Fast enumerate NSDictionary with keys in order.

enumerate-dictionary.m

Example:
Input: 
@{
    1 = "A";
    2 = "B";
    3 = "C";
}

Output
@[
    @{@"key": 1, @"value": @"A"};
    @{@"key": 2, @"value": @"B"};
    @{@"key": 3, @"value": @"C"};
]

// Approach 1: Sort keys in order first -> insert object with sorted keys
    // Sort keys in order - Use 1 method below.
    NSArray *sortedKeys = [[dictionary allKeys] sortedArrayUsingSelector:@selector(compare:)];
    // OR
    NSArray *sortedKeys = [[dictionary allKeys] sortedArrayUsingComparator:^(id firstObject, id secondObject) {
        return [((NSString *)firstObject) compare:((NSString *)secondObject) options:NSNumericSearch];
    }];
    
    NSMutableArray *array = [[NSMutableArray alloc] initWithCapacity:[sortedKeys count]];
    for (id key in sortedKeys) {
        
        NSString *title = dictionary[key];
        if(![title isEqualToString:@""]) {
            [array addObject:title];
        }
    }
    
// Approach 2: Enumerate first -> sort array with keys in order.
    NSMutableArray *array = [[NSMutableArray alloc] init];
    [reasonsDic enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
        NSDictionary *dic = [[NSDictionary alloc] initWithObjects:@[key, obj] forKeys:@[@"key", @"title"]];
        [array addObject:dic];
    }];
    
    // Sort array of dictionary with value(s)
    NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"key"  ascending:YES];
    array = [[array sortedArrayUsingDescriptors:@[descriptor]] copy];