blocks|key|1248455|text|对于要达到的目标，请始终在索引0处插入。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1248456|最近我给文章写了一篇关于这类事情的文章，你可能会觉得很有趣。|offset|length|1248457|entityMap|0|LINK|mutability|MUTABLE|url|http://blog.hawkimedia.com/2011/11/ui-polish-in-an-instant/^0|0|4|2|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

For what you are trying to achieve, always insert at index 0.

I wrote <a href="http://blog.hawkimedia.com/2011/11/ui-polish-in-an-instant/" rel="noreferrer">an article</a> about this sort of thing recently that you may find interesting.

blocks|key|1248474|text|将其添加到自定义按钮的层：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1248475|CAGradientLayer+*gradientLayer+=+[CAGradientLayer+layer];
gradientLayer.frame+=+customButton.layer.bounds;

gradientLayer.colors+=+[NSArray+arrayWithObjects:
++++++++++++++++++++++++(id)[UIColor+colorWithWhite:1.0f+alpha:0.1f].CGColor,
++++++++++++++++++++++++(id)[UIColor+colorWithWhite:0.4f+alpha:0.5f].CGColor,
++++++++++++++++++++++++nil];

gradientLayer.locations+=+[NSArray+arrayWithObjects:
+++++++++++++++++++++++++++[NSNumber+numberWithFloat:0.0f],
+++++++++++++++++++++++++++[NSNumber+numberWithFloat:1.0f],
+++++++++++++++++++++++++++nil];

gradientLayer.cornerRadius+=+customButton.layer.cornerRadius;
[customButton.layer+addSublayer:gradientLayer];|code-block|syntax|javascript|1248476|其中customButton是您的自定义UIButton。|offset|length|style|CODE|1248477|entityMap^0|0|0|2|C|K|8|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

Add it to the layer of your custom button:

<pre><code>CAGradientLayer *gradientLayer = [CAGradientLayer layer];
gradientLayer.frame = customButton.layer.bounds;

gradientLayer.colors = [NSArray arrayWithObjects:
 (id)[UIColor colorWithWhite:1.0f alpha:0.1f].CGColor,
 (id)[UIColor colorWithWhite:0.4f alpha:0.5f].CGColor,
 nil];

gradientLayer.locations = [NSArray arrayWithObjects:
 [NSNumber numberWithFloat:0.0f],
 [NSNumber numberWithFloat:1.0f],
 nil];

gradientLayer.cornerRadius = customButton.layer.cornerRadius;
[customButton.layer addSublayer:gradientLayer];
</code></pre>

where <code>customButton</code> is your custom <code>UIButton</code>.

blocks|key|1248503|text|以下是实现这一目标的代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1248504|CAGradientLayer+*gradient+=+[CAGradientLayer+layer];
gradient.frame+=+<#View+Variable+Name#>.bounds;
gradient.colors+=+[NSArray+arrayWithObjects:(id)([UIColor+colorWithRed:0.337+green:0.596+blue:1.000+alpha:1.000].CGColor),(id)([UIColor+colorWithRed:0.757+green:0.459+blue:1.000+alpha:1.000].CGColor),(id)([UIColor+colorWithRed:0.310+green:0.835+blue:1.000+alpha:1.000].CGColor),nil];
gradient.startPoint+=+CGPointMake(0.5,0.0);
gradient.endPoint+=+CGPointMake(0.5,1.0);
[<#View+Variable+name#>.layer+insertSublayer:gradient+atIndex:0];|code-block|syntax|javascript|1248505|我得到了这个工具，它可以方便地选择您的颜色，并自动输出代码的梯度。非常方便，我每天都用itunes.apple.com/gb/app/gradient-creator/id1031070259?mt=12|offset|length|1248506|entityMap|0|LINK|mutability|MUTABLE|url|https://itunes.apple.com/gb/app/gradient-creator/id1031070259?mt=12^0|0|0|17|1N|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Here is the code to achieve this

<pre><code>CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = &lt;#View Variable Name#&gt;.bounds;
gradient.colors = [NSArray arrayWithObjects:(id)([UIColor colorWithRed:0.337 green:0.596 blue:1.000 alpha:1.000].CGColor),(id)([UIColor colorWithRed:0.757 green:0.459 blue:1.000 alpha:1.000].CGColor),(id)([UIColor colorWithRed:0.310 green:0.835 blue:1.000 alpha:1.000].CGColor),nil];
gradient.startPoint = CGPointMake(0.5,0.0);
gradient.endPoint = CGPointMake(0.5,1.0);
[&lt;#View Variable name#&gt;.layer insertSublayer:gradient atIndex:0];
</code></pre>

