UIAlertView上添加View(UIDatePicker)

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:nil delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];

alert.delegate = self;

datePicker = [[UIDatePicker alloc] init];

datePicker.datePickerMode = UIDatePickerModeDate;

[alert setValue:datePicker forKey:@"accessoryView"];//关键句

[alert show];