ios - How to take snapshot of app running on simulator? -

i used code take snapshot of app running on simulator, quality of snap not good, idea?

-(ibaction)btnsave:(id)sender {     uigraphicsbeginimagecontextwithoptions(self.view.bounds.size,self.view.opaque,10.0f);     [self.view.layer renderincontext:uigraphicsgetcurrentcontext()];     uiimage * screenshot = uigraphicsgetimagefromcurrentimagecontext();     uigraphicsendimagecontext();     /* render screen shot @ custom resolution */     cgrect croprect = cgrectmake(0,0,320,500);      uigraphicsbeginimagecontextwithoptions(croprect.size,brochuresave.opaque,10.0f);     [screenshot drawinrect:croprect];     uiimage * customscreenshot = uigraphicsgetimagefromcurrentimagecontext();            uigraphicsendimagecontext();     /* save photo album */     // uiimagewritetosavedphotosalbum(customscreenshot , nil, nil, nil);      [self.library saveimage:customscreenshot toalbum:@"cemara roll" withcompletionblock:^(nserror *error) {         if (error!=nil)         {             nslog(@"big error: %@",[error description]);         }         else         {             uialertview *alert=[[uialertview alloc] initwithtitle:@"message" message:@"image save cemara roll" delegate:self cancelbuttontitle:@"ok" otherbuttontitles:nil, nil];             [alert show];         }     }]; } 

try changing 10.0f 0.0f in uigraphicsbeginimagecontextwithoptions:

here:

uigraphicsbeginimagecontextwithoptions(self.view.bounds.size,self.view.opaque,0.0f);