定制左和右正确的UISegmentedControl按钮

Question

我正在尝试自定义以下分段控件，第一个按钮使用左图像，第二个按钮使用右图像。我如何使用UIAppearance做到这一点？

我想更改以下segmentedControl：

类似下面的内容：

我想使用自定义图像的原因是我可以更改按钮的角落。如果你看一下蓝色分段控件，它会更加平方（我的图像有它自己的角落）。

我在考虑这样的事情，但没有用：

UIImage *leftImage = [[UIImage imageNamed:@"leftControl.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 15, 0, 15)];
UIImage *rightImage = [[UIImage imageNamed:@"rightControl.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 15, 0, 15)];

[[UISegmentedControl appearance] setBackgroundImage:leftImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault ];
[[UISegmentedControl appearance] setBackgroundImage:rightImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

Answer 1

您需要提供以下图片：

• 选择了段背景（这有左右两个上限）
  
• 未选中的段背景（左下角有左右）
  
• 段中间，左侧选中，右侧未选中
  
• 段中间，左侧未选中，右侧选中
  
• 段中间，左侧和左侧正确选择
  
• 段中间，左侧和左侧没有选中
  

然后使用以下代码进行设置：

/* Unselected background */
UIImage *unselectedBackgroundImage = [[UIImage imageNamed:@"segment_background_unselected"] resizableImageWithCapInsets:UIEdgeInsetsMake(10, 10, 10, 10)];
[[UISegmentedControl appearance] setBackgroundImage:unselectedBackgroundImage
                                           forState:UIControlStateNormal
                                         barMetrics:UIBarMetricsDefault];

/* Selected background */
UIImage *selectedBackgroundImage = [[UIImage imageNamed:@"segment_background_selected"] resizableImageWithCapInsets:UIEdgeInsetsMake(10, 10, 10, 10)];
[[UISegmentedControl appearance] setBackgroundImage:selectedBackgroundImage
                                           forState:UIControlStateSelected
                                         barMetrics:UIBarMetricsDefault];

/* Image between two unselected segments */
UIImage *bothUnselectedImage = [[UIImage imageNamed:@"segment_middle_unselected"] resizableImageWithCapInsets:UIEdgeInsetsMake(15, 0, 15, 0)];
[[UISegmentedControl appearance] setDividerImage:bothUnselectedImage
                             forLeftSegmentState:UIControlStateNormal
                               rightSegmentState:UIControlStateNormal
                                      barMetrics:UIBarMetricsDefault];

/* Image between segment selected on the left and unselected on the right */
UIImage *leftSelectedImage = [[UIImage imageNamed:@"segment_middle_left_selected"] resizableImageWithCapInsets:UIEdgeInsetsMake(15, 0, 15, 0)];
[[UISegmentedControl appearance] setDividerImage:leftSelectedImage
                             forLeftSegmentState:UIControlStateSelected
                               rightSegmentState:UIControlStateNormal
                                      barMetrics:UIBarMetricsDefault];

/* Image between segment selected on the right and unselected on the left */
UIImage *rightSelectedImage = [[UIImage imageNamed:@"segment_middle_right_selected"] resizableImageWithCapInsets:UIEdgeInsetsMake(15, 0, 15, 0)];
[[UISegmentedControl appearance] setDividerImage:rightSelectedImage
                             forLeftSegmentState:UIControlStateNormal
                               rightSegmentState:UIControlStateSelected
                                      barMetrics:UIBarMetricsDefault];

请注意，您必须调整可伸缩图像中的大小以匹配您的图像。

Answer 2

Maurizio的答案对我来说并不适用于工具栏中的分段控件;由于分频器图像不够宽，它一直在控制器上显示这些虚线。

所以我自己做了。以下是Xcode所需的所有图像，我还在Photoshop文件中创建了分段控制图像，以便您可以更改样式：

https://s3.amazonaws.com/iwasrobbed/stackoverflow/Custom+Segmented+Control.zip

将它放在AppDelegate中，让它使用附加图像更改工具栏中所有分段控件的外观：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [self customizeAppAppearance];
}

