错误存折- PKZip签名

Question

我运行代码，如下所示。当我获取文件(NSData)时，出现以下错误：

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

这是怎么回事？有没有人遇到过这个问题，我该如何解决？

    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。您应该在connectionDidFinishLoading之前累积NSData对象。

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

问题出在这条线上

//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，那么问题就出在NSData对象上。

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

// 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！！