iOS NSURLSessionDownloadTask 报错 Invalid resume data for background download. Background downloads mu

骑猪看日落 2022-06-09 12:10 75阅读 0赞

错误： Invalid resume data for background download. Background downloads must use http or https and must download to an accessible file.

网上好多说这个错误在ios10中出现，如果调试的时候，点暂停下载，再重新发布到手机上，再点击开始下载，也会有这个错误。

解决办法：自定义一个NSURLSession分类，在ios10代替 \- (NSURLSessionDownloadTask \*)downloadTaskWithResumeData:(NSData \*)resumeData;

NSURLSession+TYCorrectedResumeData.h

#import <Foundation/Foundation.h>
    
    @interface NSURLSession (TYCorrectedResumeData)
    
    - (NSURLSessionDownloadTask *)downloadTaskWithCorrectResumeData:(NSData *)resumeData;
    
    @end

NSURLSession+TYCorrectedResumeData.m

//
    //  NSURLSession+TYCorrectedResumeData.m
    //  TYDownloadManagerDemo
    //
    //  Created by tanyang on 2016/10/7.
    //  Copyright © 2016年 tany. All rights reserved.
    //
    
    #import "NSURLSession+TYCorrectedResumeData.h"
    #import <UIKit/UIKit.h>
    
    #define IS_IOS10ORLATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 10)
    
    @implementation NSURLSession (TYCorrectedResumeData)
    
    - (NSURLSessionDownloadTask *)downloadTaskWithCorrectResumeData:(NSData *)resumeData {
        NSString *kResumeCurrentRequest = @"NSURLSessionResumeCurrentRequest";
        NSString *kResumeOriginalRequest = @"NSURLSessionResumeOriginalRequest";
        
        NSData *cData = correctResumeData(resumeData);
        cData = cData?cData:resumeData;
        NSURLSessionDownloadTask *task = [self downloadTaskWithResumeData:cData];
        NSMutableDictionary *resumeDic = getResumeDictionary(cData);
        if (resumeDic) {
            if (task.originalRequest == nil) {
                NSData *originalReqData = resumeDic[kResumeOriginalRequest];
                NSURLRequest *originalRequest = [NSKeyedUnarchiver unarchiveObjectWithData:originalReqData ];
                if (originalRequest) {
                    [task setValue:originalRequest forKey:@"originalRequest"];
                }
            }
            if (task.currentRequest == nil) {
                NSData *currentReqData = resumeDic[kResumeCurrentRequest];
                NSURLRequest *currentRequest = [NSKeyedUnarchiver unarchiveObjectWithData:currentReqData];
                if (currentRequest) {
                    [task setValue:currentRequest forKey:@"currentRequest"];
                }
            }
            
        }
        return task;
    }
    
    #pragma mark- private
    
    NSData * correctRequestData(NSData *data) {
        if (!data) {
            return nil;
        }
        // return the same data if it's correct
        if ([NSKeyedUnarchiver unarchiveObjectWithData:data] != nil) {
            return data;
        }
        NSMutableDictionary *archive = [[NSPropertyListSerialization propertyListWithData:data options:NSPropertyListMutableContainersAndLeaves format:nil error:nil] mutableCopy];
        
        if (!archive) {
            return nil;
        }
        NSInteger k = 0;
        id objectss = archive[@"$objects"];
        while ([objectss[1] objectForKey:[NSString stringWithFormat:@"$%ld",k]] != nil) {
            k += 1;
        }
        NSInteger i = 0;
        while ([archive[@"$objects"][1] objectForKey:[NSString stringWithFormat:@"__nsurlrequest_proto_prop_obj_%ld",i]] != nil) {
            NSMutableArray *arr = archive[@"$objects"];
            NSMutableDictionary *dic = arr[1];
            id obj = [dic objectForKey:[NSString stringWithFormat:@"__nsurlrequest_proto_prop_obj_%ld",i]];
            if (obj) {
                [dic setValue:obj forKey:[NSString stringWithFormat:@"$%ld",i+k]];
                [dic removeObjectForKey:[NSString stringWithFormat:@"__nsurlrequest_proto_prop_obj_%ld",i]];
                [arr replaceObjectAtIndex:1 withObject:dic];
                archive[@"$objects"] = arr;
            }
            i++;
        }
        if ([archive[@"$objects"][1] objectForKey:@"__nsurlrequest_proto_props"] != nil) {
            NSMutableArray *arr = archive[@"$objects"];
            NSMutableDictionary *dic = arr[1];
            id obj = [dic objectForKey:@"__nsurlrequest_proto_props"];
            if (obj) {
                [dic setValue:obj forKey:[NSString stringWithFormat:@"$%ld",i+k]];
                [dic removeObjectForKey:@"__nsurlrequest_proto_props"];
                [arr replaceObjectAtIndex:1 withObject:dic];
                archive[@"$objects"] = arr;
            }
        }
        // Rectify weird "NSKeyedArchiveRootObjectKey" top key to NSKeyedArchiveRootObjectKey = "root"
        if ([archive[@"$top"] objectForKey:@"NSKeyedArchiveRootObjectKey"] != nil) {
            [archive[@"$top"] setObject:archive[@"$top"][@"NSKeyedArchiveRootObjectKey"] forKey: NSKeyedArchiveRootObjectKey];
            [archive[@"$top"] removeObjectForKey:@"NSKeyedArchiveRootObjectKey"];
        }
        // Reencode archived object
        NSData *result = [NSPropertyListSerialization dataWithPropertyList:archive format:NSPropertyListBinaryFormat_v1_0 options:0 error:nil];
        return result;
    }
    
    NSMutableDictionary *getResumeDictionary(NSData *data) {
        NSMutableDictionary *iresumeDictionary = nil;
        if (IS_IOS10ORLATER) {
            id root = nil;
            id  keyedUnarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
            @try {
                root = [keyedUnarchiver decodeTopLevelObjectForKey:@"NSKeyedArchiveRootObjectKey" error:nil];
                if (root == nil) {
                    root = [keyedUnarchiver decodeTopLevelObjectForKey:NSKeyedArchiveRootObjectKey error:nil];
                }
            } @catch(NSException *exception) {
                
            }
            [keyedUnarchiver finishDecoding];
            iresumeDictionary = [root mutableCopy];
        }
        
        if (iresumeDictionary == nil) {
            iresumeDictionary = [NSPropertyListSerialization propertyListWithData:data options:NSPropertyListMutableContainersAndLeaves format:nil error:nil];
        }
        return iresumeDictionary;
    }
    
    NSData *correctResumeData(NSData *data) {
        NSString *kResumeCurrentRequest = @"NSURLSessionResumeCurrentRequest";
        NSString *kResumeOriginalRequest = @"NSURLSessionResumeOriginalRequest";
        if (data == nil) {
            return  nil;
        }
        NSMutableDictionary *resumeDictionary = getResumeDictionary(data);
        if (resumeDictionary == nil) {
            return nil;
        }
        resumeDictionary[kResumeCurrentRequest] = correctRequestData(resumeDictionary[kResumeCurrentRequest]);
        resumeDictionary[kResumeOriginalRequest] = correctRequestData(resumeDictionary[kResumeOriginalRequest]);
        NSData *result = [NSPropertyListSerialization dataWithPropertyList:resumeDictionary format:NSPropertyListXMLFormat_v1_0 options:0 error:nil];
        return result;
    }
    
    @end

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[Link 1]: http://blog.csdn.net/dashenid/article/details/77853511