如何在Cocoa中打印控件层次结构？

Carbon有一个名为DebugPrintControlHierarchy的有用函数

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NSView或NSWindow是否有类似的功能？

我不知道究竟打印了什么

DebugPrintControlHierarchy

，但NSView有一个有用的方法调用

\u subtreeDescription

，它返回一个字符串，描述接收器下的整个层次结构，包括类、帧和其他有用的信息

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不要害怕前面的下划线。它不是公共API，但在gdb中被批准用于公共用途。您可以看到它与一些示例输出一起被提到。

以下是我不久前构建的NSView类别的精髓：

+ (NSString *)hierarchicalDescriptionOfView:(NSView *)view 
                                      level:(NSUInteger)level
{

  // Ready the description string for this level
  NSMutableString * builtHierarchicalString = [NSMutableString string];

  // Build the tab string for the current level's indentation
  NSMutableString * tabString = [NSMutableString string];
  for (NSUInteger i = 0; i <= level; i++)
    [tabString appendString:@"\t"];

  // Get the view's title string if it has one
  NSString * titleString = ([view respondsToSelector:@selector(title)]) ? [NSString stringWithFormat:@"%@", [NSString stringWithFormat:@"\"%@\" ", [(NSButton *)view title]]] : @"";

  // Append our own description at this level
  [builtHierarchicalString appendFormat:@"\n%@<%@: %p> %@(%li subviews)", tabString, [view className], view, titleString, [[view subviews] count]];  

  // Recurse for each subview ...
  for (NSView * subview in [view subviews])
    [builtHierarchicalString appendString:[NSView hierarchicalDescriptionOfView:subview 
                                                                          level:(level + 1)]];

  return builtHierarchicalString;
}

- (void)logHierarchy
{
  NSLog(@"%@", [NSView hierarchicalDescriptionOfView:self
                                               level:0]);
}

+（NSString*）层次结构描述视图：（NSView*）视图
级别：（整数）级别
{
//准备好此级别的描述字符串
NSMutableString*builtHierarchicalString=[NSMutableString]；
//为当前级别的缩进生成选项卡字符串
NSMutableString*tabString=[NSMutableString]；
对于（i=0；i4

macOS：

extension NSView {

   // Prints results of internal Apple API method `_subtreeDescription` to console.
   public func dump() {
      Swift.print(perform(Selector(("_subtreeDescription"))))
   }
}

extension UIView {

   // Prints results of internal Apple API method `recursiveDescription` to console.
   public func dump() {
      Swift.print(perform(Selector(("recursiveDescription"))))
   }
}

iOS：

extension NSView {

   // Prints results of internal Apple API method `_subtreeDescription` to console.
   public func dump() {
      Swift.print(perform(Selector(("_subtreeDescription"))))
   }
}

extension UIView {

   // Prints results of internal Apple API method `recursiveDescription` to console.
   public func dump() {
      Swift.print(perform(Selector(("recursiveDescription"))))
   }
}

用法（在调试器中）：
po myView.dump（）