动态设置自动布局以在iOS中滚动视图

Question

i am creating scroll view dynamically now i want to set auto layout for that i implemented following code to set auto layout but its not working at all.

   - (void)viewDidLoad
   {
   [super viewDidLoad];
        self.navigationItem.title=@"Insta SMS Collection";
        scrollView = [[UIScrollView alloc]initWithFrame:self.view.frame];


    [self.view addSubview:scrollView];
    scrollView.translatesAutoresizingMaskIntoConstraints = NO;
    NSDictionary *views = @{@"scrollView":scrollView};
    [scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:  
    [scrollView]"
    options:kNilOptions
    metrics:nil
    views:views;
    [self.view addSubview:scrollView];
    }

Answer 1

add horizontal and vertical autolayout.

[self.view addSubview:scrollView];
NSDictionary *dictScrollConst = NSDictionaryOfVariableBindings(scrlView);
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[scrlView]|" options:0 metrics:nil views:dictScrollConst]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[scrlView]|" options:0 metrics:nil views:dictScrollConst]];

Maybe this will help you.