constraints

问题 I want to implement autolayout to set six square images that are always be in square even if screen size is changed. I have tried too many variations but fail to do so. In attached image i share sample view that autolayout will be applied. 回答1: You don't need any view wrappers or other funny business here, you can do it purely within IB or AL constraints between each item. The 'trick' is to think about the relationships between each item and to use both constants and multipliers. Each square

问题 This probably isn't a very nice question as its blending business logic with DB structure, but its not my decision so: Is it possible to define a constraint the infers the value of one column (Table A, Column X) cannot be greater than the value of another (Table B, Column Y) referenced via a foreign key: TABLE_A ID (Primary Key) X (int value) TABLE_B A_ID (Foreign Key to TABLE_A) Y (int value) i.e. I want to enforce that for all values of Y, Y < L where L is a value from X where TABLE_B.A_ID

问题 I am new to optplanner and playing around with using it to solve a timetabling problem however after all the setup, when I try to solve the problem, I get the following error: java.lang.IllegalStateException: The selectionList contains 2 times the same selection (c0001{t000}-0 @ null + null) and (c0001{t000}-1 @ null + null). at org.optaplanner.core.impl.heuristic.selector.common.decorator.WeightFactorySelectionSorter.sort(WeightFactorySelectionSorter.java:58) at org.optaplanner.core.impl

问题 i'm having trouble with some tables here. i have this table: CREATE TABLE `smenuitem` ( `nome` VARCHAR(150) NULL DEFAULT NULL COLLATE 'utf8_unicode_ci', `url` VARCHAR(150) NULL DEFAULT NULL COLLATE 'utf8_unicode_ci', `tipo` CHAR(4) NULL DEFAULT NULL COLLATE 'utf8_unicode_ci', `ordemmenu` INT(10) NULL DEFAULT NULL, `codparent` INT(10) UNSIGNED NOT NULL, `codmenuitem` INT(10) UNSIGNED NOT NULL, `codmodulo` INT(10) UNSIGNED NOT NULL, PRIMARY KEY (`codmodulo`, `codmenuitem`, `codmenuitem2`),

问题 Does Constraint error or warning influence publish app to app store? Since it sometimes does not matter for running in simulator or device. Thanks!! 回答1: If you are talking about pure layout exception in the debugger, the answer is NO if the app is still usable and doesn't crash. Saying that if your layout exceptions break something in the UI that makes difficult the use of it, you have a chance of rejection. I do agree with Bryan comment, if you know you have a bug fix it as soon as possible

问题 I'm trying to constrain a couple of views within a controller. I understand how to set spacing between views, and width/height for each view. I'm a little unsure about dynamic height and width, I'm assuming that it's the margin-locks duty to adjust the weight appropriately. Advice on this would be much appreciated. Anyways, I'm trying to set a "Trailing Space to: Superview" constraint, which automatically sets to -16. See photo: As you can see, I've selected margins for left right and top of

问题 I am getting one weird issue, I am setting constraints on the view using storyboard as below: But if I am accessing all applied constraint by code then always getting zero (0). for self.view it's returning the constraint but for yellow view getting zero. 回答1: Use this code (Swift 4+ and Xcode 9.4.1) import UIKit class ViewController: UIViewController { @IBOutlet var subView: UIView! override func viewDidLoad() { super.viewDidLoad() print(self.view.getAllConstraints().count) print(self.subView

问题 I am using quadprog to find a portfolio of optimal weights. So far, I have managed to implement long-only and short-only constraints as follows: FirstDegree = zeros(NumAssets,1); SecondDegree = Covariance; Long only Aeq = ones(1,NumAssets); beq = 1; A = -eye(NumAssets); b = zeros(NumAssets,1); x0 = 1/NumAssets*ones(NumAssets,1); MinVol_Weights = quadprog(SecondDegree,FirstDegree,A,b,Aeq,beq,[],[],x0, options); Short-only Aeq = ones(1,NumAssets); beq = -1; A = eye(NumAssets); b = zeros

问题 Given the following xml: <ImageView android:id="@+id/someTag" android:layout_width="10dp" android:layout_height="10dp" android:layout_marginBottom="12dp" android:layout_marginStart="8dp" android:tag="someTag" app:layout_constraintBottom_toTopOf="@+id/someID" app:layout_constraintStart_toEndOf="@+id/someID" I would like to know how to get the id of app:layout_constraintBottom_toTopOf (namely "someID") programatically. Many thanks! 回答1: That attribute value is held in the ImageView 's

问题 I have added min font size to label but the font is not changing according to the screen size. I thought setting min font size and using autolayout is to scale the label height is enough. But its not happening. 回答1: Use minimum font scale instead of minimum font size. Minimum font size was deprecated in IOS 6. In the image although mine says fixed here you can change that and then set the scale factor. To vary by size of the screen you can do some of that with interface builder. See image.