如何在触摸时禁用UIButton图像的颠倒翻转？ [英] How to disable upside-down fliping of UIButton image when it's touched?

问题描述

我为UIButton为UIControlStateNormal设置了一个图像，如果我按下此按钮，图像会被遮挡并翻转到我持有它的时间。

I seted an image for UIButton for "UIControlStateNormal" and if I press this button the image is shadowed and flips upside down for the time that i hold it.

阴影是可以的，但如果我不想设置状态为UIControlStateHighlighted的自定义图像，如何禁用滑动？
感谢您的帮助

Shadowing is ok, but how can I disable the fliping, if I dont want to set a custom image fo state "UIControlStateHighlighted" ? Thanks for help

制作按钮的代码是：

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.tag=i;
        [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
        button.frame = CGRectMake(xakt, yakt, a, b);

然后我用 - （void）setImage设置按钮图像： （UIImage *）image forState：（UIControlState）state function。
我包括2张图片，第一张是正常状态，第二张是处于按下状态

and after that I set the button image with - (void)setImage:(UIImage *)image forState:(UIControlState)state function. I included 2 images, first in normal state, the second in pressed state

推荐答案

我对上述这种行为的观察（单击按钮时图像反转）仅限于以下情况：

My observation of this behavior described above (image on button inverts when clicked) is limited to the following situations:

1. 按钮的图像使用
   设置 - （void）setBackgroundImage：（UIImage *）image forState：（UIControlState）state 状态为 UIControlStateNormal 。

这种情况可能不是必需的，但是 UIImage 的imageOrientation 是 UIImageOrientationDown 。

This condition is likely not required but the imageOrientation of the UIImage is UIImageOrientationDown.

指定其余两个控制状态的背景图像可以解决问题。

Specifying the background image for two remaining control states should fix the problem.

UIButton *button = ...
UIImage *image = ...
[button setBackgroundImage:image forState:UIControlStateNormal];
// Specify same image for selected / highlighted states
[button setBackgroundImage:image forState:UIControlStateSelected];
[button setBackgroundImage:image forState:UIControlStateHighlighted];

请注意：

[button setBackgroundImage:image
                  forState:UIControlStateNormal |
                           UIControlStateSelected |
                           UIControlStateHighlighted];

不起作用。

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