学步园

下面的这些函数是定义在NSObject中的，关于它们的具体含义，你可以在官方文档中找，或者google之，这里就不啰嗦了。

Sending Messages

• – performSelector:withObject:afterDelay:
• – performSelector:withObject:afterDelay:inModes:
• – performSelectorOnMainThread:withObject:waitUntilDone:
• – performSelectorOnMainThread:withObject:waitUntilDone:modes:
• – performSelector:onThread:withObject:waitUntilDone:
• – performSelector:onThread:withObject:waitUntilDone:modes:
• – performSelectorInBackground:withObject:
• + cancelPreviousPerformRequestsWithTarget:
• + cancelPreviousPerformRequestsWithTarget:selector:object:

下面给出一个例子：

- (IBAction)Start:(id)sender {
    [self performSelector:@selector(doSomething:)];
    //[self doSomething:nil];
    //[self per
    [self performSelectorInBackground:@selector(doSomething:) withObject:nil];
    
}

-(void)doSomething:(id)inputData
{
    if([NSThread isMainThread])
    {
        NSLog(@"in main thread");
        
    }
    else {
        NSLog(@"not in main thread");
    }
    NSLog(@"kkkkk");
}