Xamarin的。iOS (c#):

UIButton messagesButton = new UIButton(UIButtonType.Custom);
UIImage icon = UIImage.FromBundle("Images/icon.png");
messagesButton.SetImage(icon.ImageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate), UIControlState.Normal);
messagesButton.TintColor = UIColor.White;
messagesButton.Frame = new RectangleF(0, 0, 25, 25);

Swift 4与customType:

let button = UIButton(frame: aRectHere)
    let buttonImage = UIImage(named: "imageName")
    button.setImage(buttonImage?.withRenderingMode(.alwaysTemplate), for: .normal)
    button.tintColor = .white

正如Ric已经在他的帖子中提到的，你可以在代码中设置渲染模式，你也可以直接在图像目录中这样做，见下面所附的图像。只需要设置渲染为模板图像

注意，我在使用iOS 7和这种方法时遇到过问题。如果你也使用iOS 7，你可能也想在代码中完成，就像这里描述的。

以上都不适合我，因为点击后色调被清除。我必须使用

button.setImageTintColor(Palette.darkGray(), for: UIControlState())

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];

}