#define SHOWALERT(MESSAGE) \UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:MESSAGE preferredStyle:UIAlertControllerStyleAlert]; \UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil]; \[alertController addAction:okAction]; \UIViewController *vc = [UIApplication sharedApplication].windows[0].rootViewController;\[vc presentViewController:alertController animated:YES completion:nil];