CGContextSetLineDash不可用

Question

CGContextSetLineDash(context, 0, [2, 2], 2)

With the above line of code I get the error:

CGContextSetLineDash is unavailable: Use setLineDash(self:phase:lengths:)

I've tried CGContext.setLineDash to no avail, any suggestions?

Answer 1

setLineDash不是静态/类方法，它是一个实例方法：

context.setLineDash(phase: 0, lengths: [2, 2])

Answer 2

In Swift 3, a CGContext is a pseudo-object with instance methods.

Thus, for example:

class V : UIView {
    override func draw(_ rect: CGRect) {
        let c = UIGraphicsGetCurrentContext()!
        c.setLineDash(phase: 0, lengths: [2,2])
        // ... 
    }
}