自定义左右 UISegmentedControl 按钮

Question

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

我要更改以下segmentedControl：

类似于以下内容：

我想使用自定义图像的原因是我可以更改按钮的角。如果你看一下蓝色的分段控件，它更方正（我的图像有它自己的角）。

我在想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：

• 已选择段背景（这有左右大写）
  
• 未选择段背景（这有左右大写）
  
• 中间段，左侧选中，右侧未选中
  
• 中间段，左侧未选中，右侧选中
  
• 中间段，左右都选中
  
• 中间段，左右均未选中
  

然后用下面的代码来设置：

/* 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，您必须调整可拉伸图像中的大写大小以匹配您的图像。

Answer 2

Maurizio 的回答对我来说不太适合工具栏中的分段控件；由于分隔线图像不够宽，它一直在控件上显示这些虚线。

所以我自己做了。以下是 Xcode 所需的所有图像，我还将用于创建分段控制图像的 Photoshop 文件放入，以便您可以更改样式：

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

将它放在您的 AppDelegate 中，让它使用附加的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

您需要为所有片段制作一张背景图片，以及一个仅位于按钮左边缘的图像、一个连接两个按钮的图像以及一个位于右边缘的图像。其中一些需要为多个州完成。这是您的图片列表：

• 左帽，已选择
• 左帽，未选中
• 段背景，已选择
• 段背景，未选中
• 右帽，已选择
• 右帽，未选中
• 中帽，左选中右未选中
• 中帽，左侧未选中，右侧已选中
• 中间帽，均已选择
• 中间帽，均未选中

对于中间大写字母，您可以这样输入：（Apple 文档中的文本）。

// 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。