获取实例方法时Swizzling UIImage.init(named:) returns nil

Question

我正在尝试调配 UIImage 初始化函数，但在尝试获取实例函数时，它们 return 为零。任何的想法？

let instance = class_getInstanceMethod(self, #selector(UIImage.init(named))
let instanceWithBundle = class_getInstanceMethod(self, #selector(UIImage.init(named:in:with)

Answer 1

它 returns 没有因为在 Objective-C 它们实际上是 class 方法：

+[UIImage imageNamed:]

+[UIImage imageNamed:inBundle:withConfiguration:]

改为使用 class_getClassMethod（并确保在方法选择器中的 named 和 with 之后添加冒号）：

let imageNamedMethod = class_getClassMethod(UIImage.self, #selector(UIImage.init(named:)))
let imageNamedInWithMethod = class_getClassMethod(UIImage.self, #selector(UIImage.init(named:in:with:)))

获取实例方法时Swizzling UIImage.init(named:) returns nil

Swizzling UIImage.init(named:) returns nil when getting the instance method

ios

objective-c

swift

method-swizzling