在 iOS 13 中将静态委托设置为 UIApplication (objective-c)

Question

I'm don't know objective-c very well and i am trying to define an app delegate to use it in other classes.

after searching and according to some examples i found that i have to create an static property to save delegate in that:

.h:
@interface AppDelegate : UIResponder <UIApplicationDelegate, UNUserNotificationCenterDelegate>
+(AppDelegate *)sharedAppDelegate;


.m:
static AppDelegate *appDelegate = nil;
+(AppDelegate *)sharedAppDelegate{
    static dispatch_once_t pred;
    static AppDelegate *shared = nil;
    dispatch_once(&pred, ^{
        shared = [[super alloc] init];
    });
    return shared;
}

and then set delegate to that static property (sharedAppDelegate):

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    [[UIApplication sharedApplication] setDelegate:[AppDelegate sharedAppDelegate]];

i used this code on ios 11 and 12 and worked , But in ios 13 (xcode 11.3.1) when i set delegate app screen becomes black and xcode shows these errors:

Thread 1: signal SIGABRT


libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

What's the problem?

finally i want to open ios popup page to share a text to other apps like telegram or whatsapp or ... i need that delegate to use that on other classes that i call share functions:

void IOS::shareText(const QString &text) {

NSMutableArray *sharingItems = [NSMutableArray new];

    if (!text.isEmpty()) {
        [sharingItems addObject:text.toNSString()];
    }

    // get the main window rootViewController
    UIViewController *self = [[UIApplication sharedApplication].keyWindow rootViewController];

    UIActivityViewController *activityController = [[UIActivityViewController alloc] initWithActivityItems:sharingItems applicationActivities:nil];
    if ( [activityController respondsToSelector:@selector(popoverPresentationController)] ) { // iOS8
          activityController.popoverPresentationController.sourceView = self.view;
    }
    [self presentViewController:activityController animated:YES completion:nil];

}

i`m using mixed objective-c with c++ in qt

Answer 1

I'm don't know objective-c very well and i am trying to define an app delegate to use it in other classes.

after searching and according to some examples i found that i have to create an static property to save delegate in that:

.h:
@interface AppDelegate : UIResponder <UIApplicationDelegate, UNUserNotificationCenterDelegate>
+(AppDelegate *)sharedAppDelegate;


.m:
static AppDelegate *appDelegate = nil;
+(AppDelegate *)sharedAppDelegate{
    static dispatch_once_t pred;
    static AppDelegate *shared = nil;
    dispatch_once(&pred, ^{
        shared = [[super alloc] init];
    });
    return shared;
}

and then set delegate to that static property (sharedAppDelegate):

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    [[UIApplication sharedApplication] setDelegate:[AppDelegate sharedAppDelegate]];

i used this code on ios 11 and 12 and worked , But in ios 13 (xcode 11.3.1) when i set delegate app screen becomes black and xcode shows these errors:

Thread 1: signal SIGABRT


libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

What's the problem?

finally i want to open ios popup page to share a text to other apps like telegram or whatsapp or ... i need that delegate to use that on other classes that i call share functions:

void IOS::shareText(const QString &text) {

NSMutableArray *sharingItems = [NSMutableArray new];

    if (!text.isEmpty()) {
        [sharingItems addObject:text.toNSString()];
    }

    // get the main window rootViewController
    UIViewController *self = [[UIApplication sharedApplication].keyWindow rootViewController];

    UIActivityViewController *activityController = [[UIActivityViewController alloc] initWithActivityItems:sharingItems applicationActivities:nil];
    if ( [activityController respondsToSelector:@selector(popoverPresentationController)] ) { // iOS8
          activityController.popoverPresentationController.sourceView = self.view;
    }
    [self presentViewController:activityController animated:YES completion:nil];

}

i`m using mixed objective-c with c++ in qt