表达式解析为未使用的函数：CGContext.saveGState

Question

I am writing the code to draw image pattern but for the function CGContext.saveGState(), I am receiving error as Expression resolves to an unused function.

can anybody help to write same in swift 3.0. below is the code snippet:

UIGraphicsBeginImageContext(view.frame.size)
tempImageView.image?.draw(in: CGRect(x: 0, y: 0, width: view.frame.size.width, height: view.frame.size.height))
let context = UIGraphicsGetCurrentContext()
CGContext.saveGState(context!)

Thanks in advance

Answer 1

Just call saveGState directly on context object like this:

context?.saveGState()

Instead of:

CGContext.saveGState(context!)

Answer 2

Try this code:

UIGraphicsBeginImageContext(view.frame.size)
tempImageView.image?.draw(in: CGRect(x: 0, y: 0, width: view.frame.size.width, height: view.frame.size.height))
let context = UIGraphicsGetCurrentContext()
context?.saveGState()