- (void)customizeAppAppearance
{
    // Toolbar
    [[UIToolbar appearance] setBackgroundImage:[[UIImage imageNamed:@"toolbar.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(22, 5, 22, 5)] forToolbarPosition:UIToolbarPositionAny barMetrics:UIBarMetricsDefault];

    // Segmented Controls within Toolbars

    // Unselected background
    UIImage *unselectedBackgroundImage = [[UIImage imageNamed:@"segmentInactive.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(15, 15, 15, 15)];
    [[UISegmentedControl appearanceWhenContainedIn:[UIToolbar class], nil] setBackgroundImage:unselectedBackgroundImage
                                                                                     forState:UIControlStateNormal
                                                                                   barMetrics:UIBarMetricsDefault];

    // Selected background
    UIImage *selectedBackgroundImage = [[UIImage imageNamed:@"segmentActive.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(15, 15, 15, 15)];
    [[UISegmentedControl appearanceWhenContainedIn:[UIToolbar class], nil] setBackgroundImage:selectedBackgroundImage
                                                                                     forState:UIControlStateSelected
                                                                                   barMetrics:UIBarMetricsDefault];

    // Image between two unselected segments
    UIImage *bothUnselectedImage = [[UIImage imageNamed:@"segmentBothInactive.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(15, 10, 15, 10)];
    [[UISegmentedControl appearanceWhenContainedIn:[UIToolbar class], nil] setDividerImage:bothUnselectedImage
                                                                       forLeftSegmentState:UIControlStateNormal
                                                                         rightSegmentState:UIControlStateNormal
                                                                                barMetrics:UIBarMetricsDefault];

    // Image between segment selected on the left and unselected on the right
    UIImage *leftSelectedImage = [[UIImage imageNamed:@"segmentLeftActiveRightInactive.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(15, 0, 15, 0)];
    [[UISegmentedControl appearanceWhenContainedIn:[UIToolbar class], nil] setDividerImage:leftSelectedImage
                                                                       forLeftSegmentState:UIControlStateSelected
                                                                         rightSegmentState:UIControlStateNormal
                                                                                barMetrics:UIBarMetricsDefault];

    // Image between segment selected on the right and unselected on the left
    UIImage *rightSelectedImage = [[UIImage imageNamed:@"segmentRightActiveLeftInactive.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(15, 0, 15, 0)];
    [[UISegmentedControl appearanceWhenContainedIn:[UIToolbar class], nil] setDividerImage:rightSelectedImage
                                                                       forLeftSegmentState:UIControlStateNormal
                                                                         rightSegmentState:UIControlStateSelected
                                                                                barMetrics:UIBarMetricsDefault];
}

Answer 3

您需要制作一个适用于所有片段的背景图像，以及仅作为按钮左边缘的图像，作为两个按钮之间的连接的图像以及作为右边缘的图像。其中一些需要针对多个州进行。所以这是你的图片列表：

• 左上角，已选中
• 左上角，未选中
• 细分背景，已选中
• 细分背景，未选中
• 右上角，已选中
• 右上限，未选中
• 中间上限，左选右未选中
• 中间上限，左侧未选中，右侧选中
• 中间上限，均已选中
• 中间盖，均未选中

对于中间大写，您可以将它们放入：（来自Apple文档的文本）。

// Image between two unselected segments.
[mySegmentedControl setDividerImage:image1 forLeftSegmentState:UIControlStateNormal
              rightSegmentState:UIControlStateNormal barMetrics:barMetrics];
// Image between segment selected on the left and unselected on the right.
[mySegmentedControl setDividerImage:image1 forLeftSegmentState:UIControlStateSelected
              rightSegmentState:UIControlStateNormal barMetrics:barMetrics];
// Image between segment selected on the right and unselected on the right.
[mySegmentedControl setDividerImage:image1 forLeftSegmentState:UIControlStateNormal
              rightSegmentState:UIControlStateSelected barMetrics:barMetrics];

如果您使用UIAppearance，显然您会将这些消息发送到外观代理。