constraints

问题 My app is a game and the menus have many labels and buttons and I cannot get all of the different screen sizes(iPhone 4/5/6/6+) to look acceptable from the same set of constraints. Is there a way that you use to synchronize all the views together to look the same on all different screen sizes? The project is locked to only portrait so I don't need to consider rotation. 回答1: For Autolayout, you Consider the screen sizes you want to support. Which view/buttons/labels/imageview etc you want to

问题 I am a beginner in Python. I am using PuLP to solve a minimization problem for a Renewable Energy System (PV + Wind + Battery). My system uses timesteps (24h, per hour). My question is how can I create a list in the constraints that collects the state of charge of the battery, as well as the inlet and outlet of it (variables that change value each timestep). In mathlab I have seen people use "eye", but here in PuLP I am not sure how can be done. Any help would be very well appreciated. Here

问题 In my app I want to achieve this layout: So parent view contains two sub views. First one ends exactly in a middle (height / 2) and second starts in a middle of parent view. I have found out that it is impossible to do that in the IB with constraints. So I used this code in viewDidLoad method: NSLayoutConstraint *constraint = [NSLayoutConstraint constraintWithItem:firstView attribute:NSLayoutAttributeHeight relatedBy:0 toItem:self.view attribute:NSLayoutAttributeHeight multiplier:0.5 constant

问题 I am trying to find a maximum return for a simple portfolio using Solver. Using Solver in the worksheet directly works sensibly, however it does not when the commands are set in VBA. Instead (as you can see from the screengrab)it ignores one of the constraints (that the sum of weights calculated in T10 should =1). Interestingly it works fine if I change the third line to say: SolverAdd CellRef:="$T$10", Relation:=2, FormulaText:="100" Or any other integer other than "1". (It may also be

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . I am looking for a java library that could convert a logical expression wirtten in polish/prefix notation into an abstract syntax tree object and back. This is the syntax used by the SMT-LIB standard and CVC4 and I am trying to create some complex constraints. I don't want to evaluate the expression in any kind

问题 I have a very basic script to move the camera from the mouse position, but I want to constrain the rotation of the z axis to some values. With the code below it all works fine, but the camera can be rotated fully on the z axis, I want to limit it to 20 and -40. I have tried to use mathf.clamp but that didn't work and when printed to the console it only printed out the right most value in the mathf.clamp. I also tried using an if statement to see if the rotation was over the limit, and then to

问题 If I have a class like this: class Person (var name:String, var surname:String, var sons: Set[Person]) I want to have a control that a Person cannot contain herself between his sons and the sons of his sons. How can I do this? I had thought a recursive search. But I have to be careful not to create cycles. I can use a Boolean as a guard and just you find an item that contains itself stops searching. How can I implement this? Do you have ideas? Thank you very much. UPDATE Thank you very much

问题 A few days ago I asked a question titled How to constraint a generic to be of type enum?. To summarize the problem is the following code: class MyClass<T> where T : enum // Not possible in C# { } I was introduced to code contracts and that I could produce a compile time warning for the problem, which is all I want (to be informed at compile time that T should be an enum ). I tried the follwing code (Full source). class MyClass<T> { public MyClass() { Contract.Requires(typeof(System.Enum)

问题 I have the following tables: CREATE TABLE BOOK_AUTHORS (Book_id CHAR(20) NOT NULL, AuthorName VARCHAR(30) NOT NULL, PRIMARY KEY (Book_id, AuthorName), FOREIGN KEY (Book_id) REFERENCES BOOK (Book_id)); CREATE TABLE BOOK_COPIES (Book_id CHAR(20) NOT NULL, Branch_id CHAR(20) NOT NULL, No_of_copies NUMBER, PRIMARY KEY (Book_id, Branch_id), FOREIGN KEY (Book_id) REFERENCES BOOK (Book_id), FOREIGN KEY (Branch_id) REFERENCES LIBRARY_BRANCH (Branch_id)); I want to add ON DELETE CASCADE constraints to

问题 I want to make unique constraint in cassandra . As i want to all the value in my column be unique in my column family ex: name-rahul phone-123 address-abc now i want that i this row no values equal to rahul ,123 and abc get inserted again on seraching on datastax i found that i can achieve it by doing query on partition key as IF NOT EXIST ,but not getting the solution for getting all the 3 values uniques means if name- jacob phone-123 address-qwe this should also be not inserted into my