如何在Swift中将图像居中而不在两个方向上都在UIButton中居中? [英] How to center an image inside an UIButton without stretching in both direction in Swift?

问题描述

我正在制作自定义键盘，我需要将Shift图标的图像居中于Shift按钮内.图片为100像素x 100像素.

I am making a custom keyboard and I need to centre the image of the shift icon inside the shift button. The image is 100px x 100px.

但是，纵向的按钮框为 36pt x 38pt ，而在横向的按钮框为 68pt x 32pt .我尝试使用按钮图像插入属性将图像居中.但是，事实并非如此.

However, the button frame in portrait is 36pt x 38pt, and in landscape, it is 68pt x 32pt. I have tried using button image inset property to centre the image. However, it does not does so.

我尝试了一下，并将图像边缘插图设置为(25,25,25,25)，图像的中心在这两种尺寸下.但是，图标变得太小而看不到.

I tried myself and set the image edge insets to (25,25,25,25), the image centres in both sizes. However, the icon becomes too small to see.

shiftButton.setImage(UIImage(named: "shift"), forState: .Normal)

shiftButton.imageEdgeInsets = UIEdgeInsetsMake(0,0,0,0)

我正在按编程方式制作按钮.而且，我需要该按钮缩放比例以保持其宽高比，即 1:1 .其最大宽度或高度始终与按钮本身的高度相关.图片宽度/高度应为按钮高度的最大值.并且，它不应以任何方式拉伸以使图标变形.但是，按钮本身可以拉伸.

I am making the button programatically. And, I need the button to scale maintaining its aspect ratio i.e. 1:1. Its maximum width or height is always tied to the button's height itself. The image width/height should be maximum of button's height. And, it should not stretch in any way to distort the icon. However, the button itself can stretch.

我需要根据按钮框缩放图像，但要保持其宽高比.而且，它可以缩小或放大，但应始终保持1:1的宽高比.

I need the image to scale according to button frame but maintain its aspect ratio. And, it can down scale or up scale, but should always maintain the 1:1 aspect ratio.

有解决此问题的建议吗?

Any suggestions for solving this problem?

推荐答案

最后解决了一个问题.您必须在UIButton内设置图像的内容模式.

Finally a solution came through. You must set the content mode for the image inside the UIButton.

解决方案是，当您在按钮内使用前景图像以及菜单的 contentMode 时，更新 Image 的 contentMode . UIButton .

The solution is to update the contentMode of the Image when you are using a foreground image inside a button along with the contentMode of the UIButton.

shiftButton.contentMode = .Center
shiftButton.imageView?.contentMode = .ScaleAspectFit

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