为什么“nil"与“UnsafePointer<CGAffineTransform>"不兼容在 Swift 3 中? [英] Why is 'nil' not compatible with 'UnsafePointer<CGAffineTransform>' in Swift 3?

问题描述

尝试创建一个 CGMutablePath() 如下:

Trying to create a CGMutablePath() as such:

let path = CGMutablePath()
CGPathMoveToPoint(path, nil, 30, 0)

但编译器不断给我以下错误:'nil' not compatible with expected argument type 'UnsafePointer<CGAffineTransform>'.我究竟做错了什么?我似乎无法在网上找到其他任何东西.(是的，我已经尝试将 Ints 转换为 CGFloats，但似乎没有什么区别.)

but the compiler keeps on giving me the following error: 'nil' not compatible with expected argument type 'UnsafePointer<CGAffineTransform>'. What am I doing wrong? I can't seem to find anything else online. (Yes I've tried converting the Ints to CGFloats but it doesn't seem to make a difference.)

推荐答案

试试这个:

let path = CGMutablePath()
path.move(to: CGPoint(x: 30, y: 0))

CGPath API 现在在 Swift 3 中作为实例方法导入.您可以通过按住 Command 键单击 CGMutablePath 来检查它们.或者查看CGMutablePath的最新参考.

CGPath APIs are now imported as instance methods in Swift 3. You can check them with Command-clicking on CGMutablePath. Or see the latest reference of CGMutablePath.

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