iphone - 是否-dataWithContentsOfURL : of NSData work in a background thread?

Question

NSData 的 -dataWithContentsOfURL: 是否在后台线程中工作？

Answer 1

不，事实并非如此。

为了从 URL 异步获取数据，您应该使用 NSURLRequest 和 NSURLConnection 方法。

您必须实现 NSURLConnectionDelegate 方法:

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;
-(void)connectionDidFinishLoading:(NSURLConnection *)connection;
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error;