ios之runloop笔记

网上关于runloop的文章不计其数，再此，贴个自认为讲的比较简单明了的文章

http://www.jianshu.com/p/536184bfd163

个人理解：

ios的runloop应该是类似于线程之间的消息监听+队列（队列于外部不透明，支持多重send消息模式，perform selector，timer，UI事件等等）
和android的Looper非常相似，和windows的消息循环也很类似，具体底层实现不关注，直接贴测试代码

#import "ViewController.h"

@interface ViewController ()

@property(nonatomic, strong) NSThread *thread;
@property(nonatomic, strong) NSThread *msgThread;

@end

@implementation ViewController

- (void) viewDidLoad{
    [super viewDidLoad];
    
    [self initMsgThread];
}

- (void) initMsgThread{
    
    self.msgThread = [[NSThread alloc]initWithTarget:self selector:@selector(msgThreadInitFunc) object:nil];
    [self.msgThread start];
}

- (void) msgThreadInitFunc{
    NSLog(@"msgThreadInitFunc run, %@",[NSThread currentThread]);
    
    [[NSRunLoop currentRunLoop] addPort:[[NSPort alloc] init] forMode:NSDefaultRunLoopMode];
    [[NSRunLoop currentRunLoop] run];
    
    NSLog(@"msgThreadInitFunc run");
    
}

//******************************************************************************************************************
- (void) postMsgToThread{
    [[[NSThread alloc]initWithTarget:self selector:@selector(asyncPostMsgToThread) object:nil] start];
}

- (void) asyncPostMsgToThread{
    [self performSelector:@selector(onThreadMsgProc) onThread:self.msgThread withObject:nil waitUntilDone:NO];
}

- (void) onThreadMsgProc{
    NSLog(@"do some work %@, %s", [NSThread currentThread], __FUNCTION__);
}

//******************************************************************************************************************
- (void) startTimerOnThread{
    self.thread = [[NSThread alloc]initWithTarget:self selector:@selector(asyncStartTimerOnThread) object:nil];
    [self.thread start];
}

- (void) asyncStartTimerOnThread{
    [self performSelector:@selector(asyncStartTimer) onThread:self.thread withObject:nil waitUntilDone:NO];
    
//    [[NSRunLoop currentRunLoop] addPort:[[NSPort alloc] init] forMode:NSDefaultRunLoopMode];
    [[NSRunLoop currentRunLoop] run];
}

- (void) asyncStartTimer{
    [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(timerFired:)userInfo:nil repeats:YES];
}

- (void) timerFired:(id)timer{
    NSLog(@"on thread timer %s",__FUNCTION__);
}

//******************************************************************************************************************
- (IBAction)testButtonTapped:(id)sender {
//    [self postMsgToThread];
    [self startTimerOnThread];
}

@end

当然用block也是一样的，子线程必须创建runloop来监听消息，否则这个子线程是无法处理类似performSelector，NSTimer之类的消息的

线程之间通信，cocos2dx，u3d，ios，android，win32，都是基于消息队列的模式，一个发，一个收，写时加锁，别无更好的办法了