为 UIButton 添加发光效果 - iOS

Question

我有一个 UIButton，它是一个徽标。此徽标按钮将永远发光，但在触摸时会停止发光。它就像一个发光的动画。

有什么建议吗？

  Undefined symbols for architecture i386:
 "_OBJC_CLASS_$_CABasicAnimation", referenced from:
 objc-class-ref in UIView+Glow.o
 "_OBJC_CLASS_$_CAMediaTimingFunction", referenced from:
  objc-class-ref in UIView+Glow.o
  "_kCAMediaTimingFunctionEaseInEaseOut", referenced from:
  -[UIView(Glow) startGlowing] in UIView+Glow.o
   ld: symbol(s) not found for architecture i386
   clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

我喜欢我的“额外特殊”按钮的这种发光 + 增长/收缩动画：

-(void)makeViewShine:(UIView*) view
{
view.layer.shadowColor = [UIColor yellowColor].CGColor;
view.layer.shadowRadius = 10.0f;
view.layer.shadowOpacity = 1.0f;
view.layer.shadowOffset = CGSizeZero;


[UIView animateWithDuration:0.7f delay:0 options:UIViewAnimationOptionAutoreverse | UIViewAnimationCurveEaseInOut | UIViewAnimationOptionRepeat | UIViewAnimationOptionAllowUserInteraction  animations:^{

    [UIView setAnimationRepeatCount:15];

    view.transform = CGAffineTransformMakeScale(1.2f, 1.2f);


} completion:^(BOOL finished) {

    view.layer.shadowRadius = 0.0f;
    view.transform = CGAffineTransformMakeScale(1.0f, 1.0f);
}];

}

Answer 2

我建议你使用Glow Category of UIView made by secret lab。

示例可用here

Answer 3

斯威夫特 5

1. 使用动画创建 UIView 扩展

2. 在文本字段、按钮、视图（UIView 的任何子类）上使用它

注意：您可以更改值并尝试获得所需的效果。

UIView 扩展

import UIKit

extension UIView {
    enum GlowEffect: Float {
        case small = 0.4, normal = 2, big = 15
    }

    func doGlowAnimation(withColor color: UIColor, withEffect effect: GlowEffect = .normal) {
        layer.masksToBounds = false
        layer.shadowColor = color.cgColor
        layer.shadowRadius = 0
        layer.shadowOpacity = 1
        layer.shadowOffset = .zero

        let glowAnimation = CABasicAnimation(keyPath: "shadowRadius")
        glowAnimation.fromValue = 0
        glowAnimation.toValue = effect.rawValue
        glowAnimation.beginTime = CACurrentMediaTime()+0.3
        glowAnimation.duration = CFTimeInterval(0.3)
        glowAnimation.fillMode = .removed
        glowAnimation.autoreverses = true
        glowAnimation.isRemovedOnCompletion = true
        layer.add(glowAnimation, forKey: "shadowGlowingAnimation")
    }
}

使用方法：

//TextField with border
textField.doGlowAnimation(withColor: UIColor.red, withEffect: .big)

//Label
label.doGlowAnimation(withColor: label.textColor, withEffect: .small)

//Button
button.doGlowAnimation(withColor: UIColor.red, withEffect: .big)

Answer 4

发光代码取自：Creating a Glow Effect for UILabel and UIButton

首先，您需要导入 QuartzCore 框架：

#import <QuartzCore/QuartzCore.h>

当您创建按钮时（或在viewDidLoad，取决于您的代码结构）添加 这段代码：

UIColor *color = button.currentTitleColor;
button.titleLabel.layer.shadowColor = [color CGColor];
button.titleLabel.layer.shadowRadius = 4.0f;
button.titleLabel.layer.shadowOpacity = .9;
button.titleLabel.layer.shadowOffset = CGSizeZero;
button.titleLabel.layer.masksToBounds = NO;

您需要注意两个事件：UIControlEventTouchDown 和 UIControlEventTouchUpInside

在UIControlEventTouchDown 处理程序中，您将添加代码：

UIColor *color = [UIColor clearColor];
button.titleLabel.layer.shadowColor = [color CGColor];

在UIControlEventUpInside 处理程序中，您将添加代码：

UIColor *color = button.currentTitleColor;
button.titleLabel.layer.shadowColor = [color CGColor];

同样，实现细节取决于您是通过编程方式还是通过 Interface Builder 创建按钮，但我相信您从这里开始就可以解决这个问题。

编辑：对于自定义按钮，只需添加以下代码即可：

[button setImage:[UIImage imageNamed:@"buttonWithGlow.png"]
        forState:UIControlStateNormal];
[button setImage:[UIImage imageNamed:@"buttonWithNoGlow.png"] 
        forState:UIControlStateHighlighted];

Answer 5

这是我的答案....

