objectsForKeys notFoundMarker
Returns the set of objects from the dictionary that corresponds to the specified keys as an NSArray.
Parameters
- keys
- An
NSArraycontaining the keys for which to return corresponding values. - anObject
- The marker object to place in the corresponding element of the returned array if an object isn’t found in the dictionary to correspond to a given key.
Discussion of [NSDictionary objectsForKeys notFoundMarker]
The objects in the returned array and the keys array have a one-for-one correspondence, so that the nthe object in the returned array corresponds to the nthe key in keys.
Example of [NSDictionary objectsForKeys notFoundMarker]
NSArray *section0Keys = [NSArray arrayWithObjects:@"city", @"phone", @"email", nil];
NSMutableArray *section0 = [[[feedDictionary objectsForKeys:section0Keys notFoundMarker:[NSNull null]] mutableCopy] autorelease];
if ([section0 indexOfObject:[NSNull null]] != NSNotFound) {
isValid = NO;
}
// you don't need this if you don't care for invalid arrays.
[section0 removeObjectsInArray:[NSArray arrayWithObject:[NSNull null]]];
NSArray *section1Keys = [NSArray arrayWithObjects:@"year", @"degree", nil];
NSMutableArray *section1 = [[[feedDictionary objectsForKeys:section1Keys notFoundMarker:[NSNull null]] mutableCopy] autorelease];
if ([section1 indexOfObject:[NSNull null]] != NSNotFound) {
isValid = NO;
}
[section1 removeObjectsInArray:[NSArray arrayWithObject:[NSNull null]]];
self.dataArray = [NSArray arrayWithObjects:
section0,
section1,
nil];
Example of [NSDictionary objectsForKeys notFoundMarker]
[[dictionary objectsForKeys:[NSArray arrayWithObject:@"myKey"]
notFoundMarker:@"defaultValue"]
objectAtIndex:0]
Example of [NSDictionary objectsForKeys notFoundMarker]
NSMutableArray *objects = [myDictionary objectsForKeys:myKeys notfoundMarker:[NSNull null]];
for (int ii = 0; ii < [objects count]; ii++ ) {
if ([objects objectAtIndex:ii] == [NSNull null]) {
[objects insertObject:[myKeys objectAtIndex:ii] atIndex:ii];
}
}