autolayout

问题 I have a problem with making a self sizing UICollectionView with a cell that contains UITableView with a header that has a label with dynamic height. Can someone point me out to what I need to change in the attached sample project? You can see on the screenshot that the table does not fit the view as the cell's height is currently manually set. import UIKit class ViewController: UIViewController { static let section1 = "section1" static let section2 = "section2" private weak var

问题 I have a problem with making a self sizing UICollectionView with a cell that contains UITableView with a header that has a label with dynamic height. Can someone point me out to what I need to change in the attached sample project? You can see on the screenshot that the table does not fit the view as the cell's height is currently manually set. import UIKit class ViewController: UIViewController { static let section1 = "section1" static let section2 = "section2" private weak var

问题 I used CGAffineTransform to rotate a horizontal UIPageControl vertical. But when I added it besides my collection view it's taking too much width. And when I add a width anchor on it, the UIPageControl disappears. noticesPagingIndicator = UIPageControl() let angle = CGFloat.pi/2 noticesPagingIndicator.transform = CGAffineTransform(rotationAngle: angle) NSLayoutConstraint.activate([ // noticesPagingIndicator.widthAnchor.constraint(equalToConstant: 30), noticesPagingIndicator.leadingAnchor

问题 I just wasted an hour with what looks like an iOS 14 SDK regression when running on iOS 12 so I thought i'd post this in case it helps others. Summary : When pinning the frame of the UIScrollView with the frameLayoutGuide as we've always done, this breaks on iOS 12 when the scrollview is contained within another view (in my case in a child viewcontroller, not sure if that matters). Setup : View setup, all views using autolayout: UIView "scrollviewContainerView" [fixed/unchanging size] | \-

问题 I just wasted an hour with what looks like an iOS 14 SDK regression when running on iOS 12 so I thought i'd post this in case it helps others. Summary : When pinning the frame of the UIScrollView with the frameLayoutGuide as we've always done, this breaks on iOS 12 when the scrollview is contained within another view (in my case in a child viewcontroller, not sure if that matters). Setup : View setup, all views using autolayout: UIView "scrollviewContainerView" [fixed/unchanging size] | \-

问题 I created the NSView in a storyboard. In this case, it is an NSTextField . In the NSViewController 's viewDidLoad() method, I want to conditionally resize and reposition the NSTextField , but setting the frame has no effect. For example: class ViewController: NSViewController { @IBOutlet var label: NSTextField! override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. label.frame = NSRect(x: 0, y: 0, width: 200, height: 17) label.setNeedsDisplay() }

问题 I am using auto layout. I have one UIView that takes place at 20px margin from the center of the superview. Right now I have given the Top Space to superview that i have make in the iPhone 6+ Xib. but when i run in the iPhone 4 simulator it goes to too much down. Any idea 回答1: If you want the view to be placed relative to the center of the superview, you should be using centerX and/or centerY constraints, not a constraint to the top of the superview. In IB, if you choose the "Vertical Center

问题 I am trying to work an example code thats using the ' mixed approach ' mention on apple dev link: I am trying to stack 3 views vertically in UIScrollView. In below example the UIScrollView shows the red view on load but does not scroll as expected. I can scroll a little bit to see the green view below the red view - but the scroll view springs back up and does not scroll to the green view or view below it(blue view). I understand I need a constraint I tried to add one between view 1 & 2 so

问题 Every time I set the width of my view to my scroll view it pushes the green square off the screen. 回答1: @belgrim I had had a rough time working with scroll views. I would like to share my work around. First, drag a scroll view to your storyboard and pin in to four sides. Then, add a view inside the scroll view and pin it to the four sides of its superview (i.e. the scroll view) The result would look like this (Don't worry about the red markers, those will be fixes in the next steps) Add a

问题 I want to know if the keyboard is fully visible and not if it's in in-between states of presentation. Unfortunately, all the answers use UIKeyboardDidShow , UIKeyboardWillShow , or UIKeyboardWillChangeFrame to check if keyboard is visible. All of these trigger listeners multiple times as the keyboard appears. So I can't use any of them to definitively tell if the keyboard is fully visible. I want to know if the keyboard is fully visible and prevent an action from triggering in my