IOS 异步请求

最新推荐文章于 2024-11-19 22:58:57 发布

原创最新推荐文章于 2024-11-19 22:58:57 发布 · 589 阅读

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本文详细介绍了如何使用Objective-C语言通过发送HTTP请求获取网页内容，并将其保存到本地文件的过程。包括创建URL对象、构建URL请求、使用NSOperationQueue异步执行请求，以及处理响应数据和文件写入。

    NSString* urlAsString = @"http://www.apple.com";
    NSURL* url = [NSURL URLWithString:urlAsString];
    NSURLRequest* urlRequest = [NSURLRequest requestWithURL:url];
    
    NSOperationQueue* queue = [[NSOperationQueue alloc] init];
    
    [NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse* response,NSData* data,NSError* error){
        if ([data length] > 0 && error == nil) {
//            NSString* html = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
//            NSLog(@"HTML = %@",html);
            
            /* Get the documents directory */
            NSString* documentsDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
            /* Append the file name to the documents directory */
            NSString* filePath = [documentsDir stringByAppendingPathComponent:@"apple.html"];
            
            /* Write the data to the file */
            [data writeToFile:filePath atomically:YES];
            
            NSLog(@"Successfully saved the file to %@",filePath);
            
        }else if ([data length] == 0 && error == nil) {
            NSLog(@"Nothing was download");
        }else if (error != nil) {
            NSLog(@"Error happened = %@",error);
        }
    
    }];