UIDatePicker日期选取器

//定义显示日期的格式
NSDateFormatter *dateFormat = [[NSDateFormatter alloc]init];
//NSDateFormatterMediumStyle的显示格式为:  Nov 23, 1937” or “3:30:32 PM
dateFormat.dateStyle = NSDateFormatterMediumStyle;
dateFormat.timeStyle = NSDateFormatterMediumStyle;
    
//获取事件选取器的值
NSDate *date = self.datePicker.date;
//将date按dateFormat的格式转换成NSString对象显示并赋给message
NSString *message = [dateFormat stringFromDate:date];

UIAlertController *dateAlert = [UIAlertController alertControllerWithTitle:@"提示" message:message preferredStyle:UIAlertControllerStyleAlert];
    
UIAlertAction *dateAction = [UIAlertAction actionWithTitle:@"Yes" style:UIAlertActionStyleDefault handler:nil];
    
[dateAlert addAction:dateAction];
    
[self presentViewController:dateAlert animated:YES completion:nil];