移动UITabBarItem图像？ [英] Moving UITabBarItem Image down?

问题描述

通常在 UITabBar 的每个标签上，您都有一个小图片和一个命名标签的标题。图像位于标签顶部/居中，以容纳下方的标题。我的问题是：如果你想让tabBar只有一个图像，没有标题可以将图像向下移动，以便在标签内更好地居中？

Normally on each tab of a UITabBar you have a small image and a title naming the tab. The image is positioned/centred towards the top of the tab to accommodate the title underneath. My question is: if you want to have a tabBar with just an image and no title is there a way to move the image down so it centers better within the tab?

我目前正在使用（见下文）：

I am using (see below) currently:

[tabBarItem setFinishedSelectedImage:tabSelected withFinishedUnselectedImage:tabUnselected];

但是我更喜欢使用没有标题的更大图像，如果我把图像放大的话大约70pixels @ 2x它开始偏离 UITabBar 的顶部，同时在底部留下大量未使用的空间。

but would prefer to use to larger image with no title, at the moment if I make the image bigger than about 70pixels@2x it starts edging off the top of the UITabBar whilst leaving a lot of unused space at the bottom.

推荐答案

尝试调整 tabBarItem 的 imageInsets （用于移动图标图像）并将控制器标题设置为nil（因此不显示标题）。把这样的东西放到视图控制器中的 -init 或 -viewDidLoad 方法中：

Try adjusting tabBarItem's imageInsets (for moving the icon image) and setting the controllers title to nil (so no title is displayed). Put something like this to -init or -viewDidLoad method in view controller:

Objective-C

self.tabBarItem.imageInsets = UIEdgeInsetsMake(6, 0, -6, 0);
self.title = nil;

Swift

self.tabBarItem.imageInsets = UIEdgeInsets(top: 6, left: 0, bottom: -6, right: 0)
self.title = nil

UITabBarItem 是 UIBarItem的子类其中包含 UIEdgeInsets imageInsets 属性。使用插图播放一点，直到它看起来很好（取决于您的tabbar图标图像）

UITabBarItem is a subclass of UIBarItem which has UIEdgeInsets imageInsets property. Play a little with the insets until it looks good (depending on your tabbar icon images)

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