錯誤存折 - PKZip簽名

Question

我運行代碼，如下所述。 當我收到文件（NSData）時，出現以下錯誤：

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

怎么了？ 有沒有人有這個問題，我該如何解決？

    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

假設您嘗試使用來自connectionDidReceiveData方法的NSData對象，這是錯誤的。 您應該累積NSData對象，直到connectionDidFinishLoading。

你應該做這樣的事情：

-(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

問題就在於此

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

下載的數據已損壞。

Answer 3

如果您能夠通過電子郵件/ Safari添加傳遞，則問題是由NSData對象引起的。

在我的例子中，pkpass文件base64字符串值在我轉換為NSData對象的設備上收到。 PKPass對象能夠讀取我的傳球。 以下是我使用的代碼：

// 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");
}

希望這可以幫助！！