Swift 中的递归描述方法? [英] recursiveDescription method in Swift?

问题描述

有没有办法在 Swift 中使用 [self.view recursiveDescription]?我正在尝试使用此方法，但出现以下错误:

Is there a way to use [self.view recursiveDescription] in Swift? I am trying to use this method but I am getting the following error:

'UIView' does not have a member named 'recursiveDescription'

有什么建议吗?

推荐答案

为了访问私有/未记录的 Objective-C API(如 UIView 上的 -recursiveDescription 方法) 从 Swift 您可以执行以下操作:

In order to access private / undocumented Objective-C API (like the -recursiveDescription method on UIView) from Swift you can do the following:

1. 在定义私有方法的类上创建一个新的 Objective-C 类别(例如 UIView).
2. 如果 Xcode 询问您有关配置桥接头的问题，请点击 Yes.(如果您的项目中已有桥接头，则将跳过此步骤).
3. 可以删除类别的实现文件 (.m).

4. 在类别头中声明私有方法:

1. Create a new Objective-C category on the class the private method is defined in (e.g. UIView).
2. Hit Yes if Xcode asks you about configuring an bridging header. (If you have already an bridging header in your project this step will be skipped).
3. The implementation file (.m) of the category can be removed.

4. Declare the private method in the category header:

// UIView+Debugging.h

@interface UIView (Debugging)
- (id)recursiveDescription;
@end

现在可以设置断点并打印出LLDB中的递归描述:

Now you can set a breakpoint and print out the recursive description in LLDB:

po view.recursiveDescription() as NSString

这篇关于Swift 中的递归描述方法?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！