说说XcodeLLDB调试的那些事儿

 brew update
 brew install chisel 

Options:
--color/-c <color>; Type: string; A color name such as 'red', 'green',
 'magenta', etc.
 --width/-w <width>; Type: CGFloat; Desired width of border.
Syntax: border [--color=color] [--kw" ><viewOrLayer>

border -c blue -w 2 0x7feae2d605f0  //添加边框
unborder 0x7feae2d605f0   //移除边框

(lldb) pinternals 0x7fa59c2446f0
(WKCompositingView) $451 = {
  UIView = {
    UIResponder = {
      NSObject = {
        isa = WKCompositingView
      }
      _hasAlternateNextResponder = false
      _hasInputAssistantItem = false
    }
    _constraintsExceptingSubviewAutoresizingConstraints = 0x00007fa59c248910 @"0 elements"
    _cachedTraitCollection = nil
    _layer = 0x00007fa599d81ba0
    _layerRetained = nil
    _gestureInfo = nil
    _gestureRecognizers = nil
    _subviewCache = 0x00007fa599f027d0 @"0 elements"
    _templateLayoutView = nil
    _charge = 0
    _tag = 0
    _viewDelegate = nil
    _backgroundColorSystemColorName = nil
    _countOfMotionEffectsInSubtree = 0
    _countOfTraitChangeRespondersInDirectSubtree = 0
    _cachedScreenScale = 2
    _retainCount = 4
    _tintAdjustmentDimmingCount = 0
    _shouldArchiveUIAppearanceTags = false
    _interactionTintColor = nil
    _layoutMarginsGuide = nil
    _minXVariable = 0x00007fa59c223790
    _minYVariable = 0x00007fa59c2237b0
    _boundsWidthVariable = 0x00007fa59c223ae0
    _boundsHeightVariable = 0x00007fa59c223800
    _layoutEngine = 0x00007fa59c014820
    _layoutDebuggingIdentifier = nil
    _internalConstraints = nil
    _continuousCornerRadius = 0
    _countOfFocusedAncestorTrackingViewsInSubtree = 0
    _semanticContentAttribute = 0
    __presentationControllerToNotifyOnLayoutSubviews = nil
    _previewingSegueTemplateStorage = nil
    _contentSizeNotificationToken = nil
    _readableContentGuide = 0x00007fee7c508a00
  }
}

(lldb) eobjc id $controller=(id)0x7fe8ab72ab50 //设置controller变量指向当前ViewController
(lldb) bmessage [$controller viewDidAppear:] //给当前ViewController设置断点
Setting a breakpoint at -[UIViewController viewDidAppear:] with condition (void*)(id)$rdi == 0x00007fe8ab72ab50
Breakpoint 1: where = UIKit`-[UIViewController viewDidAppear:], address = 0x000000010e646d12