state

问题 I'm trying to restore the state of my multi-tabbed iPhone application. There are more than 5 tabs, each with it's own navigation controller. On applicationDidFinishLaunching, I determine which was the last tab the user was on and set it with myTabController.selectedIndex = persistedTabIndex; I then call a function on that tab's root view controller to restore itself. The problem is, if the tab has been moved to the "More" page, the view has not been loaded and the call disappears into NIL

问题 I have one stream is going to store the state, and I hope another stream can retrieve the state. Is this possible? I have tried in my unit test that seems like doesn't work. 回答1: It is currently not possible that different streams share state. Even different operators which belong to the same stream are not able to share state. The only thing you could play with is to use static fields to share state across different threads and thus also streams. But this only works if different tasks are

问题 I have one stream is going to store the state, and I hope another stream can retrieve the state. Is this possible? I have tried in my unit test that seems like doesn't work. 回答1: It is currently not possible that different streams share state. Even different operators which belong to the same stream are not able to share state. The only thing you could play with is to use static fields to share state across different threads and thus also streams. But this only works if different tasks are

问题 I'm working on a template for dynamic questionnaires in Flex. More detailed description in my previous thread HERE To create the questionnaire, I use nested repeaters - one for the questions and one for the answers (as their amount may vary). <mx:Repeater id="r" dataProvider="{questions}"> <mx:Label text="{r.currentItem.question}" width="200"/> <mx:Repeater id="r2" dataProvider="{r.currentItem.answers}"> <mx:RadioButton label="{r2.currentItem.text}" width="200" click="answerHandler(event,

问题 I need to start a thread that calls a public member function of the class Foo while inside of a public function that belongs to the class Bar. How do I achieve this? I have tried the following (made trivial): void Bar::BarFunc() { // Do some BarFunc stuff // Start a thread that needs to do stuff independently of BarFunc std::thread t(&Foo::FooFunc, FooFunc params,..,.., ???); t.detach(); return; } This is my first time dealing with threading and the actual problem is a little more complex -

问题 With a UIControl such as a UIButton you can use something like myControl.state to figure out whether the control is currently being pressed down. However, I need to do the same with some UIBarButtonItems (which are not derived from UIControl ), so that I can stop my table from editing while one of them is pressed down. Here's my code: - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath { //other checks for(int b=0; b<self.toolbar.items.count; b++) {

问题 So when I run my program, and hit the maximize button up in the right corner, my window resizes, but all my controls stay the same size in the page... If I click a corner or edge of my window and drag to resize, the controls re-size as I would expect. I have tried playing with the onStateChange handler, but it has not done anything. Anyone have any ideas how to make controls resize when I maximize my window? Thanks! 回答1: When you click on a control, do you see that each side has either a

问题 Here's a common situation: you have a form and you're interested in the submissions of that form. You may add a wrinkle to the situation by adding a server-side validator, or even a client-side validator, but the validators are only provided as a means of ensuring the input you submit is valid at that instance; any state collected between 0 and submission is thrown away and incidental. Here's a less-common situation: your form has a password/confirm field that you need to wire to work in the

问题 I have an app where I am trying to allow users to update the text of a "task/to-do" item. When the user hits the "edit" button, the edit component renders properly, but the input fields don't allow editing. I'm suspicious I'm not passing props properly or updating state properly, but the React tab of the Chrome dev tools seems to have things right... Here's the first part of the component: class Task extends Component { constructor(props) { super(props) this.state = { editingTask: false, id:

问题 I have an app where I am trying to allow users to update the text of a "task/to-do" item. When the user hits the "edit" button, the edit component renders properly, but the input fields don't allow editing. I'm suspicious I'm not passing props properly or updating state properly, but the React tab of the Chrome dev tools seems to have things right... Here's the first part of the component: class Task extends Component { constructor(props) { super(props) this.state = { editingTask: false, id: