launch a webview programmatically from another view controller error - ios

Question

Here is my main view controller:
#import "ViewController.h"
#import "WebViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
WebViewController *wvc = [[WebViewController alloc]init];
[self presentViewController:wvc animated:NO completion:nil];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
Here is webviewcontroller:
#import "WebViewController.h"
#interface WebViewController ()
#end
#implementation WebViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
UIWebView *webview=[[UIWebView alloc]initWithFrame:CGRectMake(0, 0, 1024,768)];
NSString *url=#"https://www.google.com";
NSURL *nsurl=[NSURL URLWithString:url];
NSURLRequest *nsrequest=[NSURLRequest requestWithURL:nsurl];
[webview loadRequest:nsrequest];
[self.view addSubview:webview];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
The google page does not get loaded and the warning I get is
Warning: Attempt to present on
whose view is not in the window
hierarchy!
What the hell is going on?

Answer 1

I'd suggest double-checking. Following your code, I just confirmed this:
#import "LoadPresentViewController.h"
#import "WebViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (IBAction)doLoadPresent:(id)sender {
WebViewController *wvc = [[WebViewController alloc]init];
[self presentViewController:wvc animated:NO completion:nil];
}
- (void)viewDidLoad {
[super viewDidLoad];
// this fails in viewDidLoad
// WebViewController *wvc = [[WebViewController alloc]init];
// [self presentViewController:wvc animated:NO completion:nil];
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
// this succeeds in viewDidAppear
WebViewController *wvc = [[WebViewController alloc]init];
[self presentViewController:wvc animated:NO completion:nil];
}
#end