keysSortedByValueWithOptions :usingComparator:
Returns an array of the dictionary’s keys, in the order they would be in if the dictionary were sorted by its values using a given comparator block and a specified set of options.
- (NSArray *)keysSortedByValueWithOptions:(NSSortOptions)optsusingComparator:(NSComparator)cmptr
Parameters
- opts
- A bitmask of sort options.
- cmptr
- A comparator block.
Return Value of [NSDictionary keysSortedByValueWithOptions]
An array of the dictionary’s keys, in the order they would be in if the dictionary were sorted by its values using cmptr with the options given in opts.
Example of [NSDictionary keysSortedByValueWithOptions]
NSArray *sortedKeys = [dictionary keysSortedByValueWithOptions:NSNumericSearch usingComparator:^NSComparisonResult(NSString *a, NSString *b){
return [a compare:b];
}];
//Now you have an array of sorted keys
NSMutableArray *sortedArray = [[NSMutableArray alloc] initWithCapacity:sortedKeys.count];
for (NSString *key in sortedKeys){
NSDictionary *dict = [NSDictionary dictionaryWithObject:[dictionary valueForKey:key] forKey:key];
[sortedArray addObject:dict];
}
//Now you have a sortedArray of key-value pairs