Why is Apple doing this in their example?

in apple's uicatalog example, there snippet wrote position toolbar @ bottom of screen in navigation controller view (in toolbarviewcontroller.m).

code:

  	// size toolbar , set frame  	[toolbar sizetofit];  	cgfloat toolbarheight = [toolbar frame].size.height;  	cgrect mainviewbounds = self.view.bounds;  	[toolbar setframe:cgrectmake(cgrectgetminx(mainviewbounds),  								 cgrectgetminy(mainviewbounds) + cgrectgetheight(mainviewbounds) - (toolbarheight * 2.0) + 2.0,  								 cgrectgetwidth(mainviewbounds),  								 toolbarheight)];  	  	[self.view addsubview:toolbar];  

what don't understand why shifting toolbar downwards 2px (the +2.0 part)? makes toolbar 2px shorter normal toolbar. intentional or there missing here?

guys!

 

well, more curious why subtracting toolbarheight twice.

have changed code , produces same result original (if uncomment "+2" part). , right.

code:

[toolbar sizetofit]; cgfloat toolbarheight = [toolbar frame].size.height; cgrect  mainviewbounds = self.view.bounds; cgrect  navrect = self.navigationcontroller.isnavigationbarhidden ? cgrectzero : self.navigationcontroller.navigationbar.bounds; cgrect  toolrect = cgrectmake(cgrectgetminx(mainviewbounds),                               cgrectgetminy(mainviewbounds) + cgrectgetheight(mainviewbounds) - (toolbarheight + navrect.size.height) /*+ 2.0*/,                               cgrectgetwidth(mainviewbounds),                               toolbarheight); [toolbar setframe:toolrect];

toolbar ends height of 44 @ y=372. parent view @ y=64, status bar plus navigation bar, 20 + 44. so, 372+64 = 436. toolbar start @ y=436 , height of 44 placed @ bottom. 436 + 44 = 480. but, placing 2 pixels below position, @ 438 482.

looks cooler if it's thinner.

in end, actualy strange not reducing main view height of navigation bar. think proper way code of decrease self.view.frame height of navigation bar.

 

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