I solved the problem.
it was my mistake in writing TextField.
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it says, "This post contains sensitive language. please revise it in order to continue."
I tried:
I removed Assets.xcassets file from project and Warning disappeared. ( I have no idea why)
First, I'm sorry for not expressing my question clearly.
I'd like to ask if I can implement property observer on "oppositePos" computed property to monitor change of opposite point according to change of original coordinatePoint.
However, on my second thought, I realized I couldn't implement it on the property and I didn't need to do it.
anyway, I got my answer for the question thanks to your advice.
again, thanks for your advice .
c00012
I solved this question myself.
I should completely implement protocol function in the class not to cause such an error like this:
class A: feature {
func getPayment(o: Offer) {
<#code#>
}
func Amortize(o: Offer) {
<#code#>
}
func Export() {
<#code#>
}
}