系统提示框

       UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:[NSString stringWithFormat:@"保存结果：%@ -- 租金 : %@", str,zujinshuru.text] preferredStyle:UIAlertControllerStyleAlert];

        [alert addAction:[UIAlertAction actionWithTitle:@"Sure" style:UIAlertActionStyleCancel handler:^(UIAlertAction *_Nonnull action) {

        }]];

        [self presentViewController:alert animated:true completion:nil];