CODEWITHSUNDEEP
iosuiviewcontroller
RegularExpression
RegularExpression

Reputation: 3541

Centering UIView

I have a UIViewController subclass that instantiates a UIView subclass (let's call that viewA). Then, viewA will sometimes instantiate another UIView which we'll call viewB.

I want viewB to be centered within the view controller.

My question is, "What is a (correct) way of doing this?"

TIA

Upvotes: 0

Views: 78

Answers (4)

Paul.s
Paul.s

Reputation: 38728

You have to be careful to not end up on a fraction of a point. On non-retina you need to be on full points but for retina you can be on 0.5

One way would be to use center and then adjust

viewB.center = viewA.center;
viewB.frame = CGRectIntegral(viewB.frame);

Upvotes: 1

xapslock
xapslock

Reputation: 1129

There are many correct ways, but maybe the best one is to use the center-property:

[viewB setCenter: viewA.center];

Or maybe you need to use.. 

[viewB setCenter: viewA.navigationController.center];

Upvotes: 1

David Hoerl
David Hoerl

Reputation: 41652

viewB.frame = [MyClass centeredFrameForSize:desiredSize inRect:viewA.bounds];


+ (CGRect)centeredFrameForSize:(CGSize)size inRect:(CGRect)rect
{
    CGRect frame;
    frame.origin.x = rintf((rect.size.width - size.width)/2) + rect.origin.x;
    frame.origin.y = rintf((rect.size.height - size.height)/2) + rect.origin.y;
    frame.size = size;

    return frame;
}

Upvotes: 0

guenis
guenis

Reputation: 2538

I don't know a shorter way to do it than this one:

CGFloat x = CGRectGetMidX(self.view.bounds) - viewBWidth / 2;
CGFloat y = CGRectGetMidY(self.view.bounds) - viewBHeight / 2;

viewB.frame = CGRectMake(x,y,viewBWidth,viewBHeight);

Upvotes: 0

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