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iOS NSURLSessionDownloadTask 报错 Invalid resume data for background download. Bac

2018年01月30日  | 移动技术网移动技术  | 我要评论

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 

@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 

#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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