uibarbuttonitem高亮色调/颜色

Question

当我们选择它时，我们是否可以更改uibarbuttonitem的颜色/色调并突出显示？我正在创建的应用程序将经常使用外部门，并希望在高眩光情况下它更明显，让用户知道他实际上按下了按钮。

编辑：我想改变颜色的按钮的高亮显示状态

Answer 1

我没有试过，但你可以尝试继承UIBarButtonItem，然后重写touchesEnded:withEvent:和touchesBegan:withEvent:方法，然后使用它们来设置tintColor为您的UIBarButtonItem实例。

你会添加到您的UIBarButtonItem子类：

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

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

Answer 2

一个UIButton是UIControl的子类，它有一个adjustsImageWhenHighlighted，一个showsTouchWhenHighlighted和showsTouchWhenHighlighted财产。

UIBarButtonItem是UIBarItem的子类，没有这些。它确实有一个UIBarButtonItemStyle，当它被设置为UIBarButtonItemStylePlain时，它表示点击时按钮发光（但不能指定颜色）。

Answer 3

您可以继承UIBarButtonItem并将UIButton放入其中，并使用不同背景图像颜色的不同状态。

- (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; 

} 

你需要把这个变成UIImage的类别：

- (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; 

}