ios - CGContextRotateCTM not working for rotating a UIImage -


i want draw delete button delete app button on home screen below code.

the idea draw cross first, , rotate 45 degree. what's wrong code?

self.deletebutton = [[uibutton alloc] initwithframe:cgrectmake(0, 0, badge_size, badge_size)];  if (!deletebtnimg) {     cgrect imgframe = self.deletebutton.bounds;      uigraphicsbeginimagecontextwithoptions(imgframe.size, no, 0.0);      cgcontextref context = uigraphicsgetcurrentcontext();     cgcontextsavegstate(context);      cgfloat size = min(imgframe.size.width, imgframe.size.height);     uibezierpath *path = [uibezierpath bezierpathwitharccenter:cgpointmake(imgframe.size.width/2, imgframe.size.height/2)                                                         radius:size/2-radius_margin                                                     startangle:0                                                       endangle:m_pi * 2                                                      clockwise:yes];     [path movetopoint:cgpointmake(size / 2, 0)];     [path addlinetopoint:cgpointmake(size / 2, size)];     [path movetopoint:cgpointmake(0, size / 2)];     [path addlinetopoint:cgpointmake(size, size / 2)];     [[uicolor whitecolor] setfill];     [[uicolor redcolor] setstroke];     [path setlinewidth:1.0];     [path fill];     [path stroke];      cgcontextrotatectm(context, m_pi/4);      deletebtnimg = uigraphicsgetimagefromcurrentimagecontext();     cgcontextrestoregstate(context);     uigraphicsendimagecontext(); } [self.deletebutton setimage:deletebtnimg forstate:uicontrolstatenormal];

you have rotate context before start drawing. if rotate before drawing. image still not right. because when rotate context, context rotating around it's origin point (0,0) or bottom-left corner (the coregraphic's coordinate system bit different ui's). is, before rotation, translate context rotate around center, , move after rotation. here quick example: 

cgcontextref context = uigraphicsgetcurrentcontext(); cgcontextsavegstate(context); cgfloat size = min(imgframe.size.width, imgframe.size.height); cgcontexttranslatectm(context, size / 2, size / 2); cgcontextrotatectm(context, m_pi_4); cgcontexttranslatectm(context, -size / 2, -size / 2);  // start drawing code

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