前言

一直觉得qq的红点动画比较叼,今天研究了一下,主要是绘制不规则图形和左右晃动动画,希望可以帮到你们.

王姐威武霸气.jpg

一下是效果展示

2BDEF402-CC52-4704-A218-4C6FE648AA9F.png CD8E492F-6EC8-4F7A-9FCF-202F6E834304.png

废话不多说上代码

#pragma mark - 用于计算不规则路径
- (UIBezierPath *)pathWithBigCirCleView:(UIView *)bigCirCleView  smallCirCleView:(UIView *)smallCirCleView
{
    CGPoint bigCenter = bigCirCleView.center;
    CGFloat x2 = bigCenter.x;
    CGFloat y2 = bigCenter.y;
    CGFloat r2 = bigCirCleView.bounds.size.width / 2;
    
    CGPoint smallCenter = smallCirCleView.center;
    CGFloat x1 = smallCenter.x;
    CGFloat y1 = smallCenter.y;
    CGFloat r1 = smallCirCleView.bounds.size.width / 2;
    
    // 获取圆心距离
    CGFloat d = [self pointToPoitnDistanceWithPoint:self.samllCircleView.center potintB:self.center];
    CGFloat sinθ = (x2 - x1) / d;
    CGFloat cosθ = (y2 - y1) / d;
    
    // 坐标系基于父控件
    CGPoint pointA = CGPointMake(x1 - r1 * cosθ , y1 + r1 * sinθ);
    CGPoint pointB = CGPointMake(x1 + r1 * cosθ , y1 - r1 * sinθ);
    CGPoint pointC = CGPointMake(x2 + r2 * cosθ , y2 - r2 * sinθ);
    CGPoint pointD = CGPointMake(x2 - r2 * cosθ , y2 + r2 * sinθ);
    CGPoint pointO = CGPointMake(pointA.x + d / 2 * sinθ , pointA.y + d / 2 * cosθ);
    CGPoint pointP = CGPointMake(pointB.x + d / 2 * sinθ , pointB.y + d / 2 * cosθ);
    
    UIBezierPath *path = [UIBezierPath bezierPath];
    // A
    [path moveToPoint:pointA];
    // AB
    [path addLineToPoint:pointB];
    // 绘制BC曲线
    [path addQuadCurveToPoint:pointC controlPoint:pointP];
    // CD
    [path addLineToPoint:pointD];
    // 绘制DA曲线
    [path addQuadCurveToPoint:pointA controlPoint:pointO];
    
    return path;
}

Demo下载地址:https://github.com/yuhechuan/UITabBar-qqDemo