异步调用使用IOS 4的方法

本文介绍了异步调用使用IOS 4的方法的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我要asynchronically调用一个方法。这是从服务器获取HTML并将它设置为一个方法的UIWebView ：

I want to call a method asynchronically. It's a method that gets HTML from a server and sets it to a UIWebView:

NSString *htmlTest = [BackendProxy getContent]; [webView loadHTMLString:htmlTest baseURL: nil]; [webView setUserInteractionEnabled:YES];

我想在数据读取开始在的UIWebView 一个活动的指标，所以我需要调用的getContent asynchronically。我怎样才能做到这一点？

I want to start an activity indicator in the UIWebView during the data fetch, so I need to call getContent asynchronically. How can I achieve that?

推荐答案

我建议 performSelectorInBackground：withObject： NSObject的。

这样的：

- (void)loadIntoWebView: (id) dummy { NSString *html = [BackendProxy getContent]; [self performSelectorOnMainThread: @selector(loadingFinished:) withObject: html]; } - (void)loadingFinished: (NSString*) html { // stop activity indicator [webView loadHTMLString:html baseURL: nil]; [webView setUserInteractionEnabled:YES]; } - (void) foo { // ... // start activity indicator [self performSelectorInBackground: @selector(loadIntoWebView:) withObject: nil]; }