ios - Adjusting image size on imagView and left bar button item -

in project have 'change logo' option. on clicking gray logo in front of change logo, gallery opens , user chooses photo it. done using following code:

-(void)imagepickercontroller:(uiimagepickercontroller *)picker didfinishpickingmediawithinfo:(nsdictionary *)info{     uiimage *image = info[uiimagepickercontrolleroriginalimage];     [imagepicker dismissviewcontrolleranimated:yes completion:nil];     imgtobesaved = image;     self.imgviewchooselogo.contentmode = uiviewcontentmodescaleaspectfit;     self.imgviewchooselogo.image = image;     imagechanged = yes;  } 

now image saved in documents directory. image should serve logo view controllers. have set left bar button item using following code:

nsdata *imagedata = [nsdata datawithcontentsoffile:[appdelegate documentdirectorywithfilepath]]; uiimage *image = [uiimage imagewithdata:imagedata]; uiimage *new =  [appdelegate  imagewithimage:image scaledtosize:cgsizemake(150, 40)]; uiimage *new1 = [new imagewithrenderingmode:uiimagerenderingmodealwaysoriginal]; uibarbuttonitem *barbuttonitem = [[uibarbuttonitem alloc] initwithimage:new1 style:uibarbuttonitemstyleplain target:nil action:nil]; [self.navigationitem setleftbarbuttonitem:barbuttonitem]; 

where method scaledtosize goes as

    +(uiimage*)imagewithimage:(uiimage*)image scaledtosize:(cgsize)newsize; {     uigraphicsbeginimagecontext( newsize );     [image drawinrect:cgrectmake(0,0,newsize.width,newsize.height)];     uiimage* newimage = uigraphicsgetimagefromcurrentimagecontext();     uigraphicsendimagecontext();     return newimage; } 

i have used 150*40 default logo fits perfectly. problem comes when have use other image choosen gallery. stretches on bar button item. don't know how set ratio of height , width of choosen gallery image image does'nt weired on left bar button item.

you should let user crop image before use it. have @ these frameworks (if don't want implement yourself:

https://github.com/yackle/climageeditor

https://github.com/itouch2/phototweaks