Question

I want to draw a simple shape in the iPhone simulator when a button is pressed. I can draw it on the screen using the QuartzView without generating an event for the button. However, I want to draw a shape with the touch of a button when an event is generated. I tried to write an IBAction method for the button in both QuartzView and UIViewController. However, I cannot generate an event. Can someone help?

Answer 1

write the following code inside the viewcontroller file. It will work:-

-(IBAction) getLine:(id) sender{
    CGPoint currentPoint;
    currentPoint.x=45;
    currentPoint.y=458;
    lastPoint.x=445;
    lastPoint.y=534;
    UIGraphicsBeginImageContext(self.drawImage.frame.size);
    [drawImage.image drawInRect:CGRectMake(0, 0, self.drawImage.frame.size.width, self.drawImage.frame.size.height)];
    CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);
    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0.0, 0.5, 0.6, 1.0);
    CGContextBeginPath(UIGraphicsGetCurrentContext());
    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
    CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
    CGContextStrokePath(UIGraphicsGetCurrentContext());
    drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

}

Feel free to ask anything more.