Null传递给需要非null参数的被调用方

问题描述

我一直在使用它来将CIImage转换为NSData很久了:

I have been using this to convert a CIImage to NSData for ages:

  NSData *data = [imageRep representationUsingType: NSPNGFileType
                            properties:nil];

现在在Capitan上，第二行出现此错误:

Now on El Capitan I have this error on the second line:

Null passed to a callee that requires a non-null argument

我可以通过在属性上使用空数组来解决此问题，如下所示:

I can solve that by using an empty array on the properties, like this:

NSData *data = [imageRep representationUsingType: NSPNGFileType
                                      properties: @{}];

但是我怀疑这将来会给我带来麻烦.

but I am suspecting that this can cause me problems in the future.

这是解决此问题的正确方法吗?

Is this the correct way to solve this problem?

推荐答案

是的

在API中似乎有一些地方接受了nil值，而不是一个空集合，即使它没有被证明是有效的. Apple为更好地支持与Swift的互操作而添加的non-nil注释只是突出显示了这些.

There appear to be a few places in the API which accepted nil values rather than an empty collection even though it was not documented as valid. The non-nil annotations added by Apple to better support inter-working with Swift are just highlighting these.

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