How can I horizontally center a UIView?

Question

How can I make UIView horizontally centered and 30px from the top of the view controller using CGRectMake ?

var draggableView: DraggableView = DraggableView(frame:CGRectMake(0 , 30, 260, 260))
draggableView.center = center

Answer 1

斯威夫特 3;

subView.center.x = view.center.x

Answer 2

Try:

let size = 260
let screenWidth = self.view.frame.size.width

let frame = CGRectMake((screenWidth / 2) - (size / 2), 30, size, size)
let draggableView = DraggableView(frame: frame)

self.view.addSubview(draggableView)

Answer 3

You cannot center a view in a view controller, because a view controller is not a view and doesn't have a coordinate system.

You can center a view relative to another view. Presumably you want to center draggableView relative to the view controller's view. Assuming self is the view controller, and draggableView will be a direct subview of the view controller's view:

var draggableView: DraggableView = DraggableView(frame:CGRectMake(0 , 30, 260, 260))
self.view.addSubview(draggableView)
draggableView.center = self.view.center

Answer 4

Although Rob Mayoff is correct, it might be worthwhile to consider centering your frame in viewWillLayoutSubviews , which is called upon device rotation. You can also use the properties center.x and center.y of center to align based on axis. No need to call self in this instance.

override func viewWillLayoutSubviews() {
    draggableView.center = view.center
}

Answer 5

I am using the ' MMMaterialDesignSpinner ' library and creating a custom activity indicator in center of view. It's working correctly, you can change your custom view name like 'DraggableView'. I hope it's usable by you. This code is added into the viewDidLoad function in swift 3.

var loader = MMMaterialDesignSpinner()
let size:CGFloat = 40.0
let screenWidth = self.view.frame.size.width
let screenHeight = self.view.frame.size.height

loader = MMMaterialDesignSpinner(frame: CGRect(x: (screenWidth / 2) - (size / 2), y: (screenHeight / 2) - (size / 2), width: size, height: size))

loader.tintColor = UIColor.blue
loader.lineWidth = 4.0
loader.lineCap = kCALineCapRound;
view.addSubview(loader)

Answer 6

Swift 5

// in viewDidLoad or viewWillLayoutSubviews
draggableView.frame.origin.x = view.bounds.midX - draggableView.bounds.midX

Answer 7

This is a neat little extension for centering a view or object:

extension CGPoint {
    static var Center: CGPoint {
        return CGPoint(x: UIScreen.main.bounds.maxX/2, y: UIScreen.main.bounds.maxY/2)
    }
}

And then use it like this:

textField.center = CGPoint.Center

Answer 8

activityindicater is the view which you want to put in the center

self.activityindicater.center = self.baseView.center