错误的Passbook-PKZip签名

Question

我运行代码，如下所示。当我得到文件（NSData）时，出现以下错误：

"BOM could not extract archive: Couldn't read PKZip signature"

发生了什么？有人遇到这个问题吗？我该怎么解决？

    NSString *url = [res objectForKey:@"url"];
    NSData *data = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:url]];    if (nil != data) {
    //init a pass library
    PKPassLibrary* passLib = [[PKPassLibrary alloc] init];
    NSError *error;
    //init a pass object with the data
    PKPass *pass = [[PKPass alloc] initWithData:data error:&error];
    if(error) {
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error" message:[error localizedDescription] delegate:nil cancelButtonTitle:@"OK"otherButtonTitles:nil];
    [alertView show];
    }
    //check if pass library contains this pass already
    if([passLib containsPass:pass]) {
        //pass already exists in library, show an error message
        UIAlertView* alertView = [[UIAlertView alloc] initWithTitle:@"Pass Exists" message:@"The pass you are trying to add to Passbook is already present." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alertView show];
    } else {
        //present view controller to add the pass to the library
        PKAddPassesViewController *vc = [[PKAddPassesViewController alloc] initWithPass:pass];
        [vc setDelegate:(id)self];
        [self presentViewController:vc animated:YES completion:nil];
    }
}

Answer 1

假设您尝试使用来自connectionDidReceiveData方法的NSData对象，这是错误的。您应该累积NSData对象，直到connectionDidFinishLoading。

你应该这样做：

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    if (self.passData != nil) {
        [self.passData appendData:data];
    }
    else {
        self.passData = [NSMutableData dataWithData:data];
    }
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
    NSError *error;
    PKPass *pass = [[PKPass alloc] initWithData:self.passData error:&error];
    //add pass
    self.passData = nil;
}

Answer 2

问题出在行

//init a pass object with the data
    PKPass *pass = [[PKPass alloc] initWithData:data error:&error];

下载的数据已损坏。

Answer 3

如果您能够通过电子邮件/Safari添加通行证，那么问题是由NSData对象引起的。

在我的例子中，pkpass文件base64字符串值是在我转换为NSData对象的设备上收到的。PKPass对象能够读取我的通行证。以下是我使用的代码：

// dictionary contains base64string values of the pkpass file.
for (NSString *key in [dictionary allKeys])
{
    NSError *error;
    NSData *decodedData = [[NSData alloc] initWithBase64EncodedString:[dictionary valueForKey:key] options:0];
    NSString *decodedString = [[NSString alloc] initWithData:decodedData encoding:NSUTF8StringEncoding];
    PKPass *pass = [[PKPass alloc] initWithData:decodedData error:&error];
    [arrPasses addObject:pass];
}
if ([arrPasses count] > 0)
{
    PKAddPassesViewController *vc = [[PKAddPassesViewController alloc] initWithPasses:arrPasses];
    [self presentViewController:vc animated:YES completion:nil];
}
else
{
    NSLog(@"Passes not found");
}

希望这能有所帮助！！