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Cant fill superview with view programmatically


Cant fill superview with view programmatically

By : user2949011
Date : November 15 2020, 06:54 AM
wish of those help I'll try to make subview's sizes same its superview. , Two mistakes (at least). First:
code :
subView.setTranslatesAutoresizingMaskIntoConstraints(true)


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Updating Constraints/Frames After a View is Programmatically Removed from Superview (Autolayout)

Updating Constraints/Frames After a View is Programmatically Removed from Superview (Autolayout)


By : user2075818
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , If you just have those 3 views, you can create a horizontal spacing constraint between 1 & 3. Edit it to give it the value you want after 2 is removed, and change its priority to less than 1000, like 900. So, 3 will have a spacing constraint to both 1 and 2, but the one to 2 will take precedence until view 2 is removed. If you have more than 3 views, it will get a bit more complicated, but you can use a similar method.
Expand Square View to Fill Rectangular Superview Using Auto Layout

Expand Square View to Fill Rectangular Superview Using Auto Layout


By : samy
Date : March 29 2020, 07:55 AM
should help you out Situations like this can often be solved by pairing an equality constraints at a reduced priority with an inequality at required priority.
So, for example, a constraint that the square's leading edge equal its superview's leading edge at priority 900 and a constraint that the square's bottom edge is less than or equal to its superview's bottom at required priority.
Centering a UIView programmatically using Autolayout makes the view disappear from superview

Centering a UIView programmatically using Autolayout makes the view disappear from superview


By : hyliandream
Date : March 29 2020, 07:55 AM
With these it helps I have the following code to simply center a red square using AutoLayout constraints programmatically in my ViewController's view: , Try to change your setupConstraints func to this :
code :
func setupConstraints() {

    self.square.translatesAutoresizingMaskIntoConstraints = false

    let centerX = NSLayoutConstraint(item: self.view, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal,toItem: self.square, attribute: NSLayoutAttribute.CenterX, multiplier: 1, constant:0)
    let centerY = NSLayoutConstraint(item: self.view, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal,toItem: self.square, attribute: NSLayoutAttribute.CenterY, multiplier: 1, constant:0)
    let squareWidth = NSLayoutConstraint(item: self.square, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant:500)
    let squareHeight = NSLayoutConstraint(item: self.square, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant:500)

    self.view.addConstraints([centerX , centerY ,squareWidth , squareHeight])

}
What constraints should I use to have an image view aspect fill the bottom half of its superview?

What constraints should I use to have an image view aspect fill the bottom half of its superview?


By : user6032830
Date : March 29 2020, 07:55 AM
Does that help As far as constraints go, you can set the image view's height equal to its superview's height then add a multiple of 0.5 to that constraint so that the image view is half the height of its superview; then align the right, left, and bottom margins to the superview's right, left and bottom margins.
To maintain the aspect ratio and fill the image view with the image, you can set the view's content mode to Aspect Fill.
code :
override func viewDidLayoutSubviews() {
    imageView.layer.contentsRect = CGRect(x: 0, y: 0, width: 1.0, height: 0.5)
}
How can I get a SwiftUI View to completely fill its superview?

How can I get a SwiftUI View to completely fill its superview?


By : user2927387
Date : March 29 2020, 07:55 AM
around this issue You need to watch WWDC 2019 Session 237: Building Custom Views with SwiftUI, because Dave Abrahams discusses this topic, and uses Text in his examples.
To restate briefly what Dave explains in detail:
code :
var body: some View {
    ZStack {
        Spacer()
        Text("Hello")
        }
        .background(Color.red)
}
struct ContentView: View {
    var body: some View {
        ZStack {
            Color.red
            Text("hello")
        }
    }
}
struct ContentView: View {
    var body: some View {
        Color.red
            .overlay(Text("foo"))
    }
}
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