uibarbuttonitem高亮显示tint/color

Question

当uibarbuttonitem被选中并突出显示时，我们可以更改它的颜色/色调吗？我正在创建的应用程序将经常在户外使用，并希望它在高眩光情况下更明显，让用户知道他实际上按下了按钮。

编辑:我想要更改按钮突出显示状态的颜色

Answer 1

我还没有尝试过这样做，但是您可以尝试将UIBarButtonItem子类化，然后覆盖touchesEnded:withEvent:和touchesBegan:withEvent:方法，然后使用它们来设置UIBarButtonItem实例的tintColor。

您可以将以下代码添加到UIBarButtonItem子类中：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    self.tintColor = [UIColor redColor];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    self.tintColor = [UIColor blueColor];
}

Answer 2

你可以创建UIBarButtonItem的子类，并将UIButton放入其中，为不同的状态提供不同的背景图像颜色。

- (id)initWithImage:(UIImage *)image target:(id)target action:(SEL)action
{

    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = (CGRect){CGPointZero, image.size};

    [button setBackgroundImage:image forState:UIControlStateNormal];

    UIImage *highlightedImage = [image imageWithColor:[UIColor textHighlightColor]];
    [button setBackgroundImage:highlightedImage forState:UIControlStateHighlighted];
    [button setBackgroundImage:highlightedImage forState:UIControlStateSelected];

    [button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];

    self = [self initWithCustomView:button];

    return self;

}

您需要将其放入UIImage类别中：

- (UIImage *)imageWithColor:(UIColor *)color
{

    // begin a new image context, to draw our colored image onto
    UIGraphicsBeginImageContext(self.size);

    // get a reference to that context we created
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, color.CGColor);

    // translate/flip the graphics context (for transforming from CG* coords to UI* coords
    CGContextTranslateCTM(context, 0, self.size.height);
    CGContextScaleCTM(context, 1.0, -1.0);

    // set the blend mode to color burn, and the original image
    CGContextSetBlendMode(context, kCGBlendModeMultiply);
    CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
    CGContextDrawImage(context, rect, self.CGImage);

    // set a mask that matches the shape of the image, then draw (color burn) a colored rectangle
    CGContextClipToMask(context, rect, self.CGImage);
    CGContextAddRect(context, rect);
    CGContextDrawPath(context,kCGPathFill);

    // generate a new UIImage from the graphics context we drew onto
    UIImage *coloredImg = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    //return the color-burned image

    return coloredImg;

}

Answer 3

UIButton是UIControl的子类，它具有adjustsImageWhenHighlighted、showsTouchWhenHighlighted和showsTouchWhenHighlighted属性。

UIBarButtonItem是UIBarItem的子类，并且没有这些。但是，它确实有一个UIBarButtonItemStyle，当设置为UIBarButtonItemStylePlain时，表示按钮在被点击时会发光(但你不能指定颜色)。