RCBridge 初始化時聲明了一個 CADisplayLink

_jsDisplayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(_jsThreadUpdate:)];

在 _jsThreadUpdate 函數中，處理界面更新。這個 CADisplayLink 隨后被加到 JS 線程對應的 RunLoop 中。

- (void)addToRunLoop:(NSRunLoop *)runLoop {_runLoop = runLoop;[_jsDisplayLink addToRunLoop:runLoop forMode:NSRunLoopCommonModes]; }

RCTCxxBridge 聲明了一個 thread

_jsThread = [[NSThread alloc] initWithTarget:selfselector:@selector(runJSRunLoop)object:nil];_jsThread.name = RCTJSThreadName;_jsThread.qualityOfService = NSOperationQualityOfServiceUserInteractive;[_jsThread start];

并為這個 thread 聲明了要給 RunLoop

// copy thread name to pthread name pthread_setname_np([NSThread currentThread].name.UTF8String);// Set up a dummy runloop source to avoid spinning CFRunLoopSourceContext noSpinCtx = {0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL}; CFRunLoopSourceRef noSpinSource = CFRunLoopSourceCreate(NULL, 0, &noSpinCtx); CFRunLoopAddSource(CFRunLoopGetCurrent(), noSpinSource, kCFRunLoopDefaultMode); CFRelease(noSpinSource);RCT_PROFILE_END_EVENT(RCTProfileTagAlways, @"");// run the run loop while (kCFRunLoopRunStopped != CFRunLoopRunInMode(kCFRunLoopDefaultMode, ((NSDate *)[NSDate distantFuture]).timeIntervalSinceReferenceDate, NO)) {RCTAssert(NO, @"not reached assertion"); // runloop spun. that's bad. }

RunLoop 的調用方式之 performSelector



如下，原因是因為有如下調用：

if ([NSThread currentThread] == _jsThread) {[self _tryAndHandleError:block];} else {[self performSelector:@selector(_tryAndHandleError:)onThread:_jsThreadwithObject:blockwaitUntilDone:NO];}

在 RunLoop 上執行一函數

CFRunLoopPerformBlock(m_cfRunLoop, kCFRunLoopCommonModes, ^{ func(); });

Enqueues a block object on a given runloop to be executed as the runloop cycles in specified modes.

把 CADisplayLink 加到指定的 RunLoop 中，然后相應



_jsDisplayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(_jsThreadUpdate:)]; [_jsDisplayLink addToRunLoop:runLoop forMode:NSRunLoopCommonModes];

轉載于:https://www.cnblogs.com/huahuahu/p/RN-47-zhong-de-JS-xian-cheng-ji-RunLoop.html

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