ios - Objective C Resize image as 2x image -

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i resizing image after resizing image not returning in quality here code 

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

here code how call

uiimage *image = [self imagewithimage:self.selectedimage scaledtosize:cgsizemake((self.imageview.image.size.width*self.slider.value), (self.imageview.image.size.height*self.slider.value))];

result of image sma

here small image scaling.

you should use uigraphicsbeginimagecontextwithoptions instead of uigraphicsbeginimagecontext.

for example,

   uigraphicsbeginimagecontextwithoptions(signview.bounds.size, signview.opaque, 0.0);      [signview.layer renderincontext: uigraphicsgetcurrentcontext()];     // uiimage *imgmysignature = uigraphicsgetimagefromcurrentimagecontext();     signview.img = uigraphicsgetimagefromcurrentimagecontext();      uigraphicsendimagecontext();

i rendering image uiview i.e signview. can use this.


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