ios - Example of NSTextContainer with non regular shape? -

hi i'm working new textkit api ios7 , i'm trying produce uitextview irregular shape. far have in view controller:

-(void) loadview {     self.view = [[uiview alloc] initwithframe:cgrectmake(0,0,320,548)];      nstextstorage *textstorage = [[nstextstorage alloc] init];      nslayoutmanager *layoutmanager = [[nslayoutmanager alloc] init];     [textstorage addlayoutmanager: layoutmanager];      basetextcontainer *textcontainer = [[basetextcontainer alloc] initwithsize:cgsizemake(100, 100)];     [layoutmanager addtextcontainer: textcontainer];      basetextview *textview = [[basetextview alloc] initwithframe:cgrectmake(110,124, 100, 100) textcontainer:textcontainer];     textview.backgroundcolor = [uicolor bluecolor];     textview.editable = yes;     [self.view addsubview:textview]; } 

then in subclassed nstextcontainer, want have mutablepath drawn shape of text container, not sure how accomplish this. have:

- (bool) issimplerectangulartextcontainer {     return no; }  - (void) drawlayer:(calayer *)layer incontext:(cgcontextref)ctx {     nslog(@"test");     cgcontextref context = ctx;     cgsize layersize = layer.frame.size;      cgaffinetransform transform = cgaffinetransformmakescale(layersize.width / self.initialsize.width, layersize.height / self.initialsize.height);     cgmutablepathref newgraphicmutablepath = cgpathcreatemutablecopybytransformingpath(self.mutablepath, &transform);     cgcontextaddpath(context, newgraphicmutablepath);      cgpathrelease(newgraphicmutablepath);     cgcontextsetfillcolorwithcolor(context, [uicolor redcolor].cgcolor);     cgcontextdrawpath(context, kcgpathfill); } 

just bit confused how work. cannot find example anywhere of nstextcontainer irregular shape.

there no need code constructing text kit stack, not modifying architecture of stack. start normal uitextview - let's it's self.textview - , assign 1 or more uibezierpath objects exclusion paths:

self.tv.textcontainer.exclusionpaths = myarrayofbezierpaths; 

these paths exclusion paths, ellipse want make 4 paths, each 1 describing corner of text container.

alternatively, can build text kit stack insert own text container subclass, , modify text allowed go overriding linefragmentforproposedrect:, perhaps similar here: https://github.com/mattneub/programming-ios-book-examples/blob/master/bk2ch10p537exclusionpath2/ch23p813textkitshapes/mytextcontainer.swift

some experiments: