I noticed that when I place a white or black UIImage into a UISegmentedControl it automatically color masks it to match the tint of the segmented control. I thought this was really cool, and was wondering if I could do this elsewhere as well. For example, I have a bunch of buttons that have a uniform shape but varied colors. Instead of making a PNG for each button, could I somehow use this color masking to use the same image for all of them but then set a tint color or something to change their actual color?
当前回答
如果你在ios15之后到达这里,你使用的是新的UIButton。配置api,那么您可能需要通过imageColorTransformer来实现。
看起来是这样的:
configuration.imageColorTransformer = UIConfigurationColorTransformer { _ in .green }
为了方便,你可以创建一个扩展:
extension UIButton.Configuration {
func imageColor(_ color: UIColor) -> UIButton.Configuration {
var configuration = self
configuration.imageColorTransformer = UIConfigurationColorTransformer { _ in color }
return configuration
}
}
// Usage:
configuration = configuration.imageColor(.green)
与其他答案一样,图像本身必须在Xcode资产中“渲染为模板图像”,或者在code image. withrenderingmode (.alwaysTemplate)中
小贴士: 如果您想在按钮高亮显示时改变图像颜色,该怎么办?然后你的配置扩展看起来像这样:
func imageColor(whenNormal: UIColor,
whenHighlighted: UIColor,
isHighlighted: Bool) -> UIButton.Configuration {
var configuration = self
configuration.imageColorTransformer = UIConfigurationColorTransformer { _ in
isHighlighted ? whenHighlighted : whenNormal
}
return configuration
}
这个本身必须从configurationUpdateHandler上下文中调用,就像这样:
someButton.configurationUpdateHandler = { button in
guard var configuration = button.configuration else { return }
configuration.image = UIImage(named: "some_image")
configuration = configuration.imageColor(whenNormal: .green,
whenHighlighted: .green.withAlphaComponent(0.7),
isHighlighted: button.isHighlighted)
button.configuration = configuration
}
注意,您还可以在configurationUpdateHandler中根据按钮状态定义不同的映像。
其他回答
自定义按钮以各自的图像颜色显示。在故事板中将按钮类型设置为“System”(或者在代码中设置为UIButtonTypeSystem),将以默认的色调呈现按钮的图像。
(在iOS9, Xcode 7.3上测试)
我有一个问题,掩蔽图像在突出显示的状态。我不希望发生这种事。如果你有同样的问题,看看这个:adjustsImageWhenHighlighted = false
斯威夫特3:
如果你已经通过xCode界面构建器设置了你的图像,这个解决方案可能会很舒服。基本上你有一个扩展来着色图像:
extension UIImage {
public func image(withTintColor color: UIColor) -> UIImage{
UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
let context: CGContext = UIGraphicsGetCurrentContext()!
context.translateBy(x: 0, y: self.size.height)
context.scaleBy(x: 1.0, y: -1.0)
context.setBlendMode(CGBlendMode.normal)
let rect: CGRect = CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height)
context.clip(to: rect, mask: self.cgImage!)
color.setFill()
context.fill(rect)
let newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return newImage
}
}
然后,你可以准备这个UIButton扩展为特定状态的图像上色:
extension UIButton {
func imageWith(color:UIColor, for: UIControlState) {
if let imageForState = self.image(for: state) {
self.image(for: .normal)?.withRenderingMode(.alwaysTemplate)
let colorizedImage = imageForState.image(withTintColor: color)
self.setImage(colorizedImage, for: state)
}
}
}
用法:
myButton.imageWith(.red, for: .normal)
P.S.(在表格单元格中工作也很好,你不需要调用setNeedDisplay()方法,由于UIImage扩展,颜色的变化是立即的。
你应该试试
设置好框架后
NSArray *arr10 =[NSArray arrayWithObjects:btn1,btn2,nil];
for(UIButton *btn10 in arr10)
{
CAGradientLayer *btnGradient2 = [CAGradientLayer layer];
btnGradient2.frame = btn10.bounds;
btnGradient2.colors = [NSArray arrayWithObjects:
(id)[[UIColor colorWithRed:151.0/255.0f green:206.0/255.5 blue:99.0/255.0 alpha:1] CGColor],
(id)[[UIColor colorWithRed:126.0/255.0f green:192.0/255.5 blue:65.0/255.0 alpha:1]CGColor],
nil];
[btn10.layer insertSublayer:btnGradient2 atIndex:0];
}
为了在按钮上设置白色的图像(箭头图标),我们使用:
let imageOnButton = UIImage(named: "navForwardArrow")?.imageWithColor(color: UIColor.white)
button.setImage(imageOnButton, for: .normal)
已知问题:当按下按钮时,图标会失去白色。
截图:
推荐文章
- 我如何在我的iOS应用程序中每n分钟得到一个后台位置更新?
- 如何使用iOS创建GUID/UUID
- 禁用所呈现视图控制器的交互式撤销
- 点击按钮时如何打开手机设置?
- 如何使用UIVisualEffectView来模糊图像?
- 如何修复UITableView分隔符在iOS 7?
- 故事板中的自定义单元格行高设置没有响应
- 在Swift中使用自定义消息抛出错误/异常的最简单方法?
- 如何在Swift中获得唯一的设备ID ?
- 复制文本到剪贴板与iOS
- 在Swift中根据字符串计算UILabel的大小
- 如何调用手势点击在UIView编程在迅速
- 我如何隐藏在一个Swift iOS应用程序的状态栏?
- 在iPad上使用iOS 8正确呈现UIAlertController
- 尝试将一个非属性列表对象设置为NSUserDefaults