iOS round picture clipping, prototype picture add a circle outside

/**

* Add a ring outside the circle

*/

-(void) yuanhuan{

//0. Loading pictures

UIImage *image = [UIImage imagenamed:@ "AppIcon1024"];

//width of picture

CGFloat IMAGEWH = image.size.width;

//Set the width of the ring

CGFloat border = 1;

//Large round width height

CGFloat OVALWH = imagewh + 2 * border;

///1, open bitmap context

Uigraphicsbeginimagecontextwithoptions (Cgsizemake (OVALWH, OVALWH), NO, 0);

//2, Draw a great circle

Uibezierpath *path = [Uibezierpath bezierpathwithovalinrect:cgrectmake (0, 0, OVALWH, OVALWH)];

[[Uicolor Redcolor] set];

[Path fill];

//3, set the cropping area (small circle)

Uibezierpath *clippath = [Uibezierpath bezierpathwithovalinrect:cgrectmake (Border, border, IMAGEWH, ImageWH)];

[Clippath Addclip];

///4, drawing pictures

[Image drawatpoint:cgpointmake (Border, border)];

//5, Get pictures

UIImage *clipimage = Uigraphicsgetimagefromcurrentimagecontext ();

//6, closing context

Uigraphicsendimagecontext ();

Self.imageView.image = Clipimage;

}

/**

* Crop a prototype image

*/

-(void) yuan{

//Get Pictures

UIImage *image = [UIImage imagenamed:@ "AppIcon1024"];

//1. Turn on the bitmap context, just like the size of the picture

No: opaque 0:scale not scaled

Uigraphicsbeginimagecontextwithoptions (Image.size, NO, 0);

//2. Setting the cropping area of a graphic, tangent picture

2.1 Creating a circular path

Uibezierpath *path = [Uibezierpath bezierpathwithovalinrect:cgrectmake (0, 0, Image.size.width, Image.size.width)];

//2.2 Set the path to the clipping area

[Path Addclip];

//3. Drawing pictures

[Image Drawatpoint:cgpointmake (0, 0)];

//4. Getting a picture from the context

UIImage *clipimage = Uigraphicsgetimagefromcurrentimagecontext ();

//5. Closing the context

Uigraphicsendimagecontext ();

_imageview.image = Clipimage;

}

iOS round picture clipping, prototype picture add a circle outside