常驻线程

模仿曾经的AFN常驻线程写法，现在的YY的写法也是如此

+ (NSThread *)zyThread {
    static NSThread * _zyThread = nil;
    static dispatch_once_t oncePredicate;
    dispatch_once( &oncePredicate, ^{
        _zyThread = [[NSThread alloc]initWithTarget:self
                                           selector:@selector(zyThreadEntryPoint:)
                                             object:nil];
        [_zyThread start];
    });
    return _zyThread;
}

+ (void)zyThreadEntryPoint:(id) __unused objec {
    @autoreleasepool {
        [[NSThread currentThread] setName:@"ZY_Thread"];
        [[NSRunLoop currentRunLoop] addPort:[NSMachPort port] forMode:NSRunLoopCommonModes];
        [[NSRunLoop currentRunLoop] run];
    }
}

使用performSelector: onThread:简单调用如下

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    
    [self performSelector:@selector(sayHello:)
                 onThread:[ZYThread zyThread]
               withObject:@"hello~"
            waitUntilDone:NO];
    // waitUntilDone：等selector执行完 再往下执行
    // wait:NO , 先touches method 再 sayHello
    NSLog(@" touches method ~ ");
}

- (void)sayHello:(id)object
{
    
    NSLog(@"%@------ %@", object , [NSThread currentThread]);
}

Xcode中可见

• 

  image.png

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当然，现在的AFN不是上面那么用了，如下

1

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
       [inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
  ···

2

[[NSRunLoop mainRunLoop] addTimer:self.completionDelayTimer forMode:NSRunLoopCommonModes];