从特定值开始排序字典数组

我能想到的最简单的方法是排序块。然后可以手动调整数组比较值。这应该适用于 Category 。您可能需要更改大于符号或升序/降序返回,我总是会混淆升序/降序。。。

NSArray *array;
NSString *userSelectedValue = @"C";
array = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    NSString *category1 = [[(NSDictionary*)obj1 objectForKey:@"Category"] lowercaseString];
    NSString *category2 = [[(NSDictionary*)obj2 objectForKey:@"Category"] lowercaseString];

    //Now check if either category's value is less than the user selected value
    NSComparisonResult result1 = [category1 compare:[userSelectedValue lowercaseString]];
    NSComparisonResult result2 = [category2 compare:[userSelectedValue lowercaseString]];

    if(result1 == result2)
    {
        return [category1 compare:category2];
    }
    else if(result1 > result2)
    {
        return NSOrderedDescending;
    }
    else
        return NSOrderedAscending;
}];