使用类别

/* ****FAQ?

 1.how to add glow effect on uibutton?
 [UIButton glowUIButton:playButton];

 2.how to remove effect on uibutton?
 [UIButton removeGlowUIButton:playButton];

 Ends*** */

#import <UIKit/UIKit.h>
@interface UIButton (BlinkEffect)
//blink effect category
+( void) glowUIButton:(UIButton *)inputButton;
//remove blink effect
+(void) removeGlowUIButton:(UIButton *)inputButton;
@end

#import "UIButton+BlinkEffect.h"

@implementation UIButton (BlinkEffect)

+(void) glowUIButton:(UIButton *)inputButton
{
    //add blink effect
    CALayer *viewLayer = inputButton.layer;
    viewLayer.shadowOffset = CGSizeMake(0,0);
    CGFloat radius = CGRectGetWidth(inputButton.bounds)/2.0;
    viewLayer.shadowColor = [[UIColor whiteColor] CGColor];
    viewLayer.shadowPath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(-7,-5.5, 2.5 * (radius), 2.5 * radius) cornerRadius:radius].CGPath;
    viewLayer.shadowRadius = 5.0f;
    viewLayer.shadowOpacity = 1.0f;

    //Let's animate it while we're at it.
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"shadowOpacity"];
    animation.duration =0.7;
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
    animation.fromValue = [NSNumber numberWithFloat:1.0];
    animation.toValue = [NSNumber numberWithFloat:0.0];
    animation.autoreverses = YES;
    animation.repeatCount = 1.0 / 0.0;
    [viewLayer addAnimation:animation forKey:@"shadowOpacity"];

}

+(void)removeGlowUIButton:(UIButton *)inputButton
{
    CALayer *viewLayer = inputButton.layer;
    viewLayer.shadowColor = [[UIColor clearColor] CGColor];
    [viewLayer removeAnimationForKey:@"shadowOpacity"];
}
@end

Answer 6

斯威夫特 5

alegelos 用 shadowOpacity、autorepeat 和 shadowOffset 回答：

extension UIView {

  enum GlowEffect: Float {
    case small = 0.4, normal = 5, big = 15
  }
  
  func doGlowAnimation(withColor color: UIColor, withEffect effect: GlowEffect = .normal) {
    layer.masksToBounds = false
    layer.shadowColor = color.cgColor
    layer.shadowRadius = 0
    layer.shadowOpacity = 1
    layer.shadowOffset = CGSize(width: 0, height: 3)
    
    let glowAnimationRadius = CABasicAnimation(keyPath: "shadowRadius")
    glowAnimationRadius.fromValue = 0
    glowAnimationRadius.toValue = effect.rawValue
    glowAnimationRadius.beginTime = CACurrentMediaTime()+0.3
    glowAnimationRadius.duration = CFTimeInterval(1.3)
    glowAnimationRadius.fillMode = .removed
    glowAnimationRadius.autoreverses = true
    glowAnimationRadius.repeatCount = .infinity
    layer.add(glowAnimationRadius, forKey: "shadowGlowingAnimationRadius")
    
    let glowAnimationOpacity = CABasicAnimation(keyPath: "shadowOpacity")
    glowAnimationOpacity.fromValue = 0
    glowAnimationOpacity.toValue = 1
    glowAnimationOpacity.beginTime = CACurrentMediaTime()+0.3
    glowAnimationOpacity.duration = CFTimeInterval(1.3)
    glowAnimationOpacity.fillMode = .removed
    glowAnimationOpacity.autoreverses = true
    glowAnimationOpacity.repeatCount = .infinity
    layer.add(glowAnimationOpacity, forKey: "shadowGlowingAnimationOpacity")
  }
}