString *value=#"Al";
NSPredicate * predicate = [NSPredicate predicateWithFormat:#"SELF BEGINSWITH[cd] %#",value];
Notice that "value" is lowercase in both places that it's used.
Does the IN operator work for filtering SBElementArrays? I have been trying to use it but it always returns a NULL array.
My code (hexArray will typically have more elements):
SBElementArray *musicTracks = [libraryPlaylist fileTracks];
hexArray = [NSArray arrayWithObject: #"3802BF81BD1DAB10"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"ANY %K IN %#",#"persistentID",hexArray];
NSLog(#"%#", [[musicTracks filteredArrayUsingPredicate:predicate] valueForKey:#"persistentID"]);
NSLog(#"%#", hexArray);
NSLog(#"%#", predicate);
Output:
2013-05-26 12:59:29.907 test[1226:403] (null)
2013-05-26 12:59:29.907 test[1226:403] (3802BF81BD1DAB10)
2013-05-26 12:59:29.908 test[1226:403] ANY persistentID IN {"3802BF81BD1DAB10"}
I have tried setting the predicate to:
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"ANY %K == %#",#"persistentID",hexArray];
Output:
2013-05-26 13:03:04.629 test[1258:403] (3802BF81BD1DAB10)
2013-05-26 13:03:04.630 test[1258:403] (3802BF81BD1DAB10)
2013-05-26 13:03:04.630 test[1258:403] ANY persistentID == {"3802BF81BD1DAB10"}
And this works fine. But I would like the IN functionality.
Instead of doing
persistentID IN ('abc', 'abc', 'abc', ...)
you can do
persistentID == 'abc' OR persistentID == 'abc' OR ...
It seems to work pretty fast.
NSMutableArray *subPredicates = [NSMutableArray arrayWithCapacity:persistentIDs.count];
for (NSNumber *persistentID in persistentIDs) {
[subPredicates addObject:pred(#"persistentID == %#", persistentID.hexValue)];
}
NSPredicate *predicate = [NSCompoundPredicate orPredicateWithSubpredicates:subPredicates];
[tracks filterUsingPredicate:predicate];
NSLog(#"%ld", tracks.count);
Try using CONTAINS[c]
Ex:-
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"ANY %# CONTAINS[c] %k",hexArray, #"persistentID"];
I ended up just looping through all the elements of hexArray and using an equality predicate on each pass. Probably not the most efficient, but it works.
for (NSString *hexID in hexArray){
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"persistentID == %#",hexID];
iTunesTrack *track = [[musicTracks filteredArrayUsingPredicate:predicate] objectAtIndex:0];
[track duplicateTo:playlist];
}
Your predicate should be %K IN %# (without the ANY), if I understand your intention correctly (get all the tracks that have one of the IDs in the array).
For some reason, this doesn't work with SBElementArray, but you could simply convert it to a regular NSArray before applying the predicate (an NSSet should work too, and might be more efficient):
SBElementArray *musicTracks = [libraryPlaylist fileTracks];
NSArray *musicTracksArray = [NSArray arrayWithArray:musicTracks];
NSArray *hexArray = [NSArray arrayWithObjects: #"CE24B292556DB1BA", #"CE24B292556DB1F0", #"CE24B292556DB1C4", nil];
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"%K IN %#", #"persistentID", hexArray];
NSLog(#"%#", [[musicTracksArray filteredArrayUsingPredicate:predicate] valueForKey:#"persistentID"]);
Scripting Bridge technically supports the IN operator, in that it will construct a properly-formed Apple event for it, but most applications don't understand it. The best workaround is the chained OR tests as suggested by NSAddict.
I'm trying to filter a UITableView's data using a UISearchDisplayController and NSCompoundPredicate. I have a custom cell with 3 UILabels that I want to all be filtered within the search, hence the NSCompoundPredicate.
// Filter the array using NSPredicate(s)
NSPredicate *predicateName = [NSPredicate predicateWithFormat:#"SELF.productName contains[c] %#", searchText];
NSPredicate *predicateManufacturer = [NSPredicate predicateWithFormat:#"SELF.productManufacturer contains[c] %#", searchText];
NSPredicate *predicateNumber = [NSPredicate predicateWithFormat:#"SELF.numberOfDocuments contains[c] %#",searchText];
// Add the predicates to the NSArray
NSArray *subPredicates = [[NSArray alloc] initWithObjects:predicateName, predicateManufacturer, predicateNumber, nil];
NSCompoundPredicate *compoundPredicate = [NSCompoundPredicate orPredicateWithSubpredicates:subPredicates];
However, when I do this, the compiler warns me:
Incompatible pointer types initializing 'NSCompoundPredicate *_strong'
with an expression of type 'NSPredicate *'
Every example I've seen online does this exact same thing, so I'm confused. The NSCompoundPredicate orPredicateWithSubpredicates: method takes an (NSArray *) in the last parameter, so I'm REALLY confused.
What's wrong?
First of all, using "contains" is very slow, consider mayber "beginswith"?
Second, what you want is:
NSPredicate *predicate = [NSCompoundPredicate orPredicateWithSubpredicates:subPredicates];
Three, you could've just done something like:
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"SELF.productName beginswith[cd] %# OR SELF.productManufacturer contains[cd] %#", searchText, searchText];
orPredicateWithSubpredicates: is defined to return an NSPredicate*. You should be able to change your last line of code to:
NSPredicate *compoundPredicate = [NSCompoundPredicate orPredicateWithSubpredicates:subPredicates];
... and still have all of the compoundPredicates applied.
Here's an useful method i created based on the answers above (which i thank very much!)
It allows to create an NSPredicate dynamically, by sending an array of filter items and a string which represents the search criteria.
In the original case, the search criteria changes, so it should be an array instead of a string. But it may be helpful anyway
- (NSPredicate *)dynamicPredicate:(NSArray *)array withSearchCriteria:(NSString *)searchCriteria
{
NSArray *subPredicates = [[NSArray alloc] init];
NSMutableArray *subPredicatesAux = [[NSMutableArray alloc] init];
NSPredicate *predicate;
for( int i=0; i<array.count; i++ )
{
predicate = [NSPredicate predicateWithFormat:searchCriteria, array[i]];
[subPredicatesAux addObject:predicate];
}
subPredicates = [subPredicatesAux copy];
return [NSCompoundPredicate orPredicateWithSubpredicates:subPredicates];
}
I'm trying to perform a search on some results from a JSON feed that have been loaded into an NSArray called tableData and then displayed in a UITable.
The searchResults NSArray has been declared the .h file. The problem is that at the moment searchResults are empty and output nothing to the console. I'm not sure why...
I'm wondering if there's something missing from the
searchResults = [tableData filteredArrayUsingPredicate:resultPredicate];
line of code below
thanks for any help.
- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
NSPredicate *resultPredicate = [NSPredicate
predicateWithFormat:#"SELF contains[cd] %#",
searchText];
searchResults = [tableData filteredArrayUsingPredicate:resultPredicate];
NSLog(#"searchResults: %#", searchResults);
NSLog(#"tableData results: %#", tableData);
}
If you are looking for a field called 'cat' in your Dictionary, instead of having the predicate look in SELF, it should look in SELF.cat.
NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:#"SELF.cat CONTAINS[cd] %#", searchText];
If you still need to check other fields contained within the object, you can create a compound predicate. Details on Predicates can be found in Apple's Predicate Programming Guide.
Try to replace [cd] -> [c]:
NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:#"self.youProperty contains[c] %#", searchString];
like[cd] means “case- and diacritic-insensitive like.”