前言

APP做得好不在于一些細(xì)節(jié)的處理，用戶可以看得到珍促，但是也最容易忽略校镐，我們要提升體驗(yàn)垦细，但是用戶又感覺不到。這篇文章主要處理播放按鈕的動(dòng)畫压恒，以及runtime中Method Swizzling 使用影暴；
我們先來看看效果：

效果

效果很細(xì)微，不容易被用戶察覺探赫，所以長期看也不會(huì)覺得厭煩型宙。

實(shí)現(xiàn)

初始化

按鈕很簡單，我們直接用CAShapeLayer畫出來期吓，因?yàn)?code>CAShapeLayer有強(qiáng)大的path屬性所以我選著它
按鈕在暫停的時(shí)候有三條線段早歇，播放的時(shí)候兩條線段。我直接初始化三條線段讨勤；

線段

動(dòng)畫

動(dòng)畫還是直接調(diào)用path屬性

/**
 path動(dòng)畫

 @param path 變?yōu)榈膒ath
 @param duration 持續(xù)時(shí)間
 @return 返回動(dòng)畫
 */
- (CABasicAnimation*)animationToPath:(UIBezierPath* )path duration:(NSTimeInterval)duration {
    CABasicAnimation    *pathAnimation   = [CABasicAnimation animationWithKeyPath:@"path"];
    pathAnimation.toValue                = (__bridge id)(path.CGPath);
    pathAnimation.fillMode               = kCAFillModeForwards;
    pathAnimation.removedOnCompletion    = NO;
    pathAnimation.duration               = duration;
    return pathAnimation;
}

layer3的時(shí)候會(huì)有出現(xiàn)和消失，這里會(huì)做一個(gè)不透明度的動(dòng)畫

/**
 不透明度動(dòng)畫
 
 @param layer 要執(zhí)行動(dòng)畫的layer
 @param from 從多少開始
 @param to 到多少
 */
- (void)opacityAnimationWithLayer:(CALayer*)layer fromValue:(CGFloat)from toValue:(CGFloat)to {
    CABasicAnimation *opacityAnimation           = [CABasicAnimation animationWithKeyPath:@"opacity"];
    opacityAnimation.toValue                     = @(to);
    opacityAnimation.fromValue                   = @(from);
    opacityAnimation.duration                    = .2;
    opacityAnimation.fillMode                    = kCAFillModeForwards;
    opacityAnimation.removedOnCompletion         = NO;
    [layer addAnimation:opacityAnimation forKey:nil];
}

動(dòng)畫很簡單接下來是替換系統(tǒng)方法

+(void)load {

    SEL actionA   = @selector(sendAction:to:forEvent:);
    SEL actionB   = @selector(__ai__sendAction:to:forEvent:);
    //原有的方法
    Method aMetod =   class_getInstanceMethod([AIPlayerButton class],actionA);
    //自定義的方法
    Method bMetod = class_getInstanceMethod([AIPlayerButton class], actionB);
    //這句是為了保護(hù)系統(tǒng)的方法
    BOOL isAdd = class_addMethod([AIPlayerButton class], actionA, method_getImplementation(bMetod), method_getTypeEncoding(bMetod));
    if (isAdd) {
        class_replaceMethod([AIPlayerButton class], actionB, method_getImplementation(aMetod), method_getTypeEncoding(aMetod));
    }else{
        method_exchangeImplementations(aMetod, bMetod);
    }
}
- (void)__ai__sendAction:(SEL)action to:(nullable id)target forEvent:(nullable UIEvent *)event {
    if (self.ignoreEvent) {
        return;
    }
    if (self.acceptEventInterval > 0) {
        self.ignoreEvent  = YES;
        [self performSelector:@selector(setIgnoreEvent:) withObject:@(NO) afterDelay:self.acceptEventInterval];
        if (self.isSelected) {
            [self changeToPlayingAnimation];
        } else {
            [self changeToStopAnimation];
        }
        [self __ai__sendAction:action to:target forEvent:event];
    }
}

對(duì)于可以看OC Method Swizzling 使用
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