在Swift中调用CGPatternCreate [英] Call CGPatternCreate in Swift

问题描述

我想知道如何将以下Objective-C方法转换为Swift函数？

I'm wondering how to convert the following objective-c method to Swift function?

CGPatternRef pattern = CGPatternCreate(NULL,
                                       rect,
                                       CGAffineTransformIdentity,
                                       24,
                                       24,
                                       kCGPatternTilingConstantSpacing,
                                       true,
                                       &callbacks);

我的代码：

    let callbacks : CGPatternCallbacks = CGPatternCallbacks(version: 0)

    let pattern : CGPatternRef = CGPatternCreate(nil,
        rect,
        CGAffineTransformIdentity,
        24,
        24,
        kCGPatternTilingConstantSpacing,
        true,
        callbacks)

但是我收到一条错误消息：

But I got an error message:

'CGPatternCallbacks'不能转换为'CConstPointer'

'CGPatternCallbacks' is not convertible to 'CConstPointer'

是否有示例代码？谢谢

推荐答案

类似的东西

var callbacks : CGPatternCallbacks = CGPatternCallbacks(version: 0)

var pattern = CGPatternCreate(nil,
    rect,
    CGAffineTransformIdentity,
    24,
    24,
    kCGPatternTilingConstantSpacing,
    true,
    &callbacks)

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