1. 自定义UICollectionLayout —- 正三角形居中布局
支持多个图形的自动布局
2. 自定义UICollectionLayout —- 正方形居中布局
滚动展示的区域
3. 自定义UICollectionLayout —- 正六边形居中布局(蜂窝布局)
等等正n变形布局，其中 正六边形支持 间距大小的改变，图形的旋转。
旋转 —
间距
4. 核心代码 —- 绘制正n边形 （贝塞尔曲线）
- (void)layoutSubviews{ [super layoutSubviews]; // step 1: 绘制正n变形 CGFloat X = self.contentView.frame.size.width * 0.5; CGFloat Y = self.contentView.frame.size.height * 0.5; UIBezierPath* bezierPath = [UIBezierPath bezierPath]; bezierPath.lineCapStyle = kCGLineCapRound; bezierPath.lineJoinStyle = kCGLineCapRound; CGFloat angle = labs(360/self.number); [bezierPath moveToPoint: CGPointMake(X - mm , Y)]; for (int i = 0; i < self.number - 1; i ++) { CGFloat angle1 = angle *(i + 1); CGFloat XX = X + (mm * (COS(angle1)))*(-1); CGFloat YY = Y + mm * (SIN(angle1)); [bezierPath addLineToPoint: CGPointMake(XX, YY)]; } [bezierPath addLineToPoint: CGPointMake(X - mm , Y)]; // step 2: 根据路径生成蒙板 CAShapeLayer *maskLayer = [CAShapeLayer layer]; maskLayer.path = [bezierPath CGPath]; self.backgroundColor = [UIColor redColor]; // step 3: 给cell添加模版 self.layer.mask = maskLayer; self.titleLabel.frame = self.bounds;}
5. 核心代码 — 自定义Layout布局
- (void)prepareLayout{ [super prepareLayout]; _itemCount = [self.collectionView numberOfItemsInSection:]; _attributeAttay = [[NSMutableArray alloc]init]; ; i < _itemCount; i ++) { //设置第一个正六边形的中心位置 CGFloat X = self.collectionView.frame.size.width*0.5; CGFloat Y = self.TopMargin; == ? -:i%; == ? :i%; X += CST(-num)*([self judgeXWithNumber:self.number]); Y += ([self judgeSizeWithNumber:self.number].height + self.margin)*(i/) + CST(num2)*([self judgeSizeWithNumber:self.number].height/)+self.margin; UICollectionViewLayoutAttributes *attribute = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:[NSIndexPath indexPathForRow:i inSection:]]; // 设置每隔item的大小 attribute.size = [self judgeSizeWithNumber:self.number]; // 设置每隔item的圆心 // 计算每个item的中心坐标 attribute.center = CGPointMake(X, Y); [_attributeAttay addObject:attribute]; }}// X轴方向的间隔- (CGFloat)judgeXWithNumber:(NSInteger)xNumber{ ) { /xNumber)*mm; } ) { /xNumber)*mm; } ) { /xNumber)*mm - ; } ) { /xNumber)*mm; } ) { /xNumber)*mm; } else { *mm + self.margin ; }}// 就算正n变形的大小- (CGSize)judgeSizeWithNumber:(NSInteger)sNumber{ || sNumber == ) { *mm,*SIN(/sNumber)*mm); } else { *(mm),*mm); }}//设置内容区域的大小-(CGSize)collectionViewContentSize{ CGFloat hh = [self judgeSizeWithNumber:self.number].height; CGFloat height = (hh+self.margin)*(self.itemCount/ + ) + self.TopMargin + ; if (height > Device_height) { height = height; } else { height = Device_height; } return CGSizeMake(Device_width, height);}//返回设置数组-(NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect{ return _attributeAttay;}
View Layout
