MFMailComposeViewController提起NSException

Question

我已经做了这个问题的搜索，但没有找到答案，这导致我写我的第一个问题在这里。

问题是，当我按下下面调用metho的按钮时，我在这一行上得到了一个异常：[self presentModalViewController:mailViewController animated:YES];，而异常是：

*由于“NSInvalidArgumentException”异常终止应用程序，原因：'-NSCFString计数:发送到实例0x20f6c的未识别选择器‘

此外，如果这有帮助的话，我正在模拟器上运行我的应用程序。

我从这里获得了代码的大部分内容。

这是我的代码(删除电子邮件地址)：

    // set up the email address array
    NSArray *email = [[NSArray alloc] initWithObjects:@"foo", nil];

    // Set up the view controller
    MFMailComposeViewController *mailViewController = [[MFMailComposeViewController alloc] init];
    mailViewController.mailComposeDelegate = self;

    // Set up the email to send to
    [mailViewController setSubject:@"foo"];
    [mailViewController setToRecipients:[email objectAtIndex:0]];

    // Get the path to the plist
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsPath = [paths objectAtIndex:0];  
    NSString *path = [documentsPath stringByAppendingPathComponent:@"foo.plist"];

    // Get the plist from the path
    NSData *myData = [NSData dataWithContentsOfFile:path];
    [mailViewController addAttachmentData:myData mimeType:@"plist" fileName:@"foo"];

    // Fill out the email body text 
    NSString *emailBody = @"Attached PLIST file";
    [mailViewController setMessageBody:emailBody isHTML:NO];

    // Release the array
    [email release];

    if (mailViewController != nil) {
        [self presentModalViewController:mailViewController animated:YES];
        [mailViewController release];
    }

是什么导致了这一异常？

Answer 1

在setToRecipients中，必须指定数组，而不是字符串。这样你就可以通过你的email-array。

Answer 2

-(IBAction)btnemail:(id)sender{
MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
picker.mailComposeDelegate = self;

[picker setSubject:@"subject"];
NSString *emailid=btnEmail.titleLabel.text;
NSArray *toRecipients = [NSArray arrayWithObject:emailid];
[picker setToRecipients:toRecipients];

NSString *emailBody = @"";
[picker setMessageBody:emailBody isHTML:NO];

if ([MFMailComposeViewController canSendMail]) {
    [self.parentViewController presentModalViewController:picker animated:YES];
}else {

}
[picker release];

}