uiimage view and rectangle - iphone

Question

I want to draw a rectangle on one image
how to do that?

Answer 1

Start by reading Quartz 2D Programming Guide and go to paths section.

Answer 2

-(IBAction)Handeltap:(UIGestureRecognizer *)sender
{
if(sender.state==UIGestureRecognizerStateBegan)
{
tapPoint1 = [sender locationInView:sender.view];
NSLog(#"UIGestureRecognizerStateBegan and x=%d and y=%d",(int)tapPoint1.x,(int)tapPoint1.y);
img1=[[UIImageView alloc]initWithImage:nil];
[img1 setBackgroundColor:[UIColor lightTextColor]];
CGRect rect1=CGRectMake((float)tapPoint1.x,(float)tapPoint1.y,50,20);
NSLog(#"rect=%f and %f and %f and %f",rect1.origin.x,rect1.origin.y,rect1.size.width,rect1.size.height);
[img1 setFrame:rect1];
[self.view addSubview:img1];
[self.view bringSubviewToFront:img1];
}
if(sender.state==UIGestureRecognizerStateChanged)
{tapPoint2 = [sender locationInView:sender.view];
// NSLog(#"UIGestureRecognizerStateChanged and x=%d and y=%d",(int)tapPoint.x,(int)tapPoint.y);
[img1 setFrame:CGRectMake(img1.frame.origin.x,img1.frame.origin.y,(float)tapPoint2.x-img1.frame.origin.x,(float)tapPoint2.y-img1.frame.origin.y)];
}
if(sender.state==UIGestureRecognizerStateEnded)
{
tapPoint2 = [sender locationInView:sender.view];
NSLog(#"UIGestureRecognizerStateEnded and x=%d and y=%d",(int)tapPoint2.x,(int)tapPoint2.y);
[img1 setFrame:CGRectMake(img1.frame.origin.x,img1.frame.origin.y,(float)tapPoint2.x-img1.frame.origin.x,(float)tapPoint2.y-img1.frame.origin.y)];
}
}
add tap gesture and paste this
UILongPressGestureRecognizer *ges11=[[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(Handeltap:)];
[self.view addGestureRecognizer:ges11];
Tanks for helping me..

Answer 3

If you just want to add a simple colored rectangle to an image you can do it like this:
UIImage *imageFile = [[UIImage alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"myImageFile" ofType:#"jpg"]];
UIImageView *myImageFileView = [[UIImageView alloc] initWithImage:imageFile];
myImageFileView.frame = CGRectMake(0, 0, 320, 480); //size of image view
[self.view addsubview:myImageFileView]; //I assume this is within a view controller .m
UIView *rectangle = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)]; //A rectangle at point (0, 0) 50x50 in size.
rectangle.backgroundColor = [UIColor redColor]; //color the rectangle
[myImage addSubview:rectangle]; //add the rectangle to your image
[rectangle release];
[imageFile release];
[myImageFileView release];