How IOS cuts round avatar _ios

The example of this article introduces the detailed code of the iOS cropped round head, for everyone's reference, the specific contents are as follows

-(void) viewdidload {
  [super viewdidload];
   
  Load Picture
  uiimage *image = [UIImage imagenamed:@ "brother Philip"];
   
  Get picture size
  cgsize size = image.size;
   
  Open Bitmap Context
  uigraphicsbeginimagecontextwithoptions (size, NO, 0);
   
  Create a circular path
  uibezierpath *path = [Uibezierpath bezierpathwithovalinrect:cgrectmake (0, 0, Image.size.width, Image.size.height)];
   
  Set to Crop area
  [path Addclip];
   
  Draw picture
  [Image Drawatpoint:cgpointzero];
   
  Gets the cropped picture
  _imageview.image = Uigraphicsgetimagefromcurrentimagecontext ();
   
  Close context
  uigraphicsendimagecontext ();
   
}

One more picture of Brother Phillips.

If you want to have a round head with a border, the idea is to draw a big circle, and then in this circle size range to draw a picture of the size of a circle.

-(void) viewdidload {
  [super viewdidload];
   
  Load Picture
  uiimage *image = [UIImage imagenamed:@ "Big Brother"];
   
  Set border width
  cgfloat border = 3;
  CGFloat imagewh = image.size.width;
   
  Calculate the dimensions of the outer circle
  cgfloat ovalwh = imagewh + 2 * border;
   
  Open context
  uigraphicsbeginimagecontextwithoptions (image.size, NO, 0);
   
  Draw a large circular
  uibezierpath *path = [Uibezierpath bezierpathwithovalinrect:cgrectmake (0, 0, OVALWH, OVALWH)];
   
  [[Uicolor Orangecolor]set];
   
  [path fill];
   
  Set Crop area
  uibezierpath *path1 = [Uibezierpath bezierpathwithovalinrect:cgrectmake (Border, border, IMAGEWH, IMAGEWH)];
  [path1 Addclip];
   
  Draw pictures
  [image drawatpoint:cgpointmake (Border, border)];
   
  Gets the picture from the context
  _imageview.image = Uigraphicsgetimagefromcurrentimagecontext ();
   
  Close context
  uigraphicsendimagecontext ();
   
}

Effect as shown:

Screen capture code:
The principle is to render the layer of the controls on the screen into context

-(void) viewdidload {
  [super viewdidload];
   
  Open context
  uigraphicsbeginimagecontextwithoptions (self.view.bounds.size, NO, 0);
   
  Gets the context
  cgcontextref CTX = Uigraphicsgetcurrentcontext ();
   
  Renders the layer on the control to the context
  [Self.view.layer renderincontext:ctx];
   
  Gets the picture in the context
  uiimage *image = Uigraphicsgetimagefromcurrentimagecontext ();
   
  Closes the context
  uigraphicsendimagecontext ();
   
  Save picture to album
  Uiimagewritetosavedphotosalbum (image, nil, nil, nil);
   
}

The above is the entire content of this article, I hope to help you learn.