ios - invalid context 0x0, Creating UIImage from CALayer -


i trying convert calayer uiimage code post. copied here. when use got tons of error. @ first put in nsobject class use store model. read in post suppose put in controller, view or category of calayer. tried putting in controller or calayer , still doesn't work.

- (uiimage *)imagefromlayer:(calayer *)layer {      if ([[uiscreen mainscreen] respondstoselector:@selector(scale)])         uigraphicsbeginimagecontextwithoptions([layer frame].size, no, [uiscreen mainscreen].scale);     else         uigraphicsbeginimagecontext([layer frame].size);      [layer renderincontext:uigraphicsgetcurrentcontext()];     uiimage *outputimage = uigraphicsgetimagefromcurrentimagecontext();      uigraphicsendimagecontext();      return outputimage; }

error:

<error>: cgcontextsetstrokecolorwithcolor: invalid context 0x0 <error>: cgcontextsetlinewidth: invalid context 0x0 <error>: cgcontextmovetopoint: invalid context 0x0 <error>: cgcontextaddarc: invalid context 0x0 <error>: cgcontextaddarc: invalid context 0x0 <error>: cgcontextaddarc: invalid context 0x0 <error>: cgcontextaddarc: invalid context 0x0 <error>: cgcontextclosepath: invalid context 0x0 <error>: cgcontextdrawpath: invalid context 0x0 <error>: cgcontextrestoregstate: invalid context 0x0 <error>: cgcontextrestoregstate: invalid context 0x0 <error>: cgcontextsetbasectm: invalid context 0x0 <error>: cgcontextrestoregstate: invalid context 0x0 <error>: cgcontextendtransparencylayer: invalid context 0x0 <error>: cgcontextrestoregstate: invalid context 0x0 <error>: cgcontextsavegstate: invalid context 0x0 <error>: cgcontextsetalpha: invalid context 0x0

check if layer parameter nil. context cannot created if size has either width = 0 or height = 0 (or both).


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