objective-c 如何在objective-c中更改viewController的背景颜色
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how to change the background color of the viewController in objective-c
提问by uttam
how to change the backgrond color of view controller from other controller in the app ?
如何从应用程序中的其他控制器更改视图控制器的背景颜色？
回答by Liam
To change the background color of a 'view' you need to set the backgroundColor property on it. This implies that you have access to it. If it was all in one controller you would just use
要更改“视图”的背景颜色，您需要在其上设置 backgroundColor 属性。这意味着您可以访问它。如果这一切都在一个控制器中，您只需使用
self.view.backgroundColor = [UIColor redColor];
If it was in a navigation or similar based app, then you can access a views parentViewController and change the color on it as follows:
如果它在导航或类似的基于应用程序中，那么您可以访问视图 parentViewController 并按如下方式更改其颜色：
self.parentViewController.view.backgroundColor = [UIColor redColor];
If this is not possible then you can set an iVar on the second view controller when it is created that contains the instance of the viewController that you want to change the background color on.
如果这是不可能的，那么您可以在创建第二个视图控制器时在它上设置一个 iVar，其中包含要更改背景颜色的视图控制器的实例。
MyViewController* secondViewController = [[MyViewController alloc] init];
secondViewController.bgColorNeedsChangingViewController = self;
Then in the secondViewController's logic
然后在secondViewController的逻辑中
self.bgColorNeedsChangingViewController.view.backgroundColor = [UIColor redColor];
回答by user1898829
UIColor *colour = [[UIColor alloc]initWithRed:57.0/255.0 green:156.0/255.0 blue:52.0/255.0 alpha:1.0];
self.view.backgroundColor = colour;
Adapted from Frank Shearar's answer.
改编自 Frank Shearar 的回答。
回答by Frank Shearar
UIViewController *yourVC;
UIColor *colour = [[UIColor alloc] initWithRed: 1.0 green: 0.0 blue: 0.0 alpha: 1.0];
[yourVC.view.backgrounColor] = colour;
[colour release];
回答by Chandra Kanth
For changing the background color of a viewuse this single line of code
要更改视图的背景颜色，请使用这行代码
self.view.backgroundColor = UIColor (red: 1.0, green: 1.0, blue: 0.5, alpha: 1.0)
The values of red, green, blue and alpha vary btw 0 to 1.
红、绿、蓝和 alpha 的值在0 到 1 之间变化。
You can also write it as
你也可以把它写成
self.view.backgroundColor = UIColor (red: 123.0/255.0, green: 200.0/255.0, blue: 90.0/255.0, alpha: 1.0)
This is in the entire range of color scheme.
这是在整个配色方案范围内。
