Some common little knowledge points of iOS

Gets the global delegate object so that we can invoke the methods and variables in this object

[[UIApplication Sharedapplication] delegate];

Get the main bundle of the program

NSBundle *bundle = [NSBundle mainbundle];

/*

Play a sound in the program

1. Add Audiotoolbox Frame

*/

NSString *path = [Bundle pathforresource:@ "Soundfilename" oftype:@ "wav"];

Systemsoundid Soundid;

Audioservicescreatesystemsoundid ((__bridge cfurlref) ([Nsurl Urlwithstring:path]), &soundid);

Audioservicesplayalertsound (Soundid);

Capture program shuts down or enters background events

UIApplication *application = [UIApplication sharedapplication];

[[Nsnotificationcenter Defaultcenter] addobserver:self selector: @selector (applicationwillresignactive:) Name: Uiapplicationwillresignactivenotification Object:application];

}

-(void) Applicationwillresignactive: (nsnotification *) noti{

}

#pragma mark-Get a screenshot

-(UIImage *) getscreenshot{

Uigraphicsbeginimagecontext (self.view.bounds.size);

[Self.view.layer Renderincontext:uigraphicsgetcurrentcontext ()];

UIImage *image = Uigraphicsgetimagefromcurrentimagecontext ();

Uigraphicsendimagecontext ();

return image;

}

Some common little knowledge points of iOS