在突出顯示時更改UIButton邊框顏色

Question

我有一個簡單的自定義UIButton，我添加了：

button.layer.bordercolor = [[UIColor blueColor]CGColor];

但是，我想在突出顯示按鈕時更改.bordercolor。 我嘗試在按鈕的touchDown動作中添加動作，將.bordercolor更改為紅色，但是當用戶抬起手指時，它會保持紅色而不是返回藍色。 有任何想法嗎？

Answer 1

你走在正確的軌道上。 檢查下面的代碼，它詳細說明了這一點，但您要做的是將選擇器鏈接到按鈕上的不同控件事件。 一個用於touchDown將陰影更改為紅色，另一個用於touchUpInside以在您抬起手指時更改陰影。

另外，我看到你已經在Stack Overflow上提出了幾個問題，並且尚未將其標記為正確的答案。 要繼續在本網站上獲得幫助，您需要開始標記問題的正確答案。

[myButton addTarget:self action:@selector(highlightBorder) forControlEvents:UIControlEventTouchDown];
[myButton addTarget:self action:@selector(unhighlightBorder) forControlEvents:UIControlEventTouchUpInside];


- (void)highlightBorder
{
    myButton.layer.borderColor = [[UIColor redColor]CGColor];
}

- (void)unhighlightBorder
{
    myButton.layer.borderColor = [[UIColor blueColor]CGColor];
    //additional code for an action when the button is released can go here.
}

注意： UIControlEvents 其他選項包括：

enum {
   UIControlEventTouchDown           = 1 <<  0,
   UIControlEventTouchDownRepeat     = 1 <<  1,
   UIControlEventTouchDragInside     = 1 <<  2,
   UIControlEventTouchDragOutside    = 1 <<  3,
   UIControlEventTouchDragEnter      = 1 <<  4,
   UIControlEventTouchDragExit       = 1 <<  5,
   UIControlEventTouchUpInside       = 1 <<  6,
   UIControlEventTouchUpOutside      = 1 <<  7,
   UIControlEventTouchCancel         = 1 <<  8,

   UIControlEventValueChanged        = 1 << 12,

   UIControlEventEditingDidBegin     = 1 << 16,
   UIControlEventEditingChanged      = 1 << 17,
   UIControlEventEditingDidEnd       = 1 << 18,
   UIControlEventEditingDidEndOnExit = 1 << 19,

   UIControlEventAllTouchEvents      = 0x00000FFF,
   UIControlEventAllEditingEvents    = 0x000F0000,
   UIControlEventApplicationReserved = 0x0F000000,
   UIControlEventSystemReserved      = 0xF0000000,
   UIControlEventAllEvents           = 0xFFFFFFFF
};

Answer 2

SWIFT 2.x回答您的問題：

➜使用“didSet”觀察者覆蓋突出顯示的屬性。

override var highlighted: Bool {
    didSet {

        switch highlighted {
        case true:
            layer.borderColor = UIColor.lightGrayColor().CGColor
        case false:
            layer.borderColor = UIColor.blackColor().CGColor
        }
    }
}

斯威夫特3：

override var isHighlighted: Bool {
    didSet {

        switch isHighlighted {
        case true:
            layer.borderColor = UIColor.lightGray.cgColor
        case false:
            layer.borderColor = UIColor.black.cgColor
        }
    }
}

Answer 3

您可以覆蓋UIButton子類中的setHighlighted和setSelected方法。 從那里你只需調整邊框顏色如下：

- (void)setHighlighted:(BOOL)highlighted {

    [super setHighlighted:highlighted];

    [self tweakState:highlighted];
}

- (void)setSelected:(BOOL)selected {

    [super setSelected:selected];

    [self tweakState:selected];
}

- (void)tweakState:(BOOL)state {

    if (state) {
        self.layer.borderColor = [_highlightedBorderColor CGColor];
    }
    else {
        self.layer.borderColor = [_defaultBorderColor CGColor];
    }
}

Answer 4

自包含解決方案：

static UIColor *BorderColor()
{
  return [UIColor grayColor];
}

static UIColor *HighlightedBorderColor()
{
  return [UIColor lightGrayColor];
}

@interface BorderedButton : UIButton

@end

@implementation BorderedButton

- (instancetype)initWithFrame:(CGRect)frame
{
  self = [super initWithFrame:frame];
  if (self) {
    self.layer.borderColor = BorderColor().CGColor;
    self.layer.cornerRadius = 4.0;
    self.layer.borderWidth = 1.0;
  }
  return self;
}

- (void)setHighlighted:(BOOL)highlighted
{
  [super setHighlighted:highlighted];
  self.layer.borderColor = (highlighted) ? HighlightedBorderColor().CGColor : BorderColor().CGColor;
}

@end

感謝@ josip-b！

Answer 5

對於不涉及子類化的解決方案，您始終可以向UIButton添加擴展方法。 例如

func setBackgroundColor(_ backgroundColor: UIColor,
                        borderColor: UIColor,
                        borderWidth: CGFloat,
                        cornerRadius: CGFloat,
                        forState state: UIControlState) {

    UIGraphicsBeginImageContext(bounds.size)
    guard let context = UIGraphicsGetCurrentContext() else { return }

    if borderWidth > 0 {
        layer.borderWidth = 0 // hide the layer's border if we're going to draw a border
    }

    context.addPath(UIBezierPath(roundedRect: bounds.insetBy(dx: borderWidth, dy: borderWidth), cornerRadius: cornerRadius).cgPath)
    context.setStrokeColor(borderColor.cgColor)
    context.setFillColor(backgroundColor.cgColor)
    context.setLineWidth(borderWidth)

    context.closePath()
    context.strokePath()
    context.fillPath()

    let buttonImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    setBackgroundImage(buttonImage, for: state)
}

Answer 6

斯威夫特4 ：

override var isHighlighted: Bool {
    didSet {
        layer.borderColor = isHighlighted ? UIColor.lightGray.cgColor : UIColor.black.cgColor
    }
}