使用NSObject中的函数起线程

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");
}