RN如何统计JS下载,加载,已经原生组件mapping所需要的时间的

RCTPerformanceLogger.h

  //开始
  RCTPerformanceLoggerStart(RCTPLNativeModuleInit);
  // 结束
  RCTPerformanceLoggerEnd(RCTPLNativeModuleInit);
  // 手动设置
  RCTPerformanceLoggerSet(RCTPLNativeModuleMainThreadUsesCount, modulesOnMainThreadCount);


typedef NS_ENUM(NSUInteger, RCTPLTag) {
  RCTPLScriptDownload = 0,
  RCTPLScriptExecution,
  RCTPLRAMBundleLoad,
  RCTPLRAMStartupCodeSize,
  RCTPLRAMNativeRequires,
  RCTPLRAMNativeRequiresCount,
  RCTPLRAMNativeRequiresSize,
  RCTPLNativeModuleInit,
  RCTPLNativeModuleMainThread,
  RCTPLNativeModulePrepareConfig,
  RCTPLNativeModuleInjectConfig,
  RCTPLNativeModuleMainThreadUsesCount,
  RCTPLJSCWrapperOpenLibrary,
  RCTPLJSCWrapperLoadFunctions,
  RCTPLJSCExecutorSetup,
  RCTPLBridgeStartup,
  RCTPLTTI,
  RCTPLBundleSize,
  RCTPLSize
};

RCTPerformanceLogger.m

static int64_t RCTPLData[RCTPLSize][2] = {};
static NSUInteger RCTPLCookies[RCTPLSize] = {};

void RCTPerformanceLoggerStart(RCTPLTag tag)
{
  if (RCTProfileIsProfiling()) {
    NSString *label = RCTPerformanceLoggerLabels()[tag];
    RCTPLCookies[tag] = RCTProfileBeginAsyncEvent(RCTProfileTagAlways, label, nil);
  }

  RCTPLData[tag][0] = CACurrentMediaTime() * 1000;
  RCTPLData[tag][1] = 0;
}

void RCTPerformanceLoggerEnd(RCTPLTag tag)
{
  if (RCTPLData[tag][0] != 0 && RCTPLData[tag][1] == 0) {
    RCTPLData[tag][1] = CACurrentMediaTime() * 1000;

    if (RCTProfileIsProfiling()) {
      NSString *label = RCTPerformanceLoggerLabels()[tag];
      RCTProfileEndAsyncEvent(RCTProfileTagAlways, @"native", RCTPLCookies[tag], label, @"RCTPerformanceLogger", nil);
    }
  } else {
    RCTLogInfo(@"Unbalanced calls start/end for tag %li", (unsigned long)tag);
  }
}