Question

目标是在Mac Os中显示通知（弹出+通知中心）。

尝试＃1。创建myclass.h + myclass.mm文件（使用OBJECTIVE_SOURCES）。我能够向通知中心添加通知。但是为了创建弹出窗口，我应该实现NSUserNotificationCenterDelegate：shouldPresentNotification。天真地实现该方法并将类作为委托传递引发编译时异常：这是* MyClass类型，而setDelegate方法需要id

尝试＃2。使用带有@interface指令的objective-c样式定义myclass，依此类推。不幸的是，编译器无法编译NSObject.h。看起来Qt中不支持class objective-c，我们不得不使用C ++类声明。

任何想法，如何在C ++类中实现给定的mac-os协议？

工作示例

MyClass.h

class MyClass
{
public:
    void test();
}

MyClass.mm

void MyClass::test()
{
  NSUserNotification *userNotification = [[[NSUserNotification alloc] init] autorelease];
  userNotification.title = @"Title";
  userNotification.informativeText = @"Test message";
  [[NSUserNotificationCenter defaultUserNotificationCenter] deliverNotification:userNotification];
}

尝试添加弹出窗口。在setDelegate方法中引发异常

MyClass.h

class MyClass
{
public:
    explicit MyClass();
    void test();
    BOOL shouldPresentNotification(NSUserNotificationCenter *center, NSUserNotification *notification);
}

MyClass.mm

MyClass::MyClass()
{
    [[NSUserNotificationCenter defaultUserNotificationCenter] setDelegate:this];
}

BOOL MyClass::shouldPresentNotification(NSUserNotificationCenter *center, NSUserNotification *notification)
{
    return YES;
}

void MyClass::test()
{
  NSUserNotification *userNotification = [[[NSUserNotification alloc] init] autorelease];
  userNotification.title = @"Title";
  userNotification.informativeText = @"Test message";
  [[NSUserNotificationCenter defaultUserNotificationCenter] deliverNotification:userNotification];
}

Answer 1

解决方案变得简单：您应该将此强制转换为必需的协议

MyClass::MyClass()
{
    id<NSUserNotificationCenterDelegate> self = (id<NSUserNotificationCenterDelegate>)this;
    [[NSUserNotificationCenter defaultUserNotificationCenter] setDelegate:self]; 
}

BOOL MyClass::shouldPresentNotification(NSUserNotificationCenter *center, NSUserNotification *notification)
{
    return YES;
}

void MyClass::test()
{
  NSUserNotification *userNotification = [[[NSUserNotification alloc] init] autorelease];
  userNotification.title = @"Title";
  userNotification.informativeText = @"Test message";
  [[NSUserNotificationCenter defaultUserNotificationCenter] deliverNotification:userNotification];
}

Qt中的Mac OS UserNotificationCenter

1 个答案: