Demo地址

主要代碼

1、遍歷所有扇形的比例,計(jì)算出每個(gè)扇形區(qū)域的開始和結(jié)束角度,然后繪制FanShapeLayer

int max = 0;
    for (NSNumber * obj in self.angles) {
        max += [obj intValue];
    }
    
    CGFloat startAngle = self.startAngle;// 起點(diǎn) 0 代表x軸正方向
    
    for (int i = 0; i < self.angles.count; i ++) {
        NSNumber * obj = [self.angles objectAtIndex:i];
        
        CGFloat rate = [obj intValue];
        CGFloat angle = rate / max * M_PI * 2.0;
        
        // 計(jì)算繪制角度-終點(diǎn) 繪制的角度 繪制的方向是逆時(shí)針的所以是減
        CGFloat endAngle = startAngle - angle;
        
        // 設(shè)置顏色
        UIColor * color = randomColor;
        
        // 創(chuàng)建FanShapeLayer
        FanShapeLayer * layer = [[FanShapeLayer alloc]init];
        layer.fillColor = color.CGColor;
        layer.name = [NSString stringWithFormat:@"圖層 = %d",i];
        layer.startAngle = startAngle;
        layer.endAngle = endAngle;
        layer.radius = self.radius;
        layer.centerPoint = self.chartPoint;
        // 繪制路徑(先設(shè)置參數(shù))
        [layer drawPath];
        [self.layer addSublayer:layer];
        [self.fansArray addObject:layer];
        
        // 計(jì)算下一次繪制起點(diǎn)
        startAngle -= angle;
    }

2稠歉、在設(shè)置FanShapeLayer的參數(shù)后,先繪制CGMutablePathRef即一個(gè)封閉的扇形,然后把CGMutablePathRef賦給FanShapeLayer

CGMutablePathRef path = CGPathCreateMutable();
    CGAffineTransform transform = CGAffineTransformMakeTranslation(1, 1);
    CGPathMoveToPoint(path, &transform, self.centerPoint.x, self.centerPoint.y);
    CGPathAddArc(path, &transform, self.centerPoint.x, self.centerPoint.y, radius, self.startAngle, self.endAngle, YES);
    CGPathCloseSubpath(path);

3檀轨、主要是點(diǎn)擊放大,CALyer是不響應(yīng)點(diǎn)擊事件的,這里是通過獲得觸摸對象的點(diǎn)是否在layer區(qū)域內(nèi)實(shí)現(xiàn)的花鹅。

網(wǎng)上查到可以通過下面方法獲得點(diǎn)擊的圖層,但這里得到的是nil,不知道為什么着撩。
CALayer * layer = [self.layer hitTest:point];

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    // 獲取點(diǎn)擊的中心點(diǎn)
    UITouch * touch = [touches anyObject];
    CGPoint point = [touch locationInView:self];
    // 獲取點(diǎn)擊區(qū)域 是否包含的CAShapeLayer
    FanShapeLayer * layer = [self touchLayer:point];
    if (layer) {
        NSLog(@"%@", layer.name);
        // 設(shè)置選中的為未選中
        NSPredicate * predicate = [NSPredicate predicateWithFormat:@"isSelected = YES"];
        NSArray * selectArray = [self.fansArray filteredArrayUsingPredicate:predicate];
        [selectArray makeObjectsPerformSelector:@selector(setIsSelected:) withObject:@NO];
        if ([selectArray containsObject:layer]) {
            return ;
        }
        // 添加動(dòng)畫
        layer.isSelected = YES;
    }
}

- (FanShapeLayer *)touchLayer:(CGPoint)point{
    // 獲取點(diǎn)擊的區(qū)域layer
    for (FanShapeLayer * layer in self.fansArray) {
        // 獲取inPoint夜矗，在layer中的坐標(biāo)
        CGPoint inPoint = [layer convertPoint:point fromLayer:self.layer];
        
        if (CGPathContainsPoint(layer.path, 0, inPoint, YES)) {
            return layer;
        }
    }
    return nil;
}

4点骑、最后在點(diǎn)擊的時(shí)候添加縮放動(dòng)畫

  // 添加動(dòng)畫
        CABasicAnimation *animation = [CABasicAnimation animation];
        // keyPath內(nèi)容是對象的哪個(gè)屬性需要?jiǎng)赢?        animation.keyPath = @"path";
        // 設(shè)置代理
        animation.delegate = self;
        // 所改變屬性的結(jié)束時(shí)的值
        animation.toValue = (__bridge id _Nullable)(self.endPath);
        // 動(dòng)畫時(shí)長
        animation.duration = 0.25;
        // 結(jié)束后不移除
        animation.removedOnCompletion = NO;
        animation.fillMode = kCAFillModeForwards;
        // 添加動(dòng)畫
        [self addAnimation:animation forKey:nil];