NSRunLoop的使用场景

1.应用一：定时器与滚动事件

[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];

2.应用二:异步请求与滚动事件

NSURLConnection *connection = [NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO];

[connection scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];

[connection start];

3.应用三：子线程中添加异步请求

在子线程中添加：

while (1) {

[NSRunLoop currentRunLoop] runMode:NSDetaltRunLoopMode beforeDate:[NSDate distantFuture];

}