Swift 4.1 – 子类UIImage

概述我在升级到 Swift 4.1后使用自定义init创建子类UIImage时,不支持覆盖扩展的非@ objc声明错误 class Foo: UIImage { init(bar: String) { } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been i 我在升级到 Swift 4.1后使用自定义init创建子类UIImage时,不支持覆盖扩展的非@ objc声明错误

class Foo: UIImage {    init(bar: String) { }    required init?(coder aDecoder: NSCoder) {        fatalError("init(coder:) has not been implemented")    }    // OverrIDing non-@objc declarations from extensions is not supported    required convenIEnce init(imageliteralResourcename name: String) {        fatalError("init(imageliteralResourcename:) has not been implemented")    }}

谢谢你的帮助

解决方法

extension UIImage {    /// Creates an instance initialized with the given resource name.    ///    /// Do not call this initializer directly. Instead,initialize a variable or    /// constant using an image literal.    required public convenIEnce init(imageliteralResourcename name: String)}

此init方法在UIiamge类的扩展上进行了分解.

The error pretty much says that if a function is declared in the extension than it can’t be overrIDden in this way

class Foo: UIImage {}extension Foo {    convenIEnce init(bar :String) {        self.init()    }}var temp = Foo(bar: "Hello")

你可以尝试以这种方式实现欲望的结果.

总结

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