I got this tool that makes it easy to select your colors and automatically output the code for the gradient. Very handy I use it everyday
 <a href="https://itunes.apple.com/gb/app/gradient-creator/id1031070259?mt=12" rel="nofollow">itunes.apple.com/gb/app/gradient-creator/id1031070259?mt=12</a>

blocks|key|614849|text|Swift+4|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|614850|@IBOutlet+weak+var+gButton:+UIButton!

override+func+viewDidLoad()+{

++++super.viewDidLoad()

++++let+topGradientColor+=+UIColor.red
++++let+bottomGradientColor+=+UIColor.yellow

++++let+gradientLayer+=+CAGradientLayer()

++++gradientLayer.frame+=+gButton.bounds

++++gradientLayer.colors+=+[topGradientColor.cgColor,+bottomGradientColor.cgColor]

++++//Vertical
++++//gradientLayer.startPoint+=+CGPoint(x:+0.0,+y:+0.0)
++++//gradientLayer.endPoint+=+CGPoint(x:+0.0,+y:+1.0)

++++//Horizontal
++++gradientLayer.startPoint+=+CGPoint(x:+0.0,+y:+0.0)
++++gradientLayer.endPoint+=+CGPoint(x:+1.0,+y:+0.0)

++++gButton.layer.insertSublayer(gradientLayer,+at:+0)
}|code-block|syntax|javascript|614851|entityMap^0|0|7|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Swift 4

<pre><code>@IBOutlet weak var gButton: UIButton!

override func viewDidLoad() {

 super.viewDidLoad()

 let topGradientColor = UIColor.red
 let bottomGradientColor = UIColor.yellow

 let gradientLayer = CAGradientLayer()

 gradientLayer.frame = gButton.bounds

 gradientLayer.colors = [topGradientColor.cgColor, bottomGradientColor.cgColor]

 //Vertical
 //gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.0)
 //gradientLayer.endPoint = CGPoint(x: 0.0, y: 1.0)

 //Horizontal
 gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.0)
 gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.0)

 gButton.layer.insertSublayer(gradientLayer, at: 0)
}
</code></pre>

I'm working on creating fancy looking UIbuttons by adding linear gradient to the button. However I'm not sure at which index I need to add the gradient. The code that I have currently places the gradient over the image/text.

How can I insert a sublayer to a UIButton under the text/image sublayer? It is important for me to keep the text and the image of a button visible!

<pre><code>+(void)addLinearGradientToView:(UIView*)view TopColor:(UIColor*)topColor BottomColor:(UIColor*)bottomColor
{
 for(CALayer* layer in view.layer.sublayers)
 {
 if ([layer isKindOfClass:[CAGradientLayer class]])
 {
 [layer removeFromSuperlayer];
 }
 }
 CAGradientLayer* gradientLayer = [CAGradientLayer layer];

 gradientLayer.startPoint = CGPointMake(0.5, 0);
 gradientLayer.endPoint = CGPointMake(0.5,1);
 gradientLayer.frame = view.bounds;
 gradientLayer.colors = [NSArray arrayWithObjects:(id)[topColor CGColor], (id)[bottomColor CGColor], nil];
 // [view.layer addSublayer:gradientLayer];
 if(view.layer.sublayers.count&gt;0)
 {
 [view.layer insertSublayer:gradientLayer atIndex:view.layer.sublayers.count-2];
 }else {
 [view.layer addSublayer:gradientLayer];
 }
}
</code></pre>

iPhone iOS how to add linear gradient to a UIButton under the button's text or image?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在通过在按钮中添加线性梯度来创建外观美观的UIbuttons。但是，我不确定我需要在哪个索引上添加梯度。当前将渐变设置在图像/文本上的代码。如何将子层插入到文本/图像子层下的UIButton中？对我来说很重要，使按钮的文本和图像可见！+(void)addLinearGradientToView:(UIView*)v...

问iPhone iOS如何在按钮的文本或图像下向UIButton添加线性梯度？
EN

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问iPhone iOS如何在按钮的文本或图像下向UIButton添加线性梯度？EN