UIAlertView滚动问题

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"标题" message:@"较长的文本内容" preferredStyle:UIAlertControllerStyleAlert];
[alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
    textField.text = @"较长的文本内容";
    textField.enabled = NO;
}];
UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];
[alertController addAction:okAction];
[self presentViewController:alertController animated:YES completion:nil];

NSString *longText = @"较长的文本内容";
if (longText.length > 10) {
    longText = [longText substringToIndex:10];
    longText = [longText stringByAppendingString:@"..."];
}
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"标题" message:longText delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil];
[alertView show];