UIAlertMessage

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"完成注册" preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {

NSLog(@"取消");

}];

[alertController addAction:cancelAction];

[self presentViewController:alertController animated:YES completion:nil];