[移动开发]IOS开发之——AFN-文件下载(03)

一 概述

• AFN如何下载文件
• AFN下载文件示例

二 AFN如何下载文件

2.1 AFN下载文件的过程

• 创建AFURLSessionManager或AFHTTPSessionManager
• Manager执行downloadTask方法
• 调用downloadTask resume执行下载任务

2.2 创建Manager

方法一

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

方法二

AFHTTPSessionManager *mgr=[AFHTTPSessionManager manager];

2.3 downloadTask

downloadTaskWithRequest

[mgr downloadTaskWithRequest:request progress:nil destination:destPaht completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
        
}];

downloadTaskWithResumeData

[mgr downloadTaskWithResumeData:data progress:nil destination:destPath completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
        
 }];

三 AFN下载文件示例

3.1 代码

-(void)HttpManagerDownload
{
    NSURL *url=[NSURL URLWithString:@"http://localhost:8080//MJServer/resources/videos/minion_01.mp4"];
    //2-请求
    NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url];
    
    AFHTTPSessionManager *mgr=[AFHTTPSessionManager manager];
    NSURLSessionDownloadTask *task= [mgr downloadTaskWithRequest:request progress:nil destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
        NSURL *cacheURL= [[[NSFileManager defaultManager]URLsForDirectory:NSCachesDirectory inDomains:NSUserDomainMask]lastObject];
        return [cacheURL URLByAppendingPathComponent:[response suggestedFilename]];
    } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
        NSLog(@"File downloaded to: %@", filePath);
        
    }];
    [task resume];
}

3.2 执行结果

2022-03-20 14:02:43.197326+0800 AFN-Demo1[18193:292275] File downloaded to: file:///Users/zxc/Library/Developer/CoreSimulator/Devices/FA145B46-0D5E-4C75-87A3-39AB48C1A87A/data/Containers/Data/Application/B213C405-2E7C-48FC-9D6D-58FDD4C18A49/Library/Caches/minion_01.mp4