[英]Switching from native iOS gui to Qt gui
I currently have a native iOS GUI and a Qt-GUI. 我目前有一个原生的iOS GUI和一个Qt-GUI。 I'm trying to switch from one to another. 我正试图从一个切换到另一个。
To be clear: When i click on a button on the native GUI i want the Qt-GUI to show up and vice versa. 要明确:当我点击本机GUI上的按钮时,我希望Qt-GUI显示,反之亦然。
I already found out which libraries i have to add to be able to use the Qt-Stuff. 我已经找到了我必须添加哪些库才能使用Qt-Stuff。 I created a QApplication
in the AppDelegate.mm
file: 我在AppDelegate.mm
文件中创建了一个QApplication
:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *) launchOptions {
// receive int argc, and char** argv for the QApplication.
_qApp = new QApplication(_argc, _argv);
}
Furthermore my Qt application looks (at the moment) like this: 此外,我的Qt应用程序看起来(此刻)像这样:
void createQtGUI() {
QPushButton* btn = new QPushButton("Some Button");
QLabel* lbl = new QLabel("QTGui");
QVBoxLayout* layout = new QVBoxLayout();
layout->addWidget(lbl);
layout->addWidget(btn);
QWidget* window = new QWidget();
window->setLayout(layout);
window->show();
}
I'm calling the createQtGUI
method in my ViewController.mm
when pressing a button in the native iOS GUI. 当我在本机iOS GUI中按下按钮时,我在我的ViewController.mm
调用createQtGUI
方法。 The code runs without throwing any error, but: 代码运行时不会抛出任何错误,但是:
The Qt-GUI is not shown. Qt-GUI未显示。 The application still shows the native gui without switching to the Qt-GUI. 应用程序仍然显示本机gui而不切换到Qt-GUI。
Has anybody got any idea how to fix that? 有谁知道如何解决这个问题?
I've finally found out what was missing: 我终于找到了遗漏的东西:
The Qt-Objects provide a method called winId()
. Qt-Objects提供了一个名为winId()
的方法。 This method returns a WId
which actually is (on iOS) an UIView*
. 这个方法返回一个实际上是(在iOS上) UIView*
的WId
。
You have to add that UIView*
as Subview to your main view. 您必须将UIView*
作为Subview添加到主视图中。
In order to achieve that I changed my createQtGUI
method as follows: 为了实现这一点,我改变了我的createQtGUI
方法,如下所示:
WId createQtGUI() {
... // nothing changed here (only at the end)
window->show();
return window->winId();
}
And In my ViewController.mm
(where I call my method): 在我的ViewController.mm
(我调用我的方法):
- (IBAction)ButtonClicked:(id)sender {
UIView* newView = (__bridge UIView*)reinterpret_cast<void*>(createQtGUI());
[self.view addSubview:newView];
}
Note: The double cast (__bridge UIView*)reinterpret_cast<void*>(...)
is necessary because you can't just cast from WId
to UIView*
in Objective-C++. 注意:双重演员(__bridge UIView*)reinterpret_cast<void*>(...)
是必要的,因为你不能在Objective-C ++中从WId
为UIView*
。
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