异步下载图片
异步下载图片ASIHTTPRequest *requestX = [ASIHTTPRequest requestWithURL:url];
self.request = requestX;
[self.request setDelegate:self];
[self.request startAsynchronous]; [self performSelector:@selector(downLoadWithURLStr:) withObject:self.URLStr afterDelay:1]; if ([delegate_ respondsToSelector:@selector(SpecialDownLoad:ReceiveData:fromURLStr:)]) {
[delegate_ SpecialDownLoad:self ReceiveData:[arequest responseData] fromURLStr:self.URLStr];
}