Question

我可以调用UIImageWriteToSavedPhotosAlbum并毫无问题地处理完成：

class A {
    func saveNow() {
        UIImageWriteToSavedPhotosAlbum(someImage, self, "saveImage:didFinishSavingWithError:contextInfo:", nil)
    }

    func saveImage(image: UIImage, didFinishSavingWithError error: NSError?, contextInfo:UnsafePointer<Void>) {
        // handle completion
    }
}

但是，如果我想让saveNow()成为静态函数，我无法设置completionTarget＆amp; completionSelector正确，以便我可以处理完成：

class B {
    static func saveNow() {
        UIImageWriteToSavedPhotosAlbum(someImage, /* how to set here */)
    }

    static func saveImage completionSelector(image: UIImage, didFinishSavingWithError error: NSError?, contextInfo:UnsafePointer<Void>) {
    }
}

如果我想使用静态函数，如何修改B类？

Answer 1

您需要做的是将目标设置为YourClassName.self。

即，

UIImageWriteToSavedPhotosAlbum(someImage, YourClassName.self, "saveImage:didFinishSavingWithError:contextInfo:", nil)

顺便说一下，你的函数名称不正确：

//Note the space between saveImage and completionSelector
static func saveImage completionSelector(image: UIImage, didFinishSavingWithError error: NSError?, contextInfo:UnsafePointer<Void>)

我认为应该是：

static func saveImageWithCompletionSelector(image: UIImage, didFinishSavingWithError error: NSError?, contextInfo:UnsafePointer<Void>)

因此，我们可能需要做出相应的改变：

UIImageWriteToSavedPhotosAlbum(someImage, YourClassName.self, "saveImageWithCompletionSelector:didFinishSavingWithError:contextInfo:", nil)

我刚刚对上述变化和建议进行了快速测试;应该有一个弹出窗口请求授权访问相册。

如何使用静态函数调用带完成处理程序的UIImageWriteToSavedPhotosAlbum（）？

1 个答案: