화면에 그리기, 화면 저장하기.

//화면 캡쳐해서 저장하기

CGRect screenRect = CGRectMake(0, 40, 480, 320);

UIGraphicsBeginImageContext(screenRect.size);

CGContextRef context = UIGraphicsGetCurrentContext();

[[UIColor clearColor] set];

CGContextClipToRect(context, screenRect);

[self.layer renderInContext:context];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

// UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil); // 사진앨범 저장

UIGraphicsEndImageContext();

//선그리기

-(id)init

{

if (self =[super init])

{

drawImgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];

drawImgView.backgroundColor = [UIColor darkGrayColor];

[self.view addSubview:drawImgView];

[drawImgView release];

}

return self;

}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

UITouch *touch = [touches anyObject];

startX = [touch locationInView:drawImgView].x;

startY = [touch locationInView:drawImgView].y;

}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event

{

UITouch *touch = [touches anyObject];

int moveX = [touch locationInView:drawImgView].x;

int moveY = [touch locationInView:drawImgView].y;

UIGraphicsBeginImageContext(drawImgView.frame.size);

[drawImgView.image drawInRect:CGRectMake(0, 0, drawImgView.frame.size.width, drawImgView.frame.size.height)];

CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);

CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);

CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 1.0);

CGContextMoveToPoint(UIGraphicsGetCurrentContext(), startX, startY);

CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), moveX, moveY);

CGContextStrokePath(UIGraphicsGetCurrentContext());

CGContextFlush(UIGraphicsGetCurrentContext());

drawImgView.image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

startX = moveX;

startY = moveY;

}