1、WDFUploadDownload，新增downloadFileToDocument接口方法。

2、WDFMobileFile，重写getAllFile接口方法。

WadeMobileFunc/WadeMobileFunc/WDFMobileFile.m

@@ -202,17 +202,27 @@
 * 对应JS接口: Mobile.getAllFile:function(callback,type,err)
 */
- (void)getAllFile:(NSArray *)param {
    NSString *result = [self getAllFiles];
    
    [super callback:result];
    NSString *result;
    NSString *basePath = [WDUtility dirInDocument:FILE_TMP];
    if (!param || param.count == 0 || [param[0] isKindOfClass:[NSNull class]]) {
        result = [self getDirectionFiles:basePath];
    }else {
        NSString *relativeDirPath = param[0];
        NSString *dir = [basePath stringByAppendingPathComponent:relativeDirPath];
        result = [self getDirectionFiles:dir];
    }
    [self callback:result];
}
- (NSString *)getAllFiles {
    NSString *path = [WDUtility dirInDocument:FILE_TMP];
    return [self getDirectionFiles:path];
}
- (NSString *)getDirectionFiles:(NSString *)dirPath {
    NSFileManager *manager = [NSFileManager defaultManager];
    
    NSError *error = nil;
    NSArray *files = [manager contentsOfDirectoryAtPath:path error:&error];
    NSArray *files = [manager contentsOfDirectoryAtPath:dirPath error:&error];
    if (error) {
        NSLog(@"getAllFile Error:%@",error);
        return [NSString stringWithFormat:@"Errors occurred during reading files of directory. Details:%@.", [error description]];
@@ -220,7 +230,6 @@
    
    WDDataList *data = [[WDDataList alloc] init];
    [data addAll:files];
    
    return [data toString];
}

WadeMobileFunc/WadeMobileFunc/WDFUploadDownload.m

@@ -16,6 +16,8 @@
#import <IpuLib/AFNetworking.h>
#import <IpuLib/SDWebImageManager.h>
#define FILE_TMP   @"files"
@implementation WDFUploadDownload
/**
@@ -496,4 +498,36 @@
    [self callback: ret ? @"0" : @"1"];
}
- (void)downloadFileToDocument:(NSArray *)param {
    NSAssert(param && [param isKindOfClass:[NSArray class]] && param.count, @"参数错误");
    
    NSString *resPath = param[0];
    NSAssert(resPath && resPath.length, @"参数resPath错误");
    
    NSString *filePath = param[1];
    NSAssert(filePath && filePath.length, @"参数filePath错误");
    
    NSData *resData = [NSData dataWithContentsOfURL:[NSURL URLWithString:resPath]];
    NSAssert(resData && resData.length, @"下载失败");
    
    NSMutableString *filePathStr = [NSMutableString stringWithString:filePath];
    
    // 处理以“/”开头的路径
    if ([filePathStr hasPrefix:@"/"]) {
        filePathStr = [NSMutableString stringWithString:[filePathStr substringFromIndex:1]];
    }
    
    // 1.如果目录不存在，创建
    NSRange range = [filePathStr rangeOfString:@"/" options:NSBackwardsSearch];
    NSString *dir = [filePathStr substringToIndex:range.location];
    NSString *fileName = [filePathStr substringFromIndex:range.location];
    NSString *dirPath = [[WDUtility dirInDocument:FILE_TMP] stringByAppendingPathComponent:dir];
    NSString *savePath = [dirPath stringByAppendingString:fileName];
    
    // 2.将数据写到文件中
    BOOL ret = [resData writeToFile:savePath atomically:YES];
    
    [self callback:ret ? @"0" : @"1"];
}
@end