iOS picture clipping (code)

-(void) viewdidload

{

UIImage *oldimage = [UIImage imagenamed:@ "new"];

　　

UIImage *oldimage = [UIImage imagenamed:@ "new"];

CGFloat CenterX = OLDIMAGE.SIZE.WIDTH/2;

CGFloat centery = OLDIMAGE.SIZE.HEIGHT/2;

CGFloat radius = 30;

1. Creating a Graphics context

Uigraphicsbeginimagecontextwithoptions (Oldimage.size, NO, 0.0);

2. Get the graphics context

Cgcontextref ref =uigraphicsgetcurrentcontext ();

3. Draw a Circle

Cgcontextaddarc (ref, CenterX, CenterY, radius,0, M_PI, 0);

4. Cut the picture

Cgcontextclip (ref);

5. Get the current picture

UIImage *newimage = Uigraphicsgetimagefromcurretimagecontext ();

6. Ending the graphics context

Uigraphicsendimagecontext ();

7. Get Data

NSData *data = uiimagepngrepresentation (NEWIMGE);

[Data writetofile:@ "/users/apple/desktop/new1.png" atomically:yes];

　　

}

iOS picture clipping (code)