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
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];
}
其他回答
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:
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。
如果你有一个带有背景图像的自定义按钮。您可以设置您的按钮的色调颜色和覆盖以下图像。
在资产中选择你想设置色调的按钮背景。
在图像的属性检查器中设置渲染值为“Template image”
现在当你setbutton时。tintColor = UIColor。红色“您”按钮将以红色显示。
let button = UIButton(type: .custom)
let image = UIImage(named: "image_name")?.withRenderingMode(.alwaysTemplate)
button.setImage(image, for: .normal)
button.tintColor = UIColor.red
如果你在设置UIButton。tintColor by UIColor(r:g:b:alpha:),记住值除以255。这些RGB值应该在0和1之间。
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