iphone – MFMessageComposeViewController在iOS7中显示空白屏幕

以下是我正在使用的现有代码,

NSArray * recipients;

for (NSIndexPath * index in selectedRows) 
{ 
   NSDictionary *dictionary = [data objectAtIndex:index.row];
   NSString *phoneNum =  [dictionary objectForKey:@"contactNum"];
   recipients = [NSArray arrayWithObjects:phoneNum,nil]];
}

MFMessageComposeViewController *controller = [[MFMessageComposeViewController alloc] init];

if([MFMessageComposeViewController canSendText])
{
    controller.body = bodyOfMessage;
    controller.recipients = recipients;
    controller.messageComposeDelegate = self ;
    controller.wantsFullScreenLayout = NO;
    [(id)_delegate presentModalViewController:controller animated:YES];
    [[UIApplication sharedApplication] setStatusBarHidden:YES];
}

以下是我尝试发送给许多人时收到的输出消息.

timed out waiting for fence barrier from com.apple.mobilesms.compose
Received memory warning.
Received memory warning.
Received memory warning.
Received memory warning.
Received memory warning.
Received memory warning.
Received memory warning.
Received memory warning.
Received memory warning.