UIAlertViewController's alert modal cannot be dismissed by adding UIAlertAction - ios

Question

I almost read all related articles here but still cannot get the alert dismissed. Can anyone help? It shouldn't be that hard...
P.S. in the defaultAction callback, I tried both:
[self dismissViewControllerAnimated:YES completion:^{
NSLog(#"ok...");
}];
and
NSLog(#"ok...");
Both are out of luck
My code:
#import "ViewController.h"
#interface ViewController ()
#property (strong, nonatomic) UIAlertController *alert;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidAppear:(BOOL)animated {
UIAlertController* alert = [UIAlertController alertControllerWithTitle:#"Reminder"
message:#""
preferredStyle:UIAlertControllerStyleAlert];
self.alert = alert;
self.alert.message = #"You just logged in. The tab will be refreshed";
UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:#"OK" style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
[self dismissViewControllerAnimated:YES completion:^{
NSLog(#"webview is reloading...");
}];
}];
[self.alert addAction:defaultAction];
[self presentViewController:self.alert animated:YES completion:nil];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end

Answer 1

It will dismiss it self.If you
[self dismissViewControllerAnimated:YES completion:^{
NSLog(#"webview is reloading...");
}];
use then it will dismiss the your current View contrtoller where alert controller present after dismiss it show the Log.
- (void)viewDidAppear:(BOOL)animated
{
UIAlertController* alert = [UIAlertController alertControllerWithTitle:#"Reminder" message:#"" preferredStyle:UIAlertControllerStyleAlert];
self.alert = alert;
self.alert.message = #"You just logged in. The tab will be refreshed";
UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:#"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * action)
{
NSLog(#"Ok button pressed..");
NSLog(#"webview is reloading...");
}];
}];
[self.alert addAction:defaultAction];
[self presentViewController:self.alert animated:YES completion:nil];
}

Answer 2

Close. you just have to make a slight adjustment.
- (void)viewDidAppear:(BOOL)animated {
self.alert = [UIAlertController alertControllerWithTitle:#"Reminder"
message:#"You just logged in. The tab will be refreshed"
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:#"OK" style:UIAlertActionStyleCancel handler:^(UIAlertAction * action) {
//alert dismisses itself
}];
[self.alert addAction:defaultAction];
[self presentViewController:self.alert animated:YES completion:nil];
}