Create and Present modal view controller programmatically

问题

I am trying to programmatically declare a modal view controller from a view controller launched using storyboard. I would expect to see a blank view coming up but instead I only see the webview from the first controller.

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSString *fullURL = @"http://google.com";
    NSURL *url = [NSURL URLWithString:fullURL];
    NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
    _viewWeb.delegate=self;
    [_viewWeb loadRequest:requestObj];

    modalViewController=[[UIViewController alloc] init];
    [self presentViewController:modalViewController animated:YES completion:nil];
}

回答1:

You're doing this too soon. There's no interface yet, in viewDidLoad. Put that code into viewDidAppear: instead, and see what happens.

来源：https://stackoverflow.com/questions/15867447/create-and-present-modal-view-controller-programmatically