ios - 无法在ios中下载文件

Question

这是我下载一本书的代码

- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
{
    NSString *resourceDocPath = [[NSString alloc] initWithString:[[[[NSBundle mainBundle]resourcePath] stringByDeletingLastPathComponent] stringByAppendingPathComponent:@"Documents"]];

    NSString *filePath= [resourceDocPath stringByAppendingPathComponent:_bookname];//in _bookname i am already  getting the value ,say abcd.pdf

    NSLog(@"The bookfilepath is %@",filePath);

    NSLog(@"the lenght of recieved data is %d", _recievedData.length);//here i get the correct file size also 

    [_recievedData writeToFile:filePath atomically:YES];

    NSFileManager *filemgr;

    filemgr = [NSFileManager defaultManager];

    if ([filemgr fileExistsAtPath: filePath] == YES)
    {
        flag=1;
        NSLog (@"File exists");
    }
    else
    {
        NSLog (@"File not found");  //always this happens in the log
    }
}

filePath 处不存在文件。为什么？有趣的是 _recievedData.length 返回了正确的文件大小。

Answer 1

因为你不能写入应用程序包([[NSBundle mainBundle] resourcePath])。

改为写入文档文件夹。