uibarbuttonitem高亮色調/顏色

Question

當我們選擇它時，我們是否可以更改uibarbuttonitem的顏色/色調並突出顯示？我正在創建的應用程序將經常使用外部門，並希望在高眩光情況下它更明顯，讓用戶知道他實際上按下了按鈕。

編輯：我想改變顏色的按鈕的高亮顯示狀態

Answer 1

我沒有試過，但你可以嘗試繼承UIBarButtonItem，然後重寫touchesEnded:withEvent:和touchesBegan:withEvent:方法，然後使用它們來設置tintColor爲您的UIBarButtonItem實例。

你會添加到您的UIBarButtonItem子類：

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

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

Answer 2

一個UIButton是UIControl的子類，它有一個adjustsImageWhenHighlighted，一個showsTouchWhenHighlighted和showsTouchWhenHighlighted財產。

UIBarButtonItem是UIBarItem的子類，沒有這些。它確實有一個UIBarButtonItemStyle，當它被設置爲UIBarButtonItemStylePlain時，它表示點擊時按鈕發光（但不能指定顏色）。

Answer 3

您可以繼承UIBarButtonItem並將UIButton放入其中，並使用不同背景圖像顏色的不同狀態。

- (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; 

} 

你需要把這個變成UIImage的類別：

- (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; 

}