iphone - Size of Image on UINavigationBar -

i want put custom image on uinavigationbar,

when tried 2 code snippets,

[self.navigationitem settitleview:[[uiimageview alloc] initwithimage:[uiimage imagenamed:@"logo.png"]]]; 

and

    uibutton *logoview = [[uibutton alloc] initwithframe:cgrectmake(0,0,70,30)];     [logoview setbackgroundimage:[uiimage imagenamed:@"logo.png"] forstate:uicontrolstatenormal];     [logoview setuserinteractionenabled:no];     self.navigationitem.titleview = logoview; 

image can see on device getting blur or getting streched.

i made image resolution of 180*40(width*height)

i want know exact size of image. what, ?

thanks in advance.

use

uiimageview *navigationimage=[[uiimageview alloc]initwithframe:cgrectmake(0, 0, 98, 34)]; navigationimage.image=[uiimage imagenamed:@"topnav-logo.png"];  uiimageview *workaroundimageview = [[uiimageview alloc] initwithframe:cgrectmake(0, 0, 98, 34)];     [workaroundimageview addsubview:navigationimage];     self.navigationitem.titleview=workaroundimageview; 

hope helps.