将 UITabBarItem Image 向下移动? [英] Moving UITabBarItem Image down?

问题描述

通常在 UITabBar 的每个选项卡上都有一个小图像和一个命名选项卡的标题.图像定位/居中朝向选项卡的顶部以容纳下方的标题.我的问题是:如果你想要一个只有一个图像而没有标题的 tabBar，有没有办法将图像向下移动以便它在选项卡内更好地居中?

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];

但更喜欢使用没有标题的更大图像，目前如果我使图像大于大约 70pixels@2x，它会开始从 UITabBar 的顶部边缘脱落，同时留下很多底部未使用的空间.

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(所以不显示标题).把这样的东西放在视图控制器中的 -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:

目标 C

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

迅捷

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

UITabBarItem 是 UIBarItem 的子类，它具有 UIEdgeInsets imageInsets 属性.稍微使用插图直到它看起来不错(取决于您的标签栏图标图像)

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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