CODEWITHSUNDEEP
iphoneobjective-cioscocoacgcontext
Dani
Dani

Reputation: 73

Draw Line in UIImageView by using CGPoints

I have an imageView and i want to draw lines on image in that imageView using CGPoints but i am getting errors like: invalid context etc.. any solution to draw lines without CGContext approach.

CGContextRef cntxt = UIGraphicsGetCurrentContext();
CGContextMoveToPoint(cntxt, p1.x, p1.y);
CGContextAddLineToPoint(cntxt, p2.x, p2.y);
CGContextStrokePath(cntxt);

Thanks

Upvotes: 2

Views: 402

Answers (1)

Rob Napier
Rob Napier

Reputation: 299345

You are likely attempting to draw outside of drawRect:. If you check the value of cntxt, it is likely NULL. A draw context is created prior to calling drawRect: and is destroyed afterwards. There is generally no "current context" outside of this function.

You need to keep track of your points in a data structure. In drawRect:, you will then do whatever drawing you need to do based on that data.

Upvotes: 1

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