iOS monitor app resumes from background to foreground

Under normal circumstances, the following two methods are implemented in the Appdelegate to enable monitoring to resume from the background to the foreground

[CPP]
-(void) Applicationdidenterbackground: (uiapplication *) application
{
Log4info (@ "---applicationdidenterbackground----");
Go backstage
}

-(void) Applicationdidbecomeactive: (uiapplication *) application
{

NSLog (@ "---applicationdidbecomeactive----");
Access to Reception


}

-(void) Applicationdidenterbackground: (uiapplication *) application
{
Log4info (@ "---applicationdidenterbackground----");
Go backstage
}

-(void) Applicationdidbecomeactive: (uiapplication *) application
{

NSLog (@ "---applicationdidbecomeactive----");
Access to Reception

}

But how does a single Uiviewcontroller listen?

In the-viewdidload method, add the Code listener notification

[CPP]
[[Nsnotificationcenter Defaultcenter] Addobserver:self
Selector: @selector (somemethod:)
Name:uiapplicationdidbecomeactivenotification Object:nil];

[[Nsnotificationcenter Defaultcenter] Addobserver:self
Selector: @selector (somemethod:)
Name:uiapplicationdidbecomeactivenotification Object:nil];
Don't forget to remove the listener from the-dealloc:

[CPP]
[[Nsnotificationcenter Defaultcenter] removeobserver:self];

[[Nsnotificationcenter Defaultcenter] removeobserver:self];

iOS monitor app resumes from background to foreground