programmatically added uiview does not displayed - ios

Question

I'm trying to create a uiview programmatically and adding it to a stack_view which was also programmatically created and added to the view.
This is the code:
the .h
#interface ViewController : UIViewController
#property (strong, nonatomic, nullable) UIStackView * stack;
#end
the .m
#implementation viewController
#synthesize stack;
- (void) viewDidLoad {
[super viewDidLoad];
CGRect * vframe = self.view.frame;
// - Option 1
stack = [[UIStackView alloc] initWithFrame:CGRectMake(vframe.origin.x, 100,vframe.size.width,300)];
stack.axis = UILayoutConstraintAxisHorizontal;
stack.aligment = UIStackViewAligmentTop;
stack.distribution = UIStackViewDistributionFill;
[self.vew addSubview:stack];
// Option 2
// stack.traslateAutorezisingMaskIntoConstraints = NO;
// [stack.leadingAnchor constraintsEqualToAnchor: self.view.leadingAnchor].active = YES;
// [stack.topAnchor constraintsEqualToAnchor: self.view.topAnchor constant: 100].active = YES;
UIView * pView = [[UIView alloc] init];
pView.backgroundColor = [UIColor blueColor];
[stack addArrangedSubview:pView];
}
#end
This code does not show the view at all, I've tried to prove the option 2 (appeared commented in the code) and it does not work either. It is not supposed that the view, upon inserted in the stack, will get the size of the stack, since the distribution of it is "Fill"?. None of this work either even if I define Pview with frame=CGRectMakeRect(0,0,self.view.frame.size.width,100), for instance.
What am I doing wrong?
EDIT: I already fix the misspelled in the code (the * in the CGRect and the self.vew instead of self.view). I made these mistakes when I was manually copying the code, I did not copy and paste the code; tha's is why is made them and that's why the original code compile well

Answer 1

To diagnose this first test the pView. Init it with a fixed size like CGRectMake(100,100,100,100) and add it directly to the viewContoller's view. You should be able to see it no problem if not you have a deeper issue.
If that goes well try the UIStackView with a fixed size. Color its background to see it better if you need. If you still dont see it then double check it still has the correct frame in viewDidAppear of the viewController. It might have adjusted itself after creation. If that is correct go to Debug -> View Debugging -> Capture View Heirachy in Xcode after you have it up in the simulator. If you dont see it there then there was an issue adding it as a subview (note the typo [self.vew addSubview:stack];)
If that goes well then there is a problem with [stack addArrangedSubview:pView]. Similar to the previous step, loop through all the arrangedSubviews in UIStackView in viewDidAppear of its viewController.

Answer 2

CGRect vframe = self.view.frame;
In viewDidLoad, your self.view.frame has not been calculated yet. You need to do this in viewDidLayoutSubviews or viewDidAppear. both of these will get called multiple times so be careful.
EDIT:
As suggested below by danh (I overlooked it) you should remove * from the above line , also, you have several misspelling in your code, don't know how this code really even compiled for you.