当用作左侧或右侧导航栏项目时，带有自定义视图的 UIBarButtonItem 在 iOS 7 上未正确对齐 [英] UIBarButtonItem with custom view not properly aligned on iOS 7 when used as left or right navigation bar items

问题描述

以下代码适用于 iOS 6:

The following code works up through iOS 6:

UIButton *myButton = nil;
myButton = [UIButton buttonWithType:UIButtonTypeCustom];
myButton.bounds = CGRectMake(0,0,44,30);
// setup myButton's images, etc.

UIBarButtonItem *item = nil;
item = [[UIBarButtonItem alloc] initWithCustomView:customButton];

按钮应该这样对齐:

但是，在 iOS 7 上，按钮似乎向左或向右偏移了太多像素:

However, on iOS 7, the button appears to be offset from the right or left by too many pixels:

如何让我的自定义栏按钮项目正确对齐?

How can I get my custom bar button items to be aligned properly?

推荐答案

为了修复这个错误，你必须继承 UIButton 以便你可以覆盖 alignmentRectInsets.根据我的测试，您需要根据按钮位置返回带有正右偏移量或正左偏移量的 UIEdgeInsets.这些数字对我来说毫无意义(根据常识，至少其中一个应该是负数)，但这才是真正有效的:

In order to fix this bug, you must subclass UIButton so that you can override alignmentRectInsets. From my testing, you'll need to return a UIEdgeInsets with either a positive right offset or a positive left offset, depending on the button position. These numbers make no sense to me (at least one of them should be negative, according to common sense), but this is what actually works:

- (UIEdgeInsets)alignmentRectInsets {
    UIEdgeInsets insets;
    if (IF_ITS_A_LEFT_BUTTON) {
        insets = UIEdgeInsetsMake(0, 9.0f, 0, 0);
    } 
    else { // IF_ITS_A_RIGHT_BUTTON
        insets = UIEdgeInsetsMake(0, 0, 0, 9.0f);
    }
    return insets;
}

特别感谢@zev 建议我尝试调整alignmentRectInsets.

Special thanks to @zev for suggesting I try adjusting alignmentRectInsets.

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