autolayout

问题 I'm trying to create dynamically resizing table view cells. I accomplished the resizing by using this answer, which is very detailed and helpful. However, the maximum width for the label is not being calculated correctly in heightForRowAtIndexPath . My cell currently only has one label in its contentView , with constraints set to pin all the label edges to the contentView edges. Here's what I have in IB The cell size is being calculated with an offscreen cell in heightForRowAtIndexPath using

问题 I'm trying to create dynamically resizing table view cells. I accomplished the resizing by using this answer, which is very detailed and helpful. However, the maximum width for the label is not being calculated correctly in heightForRowAtIndexPath . My cell currently only has one label in its contentView , with constraints set to pin all the label edges to the contentView edges. Here's what I have in IB The cell size is being calculated with an offscreen cell in heightForRowAtIndexPath using

问题 I need to design different layouts for landscape and potrate I know how to design using .xib file but don't get how design different layout using storyboard. I want something like This but using storyboard. please help me. 回答1: You will need to create different views or different constraints for each screen layout. You can select the current screen layout here: And you can determine whether a view is going to be present (installed) in that screen layout here (look at the bottom): It should be

问题 I'm subclassing UITextField to add a label on the left side. I'm using autolayout to layout the label. However, I keep getting this crash: Here's how I am doing my layout code: - (void)updateConstraints { self.segmentLabel.translatesAutoresizingMaskIntoConstraints = NO; NSLayoutConstraint *constraint; constraint = [NSLayoutConstraint constraintWithItem:self.segmentLabel attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeHeight multiplier:1

问题 I started exploring SwiftUI and I can't find a way to get a simple thing: I'd like a View to have proportional height (basically a percentage of its parent's height). Let's say I have 3 views vertically stacked. I want: The first to be 43% (of its parent's height) high The second to be 37% (of its parent's height) high The last to be 20% (of its parent's height) high I watched this interesting video from the WWDC19 about custom views in SwiftUI (https://developer.apple.com/videos/play

问题 I started exploring SwiftUI and I can't find a way to get a simple thing: I'd like a View to have proportional height (basically a percentage of its parent's height). Let's say I have 3 views vertically stacked. I want: The first to be 43% (of its parent's height) high The second to be 37% (of its parent's height) high The last to be 20% (of its parent's height) high I watched this interesting video from the WWDC19 about custom views in SwiftUI (https://developer.apple.com/videos/play

问题 I am trying to present information about an object grouped into sections. It may be long, so each section uses a view to visually separate the areas and it is all in a scroll view. The first subview has a text field that does resize to fit the text, and its parent view also resizes to fit the text field. The second subview has a grouped table to display data. I want all of the data in the table to appear and there should be no table scrolling. The third subview has more information but its

问题 This is only an iOS 8 problem, the keyboard displays correctly in iOS 7 with device orientation change. My application supports both portrait and landscape orientation and uses autolayout. If I push a UIViewController subclass that contains a UITextField subclass onto a navigation stack and the UITextField becomes the first responder in portrait orientation then the default keyboard displays correctly. However, if I rotate the device to landscape orientation then the UIViewController subview

问题 I've used multipliers in my constraints, to size my views. However in my constraints for position I've used values, which I change for different sizing classes. However using regular / regular sizing classes for iPad Pro it's positions values aren't big enough, but for other iPads it's fine. I seriously don't have to add positioning views with multipliers to provide percentage spaces for all my views as well do I? 回答1: What we're after is to set the margin between the top of the screen and

问题 In my code below: I have 5 buttons added into a vertical scrollView. Each button is constrained to the scrollViews's top + 20 ,leading, trailing edges and its height. I have created a b1HeightConstraint variable. It's there to hold the heightConstraint of the b1 button. In a button click, I'm trying to remove this constraint. Yet I'm facing an odd issue: When I log the constraints I only see 2 constraints, even though I've added 4 constraints to it. My the view debug hierarchy is like below: