ios 如何以编程方式调整 UIButton 内的图像大小？
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How to resize an image inside an UIButton programmatically?
提问by Elia Crocetta
I have this UIButton and an image to fit in. I don't want that the image take all the space inside the button but just a little part of it right in the center, but if I resize the button it will resize the image too. How can I do that, is there an option to set whatever dimension I want independently from the size of the UIButton? Thanks!
我有这个 UIButton 和一个适合的图像。我不希望图像占据按钮内的所有空间，而只是在中心的一小部分，但是如果我调整按钮的大小，它也会调整图像的大小. 我该怎么做，是否可以选择独立于 UIButton 的大小来设置我想要的任何尺寸？谢谢！
回答by KrishnaCA
This can be done through code in the following way:
这可以通过以下方式通过代码完成：
let imageSize:CGSize = CGSize(width: 20, height: 20)
let button:UIButton = UIButton(type: UIButton.ButtonType.custom)
button.frame = CGRect(x: 200, y: 200, width: 60, height: 60)
button.backgroundColor = UIColor.yellow
button.setImage(UIImage(named: "chat.png"), for: UIControl.State.normal)
// The below line will give you what you want
button.imageEdgeInsets = UIEdgeInsets(
top: (button.frame.size.height - imageSize.height) / 2,
left: (button.frame.size.width - imageSize.width) / 2,
bottom: (button.frame.size.height - imageSize.height) / 2,
right: (button.frame.size.width - imageSize.width) / 2)
self.view.addSubview(button)
This way, you can achieve what you wanted.
这样，您就可以实现您想要的。
回答by Maciej Chrzastek
You can experiment with image view insets. Every UIButton has a property imageView.
您可以尝试使用图像视图插图。每个 UIButton 都有一个属性 imageView。
In Swift 3 you can do this like so:
在 Swift 3 中，你可以这样做：
//let button = UIButton()
button.imageView?.backgroundColor = UIColor.red
button.imageEdgeInsets = UIEdgeInsetsMake(10, 10, 10, 10)
red background is just so you know what is changing
红色背景只是让你知道发生了什么变化
回答by KVISH
I would do it this way:
我会这样做：
A UIButtonis just a UIView. You can simply add a UIImageViewwith a set image and call addSubviewon the UIButton.
AUIButton只是一个UIView. 你可以简单地添加UIImageView了一组图像和呼叫addSubview上UIButton。
回答by Joule87
Taking into account what KVISH said before i have implemented this and it worked as expected. I posted this because Houman asked for an example.
考虑到 KVISH 在我实施之前所说的话，它按预期工作。我发布这个是因为侯曼要求举个例子。
//grab the image using the name of the pic
var image = UIImage(named: "picture")
//set the size for the image
image = image?.resize(toWidth: 18)
image = image?.resize(toHeight: 18)
//set the image to the button
buttonName.setImage(image, for: UIControlState.normal)
//adjust the position
buttonName.imageEdgeInsets = UIEdgeInsetsMake(8,16,9,0)
回答by Madavaram Ramesh
These can be achieved by adding imageEdgeInsets to a UIButton.
这些可以通过将 imageEdgeInsets 添加到 UIButton 来实现。
In swift4.2
在 swift4.2
button.imageEdgeInsets = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
