objective c - Pick image and crop image became low quality iOS -

i can pick image gallery , crop image becomes low quality.

cgrect value=  avmakerectwithaspectratioinsiderect(imageview.image.size, imageview.frame); uigraphicsbeginimagecontext(imageview.image.size); [imageview.image drawinrect:cgrectmake(0,0, value.size.width, value.size.height)]; uiimage *img= uigraphicsgetimagefromcurrentimagecontext(); uigraphicsendimagecontext(); 

please 1 me figure out issue.

you need create context uigraphicsbeginimagecontextwithoptions, , pass in scale of 0. call uigraphicsbeginimagecontext not allow retina images.