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     UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"标题" message:@"注释信息,没有就写nil" preferredStyle:UIAlertControllerStyleAlert];
    
    UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"标题1" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"点击了按钮1，进入按钮1的事件");
        //textFields是一个数组，获取所输入的字符串
        NSLog(@"%@",alert.textFields.lastObject.text);
    }];
    
    UIAlertAction *action2 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"点击了取消");
    }];
    
    [alert addAction:action1];
    [alert addAction:action2];