触摸时自定义UIButton不突出显示

Question

我有一个创建自定义UIButton的方法,允许我使用QuartzCore更改按钮的颜色.但触摸时按钮不会突出显示.

- (UIButton *)makeHeaderButton {
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    UIFont *textFont = [UIFont boldSystemFontOfSize:12];
    UIColor *textColor = [UIColor colorWithRed:80/255.0 green:109/255.0 blue:145/255.0 alpha:1.0];
    UIColor *backgroundColor = [UIColor colorWithRed:250/255.0 green:250/255.0 blue:250/255.0 alpha:1.0];
    [button setTitleColor:textColor forState:UIControlStateNormal];
    button.titleLabel.font = textFont;
    button.autoresizesSubviews = YES;
    button.layer.cornerRadius = 8;
    button.layer.borderWidth = 1;
    // next 2 properties set using QuartzCore class, no other way to set button colors
    button.layer.borderColor = [UIColor grayColor].CGColor;
    button.layer.backgroundColor = backgroundColor.CGColor;
    button.clipsToBounds = YES;
    return button;
}

如何使这些按钮突出显示为常规圆形矩形按钮？

Answer 1

在Swift中,您还可以覆盖isHighlightedvar并在其上添加alpha动画.

override var isHighlighted: Bool {
    didSet {
        UIView.animate(withDuration: 0.25, delay: 0, options: [.beginFromCurrentState, .allowUserInteraction], animations: {
            self.alpha = self.isHighlighted ? 0.5 : 1
        }, completion: nil)
    }
}

Answer 2

在您的代码中,添加该行 button.showsTouchWhenHighlighted = TRUE;

Answer 3

对于Swift，创建一个继承UIButton并覆盖isHighlighted属性的自定义类：

class ButtonWithHighlight: UIButton {

    override var isHighlighted: Bool {
        get {
            return super.isHighlighted
        }
        set {
            if newValue {
                backgroundColor = <#color when highlighted#>
            }
            else {
                backgroundColor = <#color for normal state#>
            }
            super.isHighlighted = newValue
        }
    }

}

Answer 4

如果有人仍遇到问题 - 您应该像这样创建UIButton:

UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];

btn.layer.cornerRadius = 4;
btn.layer.masksToBounds = YES;

[btn setTranslatesAutoresizingMaskIntoConstraints:NO];

[btn setBackgroundColor:[UIColor greenColor]];
[btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

[btn setTitle:@"ok" forState:UIControlStateNormal];

*** any customisation that you would like ***

[parentView addSubview: btn];

所以这样你仍然可以让iOS处理所有突出显示.主要是使用

[UIButton buttonWithType:UIButtonTypeSystem];

如果您使用initWithFrame或任何其他方法 - 您必须实现

setTitleColor: forState: 
setBackgroundImage: forState: