Question

我正在编写一个骰子应用程序。如果我使用UIImage视图，我知道如何将图像更改为不同的骰子面。但是我想使用UIButton作为骰子，这样每次用户按下具有特定骰子面部图像的骰子按钮时，图像就会更新到另一个骰子图像。我知道如何使用arc4random随机更改图像，但我不知道如何在UIButton上应用相同的概念。

Answer 1

对于Swift 4，答案应该是：

sender.setBackgroundImage(UIImage(named: "Button-Normal"), for: UIControl.State.normal)

Answer 2

快速5

WITH RECURSIVE un_id AS (
    SELECT id
    FROM unit
    WHERE id = :idParent -- or parentid if you want to exclude the parent itself

    UNION

    SELECT unit.id
    FROM unit
    JOIN un_id
        ON unit.parentid = un_id.id
)
SELECT unl.name                          AS text,
       un.id                             AS value,
       (case
            when cast((select count(*) from employee where employee.unit_id = un.id) as varchar(10)) != '0'
                then cast(1 as Boolean)
            else cast(0 as BOOLEAN) end) as disabled
        ,
       cast(0 as varchar(10))            as favoriteNbr,
       cast(null as varchar(10))         as favoriteId
FROM un_id -- reference to the CTE
JOIN unit un
    USING (id)
LEFT OUTER JOIN unitlang unl ON unl.unit_id = un.id
Where unl.lang = :lang
order by app_order asc

Answer 3

@IBAction func myImageButton(_ sender: UIButton) {
sender.setImage(UIImage(named: "Button-Normal"), for: UIControlState.normal)
}

在swift中更改按钮背景图像

3 个答案: