osx - OS X / cocoa - How get event on lock screen session -

#import "appdelegate.h"  @interface appdelegate () @property (weak) iboutlet nswindow *jj;  @end  @implementation appdelegate  @synthesize jj;  - (void)applicationdidfinishlaunching:(nsnotification *)anotification {     // insert code here initialize application     [nsevent addlocalmonitorforeventsmatchingmask:nseventmaskswipe | nseventmaskbegingesture |  nseventmaskgesture | nseventmaskendgesture handler:^(nsevent *event) {          nslog(@"local");          return event;     }];      [nsevent addglobalmonitorforeventsmatchingmask:nseventmaskswipe | nseventmaskbegingesture |     nseventmaskgesture | nseventmaskendgesture handler:^(nsevent *event) {          nslog(@"global");     }];      nsdistributednotificationcenter* center;     center = [nsdistributednotificationcenter defaultcenter];      [center addobserver:self selector:@selector(a) name:@"com.apple.screenislocked" object:nil];      nswindow* = [[nsapplication sharedapplication] windows].firstobject;      [a makekeyandorderfront:nil];     [a setlevel:kcgmaximumwindowlevel]; }  - (void)a {     nslog(@"sibar");      [[nsapplication sharedapplication] activateignoringotherapps:yes];      [nsevent addlocalmonitorforeventsmatchingmask:nseventmaskswipe | nseventmaskbegingesture |  nseventmaskgesture | nseventmaskendgesture handler:^(nsevent *event) {          nslog(@"local");          return event;     }]; }  - (void)applicationwillterminate:(nsnotification *)anotification {     // insert code here tear down application }  @end 

i want touch event when on lock screen

i want develop custom lock screen

so try show screen on lock screen , event

show screen slove [window makekeyandorderfront:nil];

but event not received

it because window , app can't focus

please me

// upload app on app store, need non-sandbox-violance solution