zoukankan      html  css  js  c++  java
  • AFNetworking 2.0 出现Use of undeclared identifier AFURLSessionManager错误

    当向下面使用时会出现错误

    #import "AFNetworking.h"
    #import "AFURLSessionManager.h"
    
    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

    主要原因是NSURLSession模块仅支持ios7,打开AFURLSessionManager.h会看到一个宏

    #if (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED >= 70000) || (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1090)

    AFURLSessionManager只支持ios7和macosx10.9.0故创建下载任务时

    -(void)download:(NSString *)url complete:(void(^)(id result,NSError *error))success{
    #if (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED >= 70000) || (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1090)
        NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
        
        AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
        
        NSURL *URL = [NSURL URLWithString:url];
        NSURLRequest *request = [NSURLRequest requestWithURL:URL];
        
        NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
            NSURL *documentsDirectoryPath = [NSURL fileURLWithPath:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]];
            return [documentsDirectoryPath URLByAppendingPathComponent:[targetPath lastPathComponent]];
        } completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
            NSLog(@"File downloaded to: %@", filePath);
            if (error) {
                success(nil,error);
            }else{
                success(filePath,nil);
            }
        }];
        [downloadTask resume];
    #else
        NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:url]];
        AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *path = [[paths objectAtIndex:0] stringByAppendingPathComponent:[url lastPathComponent]];
        operation.outputStream = [NSOutputStream outputStreamToFileAtPath:path append:NO];
        [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
            NSLog(@"Successfully downloaded file to %@", path);
             success(path,nil);
        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
            NSLog(@"Error: %@", error);
            success(nil,error);
        }];
        [operation start];
    #endif
    }
  • 相关阅读:
    归一化与标准化的概念与区别
    深度学习中的优化器学习
    yolo3与yolo-tiny
    给tensorflow1.x estimator 添加timeline分析性能
    python 爬取百度图片
    TensorFlow 高性能数据输入管道设计指南
    TensorRT加速tensorflow模型(使用Tensorflow内置tensorRT,避免写自定义Plugin)
    21.Pod的limit和request和资源监控收集服务Heapster
    20.调度器,预选策略和优选策略
    8.docker的安全性
  • 原文地址:https://www.cnblogs.com/xiongqiangcs/p/3465092.html
Copyright © 2011-2022 走看看