iPhone iOS如何在按钮的文本或图像下向UIButton添加线性梯度？
iPhone iOS如何在按钮的文本或图像下向UIButton添加线性梯度？
提问于 2012-05-14 14:15:44
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*)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>0)
{
[view.layer insertSublayer:gradientLayer atIndex:view.layer.sublayers.count-2];
}else {
[view.layer addSublayer:gradientLayer];
}
}回答 4
Stack Overflow用户
回答已采纳
发布于 2012-05-14 16:59:16
将其添加到自定义按钮的层：
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];其中customButton是您的自定义UIButton。
Stack Overflow用户
发布于 2012-05-14 16:46:36
对于要达到的目标，请始终在索引0处插入。
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。
Stack Overflow用户
发布于 2019-01-17 05:05:44
Swift 4
@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)
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/10585103
复制相关文章
相似问题
腾讯云开发者
