Creating UIViewController's with subview programmatically [duplicate]

Question

I want to create a controller which has a UIWebView as a subview programmatically. I manage to do it with the following code:

VLUpdateViewController.h

@interface VLUpdateViewController : UIViewController

@property (nonatomic, strong) UIWebView* webView;

@end

VLUpdateViewController.m

@implementation VLUpdateViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    [self.view setBackgroundColor:[UIColor blueColor]];
    [self.view setTranslatesAutoresizingMaskIntoConstraints:NO];
    self.webView = [[UIWebView alloc] initWithFrame:self.view.frame];
    [self.webView setBackgroundColor:[UIColor redColor]];
    [self.webView setScalesPageToFit:YES];
    [self.view addSubview:self.webView];

    NSArray* constraints = [[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[webView]-0-|" options:0 metrics:nil views:@{@"webView" : self.webView}] arrayByAddingObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[webView]-0-|" options:0 metrics:nil views:@{@"webView" : self.webView}]];

    [self.view addConstraints:constraints];
}

However, my problem is that the webView doesn't resize properly when the orientation changes. In fact, it doesn't resize at all. it just rotates at the cent of the screen.

Portrait:

Landscape:

I tried omitting setTranslatesAutoresizingMaskIntoConstraints: but I got the following result when i changed the orientation to landscape.

Answer 1

I copy and pasted your code, and added the missing line:

self.webView.translatesAutoresizingMaskIntoConstraints = NO;

You had translatesAutoresizingMaskIntoConstraints = NO for your self.view but not your self.webView.

Final code:

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    [self.view setBackgroundColor:[UIColor blueColor]];
    [self.view setTranslatesAutoresizingMaskIntoConstraints:NO];
    self.webView = [[UIWebView alloc] initWithFrame:self.view.frame];
    [self.webView setBackgroundColor:[UIColor redColor]];
    [self.webView setScalesPageToFit:YES];



    // ---------------------------------------
    // this line is missing
    // ---------------------------------------
    self.webView.translatesAutoresizingMaskIntoConstraints = NO;



    [self.view addSubview:self.webView];

    NSArray* constraints = [[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[webView]-0-|" options:0 metrics:nil views:@{@"webView" : self.webView}] arrayByAddingObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[webView]-0-|" options:0 metrics:nil views:@{@"webView" : self.webView}]];

    [self.view addConstraints:constraints];

    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.google.com/"]];

    [self.webView loadRequest:request];
}