AFNetworking实现文件下载

#import "ViewController.h"

#import "AFNetworking/AFNetworking.h"

@interface ViewController ()

@end

@implementation ViewController


-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=3782685451,3066622536&fm=27&gp=0.jpg"]];
    
    NSURLSessionDownloadTask *downTask = [manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) {
        //打印下载进度
        NSLog(@"%f",1.0 * downloadProgress.completedUnitCount/downloadProgress.totalUnitCount);
    } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
        
        NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
        NSString *fullPath = [filePath stringByAppendingPathComponent:response.suggestedFilename];
        
        NSLog(@"%@",fullPath);
        return [NSURL fileURLWithPath:fullPath];
        
    } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
        
        NSLog(@"%@",filePath);
        NSLog(@"completionHandler----%@",error);
        
    }];
    
    [downTask resume];
    
}

@end