CODEWITHSUNDEEP
iosobjective-cautolayout
Oneeb
Oneeb

Reputation: 75

Center the subview in UIView using constraints in IOS

i have three subview like subview1,subview2,subview3 in a UIViewController inside a UIView.

I'm using constraints on them, the constraints which i'm using to show then in a center when the button is clicked are these,

Issue :

When I run the app and click the button once it comes in the right position. But when i dismiss it and try again to open it, the subview change its position itself and comes on the top left of the UIViewcontroller ,

As you can see in a screen shot, but i want to show the view every time when i click the button in the center of the UIViewcontroller.

I'm confused that constraints are right but why it always changes its position when we open it again.

image

My code is ,

    - (IBAction)Precord:(id)sender {

       _DateView.hidden=NO;
        [self.DateView bounceIntoView:self.view direction:DCAnimationDirectionLeft];
    }

The contents in story board are like this , enter image description here

Upvotes: 0

Views: 758

Answers (3)

Deepika
Deepika

Reputation: 468

It depends on the way you are dismissing the View. I just tried below code and it worked for me

- (IBAction)btn_Tapped:(id)sender {
_smallView.hidden = false;
[_smallView bounceIntoView:self.view direction:DCAnimationDirectionLeft];
}
 - (IBAction)hide_Tapped:(id)sender {
_smallView.hidden = true;
}

Basically i am just hiding the view. And when btn_Tapped, everytime the view is displaying with bouncing animation in the center. Let me know how you go!

Upvotes: 1

alegelos
alegelos

Reputation: 2604

Simple way to programmatically add constrains. Modify it with your desire size.

Notice 1: toItem: self, where self is just a view where u added the subView.

Notice 2: SubView MUST be added to self or a subView of self.

subView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint(item: subView, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1.0, constant: 0).isActive = true
NSLayoutConstraint(item: subView, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1.0, constant: 0).isActive = true
NSLayoutConstraint(item: subView, attribute: .height,  relatedBy: .equal, toItem: self, attribute: .height,  multiplier: 0.5, constant: 0).isActive = true
NSLayoutConstraint(item: subView, attribute: .width,   relatedBy: .equal, toItem: self, attribute: .width,   multiplier: 0.5, constant: 0).isActive = true

I would recommend adding constrains in Storyboard. Easier to see/read, clear code and error validator.

On your problem i would say it a animation problem. Just before adding your view run again the method that set the view frames/constrains (to reset the animation position modification).

Or just when animation is finish, instead of hiding the view, remove it from super view. And when u need it again, just add it again.

Upvotes: 0

Vikas Rajput
Vikas Rajput

Reputation: 1874

try this 

yourSubView.center = CGPointMake(yourMainView.frame.size.width  / 2, 
                             yourMainView.frame.size.height / 2);

Upvotes: 0

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