parent-child

问题 OK, I have a RootViewController.m and defined a method in there: -(void)doSomethingParent { NSLog(@"Parent is doing something after child has asked"); } I then added a childViewController.view like so: if (self.child == nil) { ChildViewController *cvc = [[ChildViewController alloc] initWithNibName:nil bundle:nil]; self.child = cvc; [cvc release]; } [self.view insertSubview: child.view atIndex:0]; Now, I thought it would be very useful indeed if I could call my doSomethingParent method from

问题 I'm very new to c and programming and need some help. In c on linux(cygwin) I am required to remove all child processes at exit. I have looked at the other similar questions but can't get it to work. I've tried- atexit(killzombies); //in parent process void killzombies(void) { printf("works"); kill(0, SIGTERM); printf("works"); if (waitpid(-1, SIGCHLD, WNOHANG) < 0) printf("works"); } for some reason, "works" doesn't even print ever. I press ctrl + c to exit. ALSO I have tried- prctl(PR_SET

问题 I'm very new to c and programming and need some help. In c on linux(cygwin) I am required to remove all child processes at exit. I have looked at the other similar questions but can't get it to work. I've tried- atexit(killzombies); //in parent process void killzombies(void) { printf("works"); kill(0, SIGTERM); printf("works"); if (waitpid(-1, SIGCHLD, WNOHANG) < 0) printf("works"); } for some reason, "works" doesn't even print ever. I press ctrl + c to exit. ALSO I have tried- prctl(PR_SET

问题 I have tried to use different methods suggested in StackOverflow but I cannot make the following work. I have a nested ChildComponent into a ParentComponent. Here the HTML of the parent: <div> ... <div> <span *ngIf="value" class="option-button cursor-pointer" [attr.modelURL]="value" (click)="$event.stopPropagation();getParts(assemblyLibrary)"> <i class="fa fa-cube"></i> </span> <child-component></child-component> Obviously, I have imported the child component into the parent one: import {

问题 I have a child class which wants to add more functionality to a base class function, how can I represent that it also does the base class function not just the newly added functionality? 回答1: Interesting question. I tried that with Enterprise Architect. It did let me select the parent's operation but the display in the diagram did not change. It seems like you need to use notes for that: As you can see Class2 inherits from Class1 . The SD shows a call to Class2 's operation a() . The call to

问题 I defined a custom panel with a table layout panel inside. However when I used this control on a winform I do not have access to the table layout panel properties. (I want for instance add a column or dock an other control in a cell). I try to changed the modifier property to public, but it still does not work. What can I do in order to see and change the panel layout properties ? In fact, the question can be more generic : how to access/modify/move controls contained in a custom usercontrol

问题 If you drag any child element beyond any parent, its position is stored . This is a helluva lot . Element must go back to the previous parent. Child elements must be able to move within the parent and the parents . Parent elements must be able to move between them. problems: How to disable drag child elements abroad parents? How to enable parents to drag right? Now , if the example of the first parent to drag down to the place PARENT # 2 or PARENT # 3 , it will not move Code: <script type=

问题 I have this LESS setup: .wrapper { .parent { height: 100px; .children { //some style; &:hover { .parent & { height: 150px; } } } } } I need to change some height for parent element by hover on some child inside of it. This code is not working, so is there any possible to do this? Much thx for help. 回答1: Adding the :hover to the .parent instead of the .children div will achieve the result, http://codepen.io/duncanbeattie/pen/xvDdu .wrapper { .parent { pointer-events:none; height: 100px;

问题 After asking the question Call a method that requires a derived class instance typed as base class in VB.NET or C# on Stack Overflow, I was informed that I had used the wrong terms when asking the question. I had used "parent" and "child" where I should have used "base" and "derived" instead. I have been unable to find a good description of the difference. This is what I know (or think I know) so far: A parent class contains the child class. Where as a derived class inherits from a base class

问题 I'm working on a CMS system that receives urls like this: /parent1/parent2/child/ Now it's easy to check only the child but in my opinion you should also check if the parents are correct and in the right order. The problem is that I'm unsure on how to do this. I'm using mysql. this is how that table would look: CREATE TABLE IF NOT EXISTS `pages` ( `id` int(11) NOT NULL auto_increment, `parent` int(11) NOT NULL default '0', `title` varchar(255) NOT NULL, `deleted` tinyint(1) NOT NULL default