183 lines
8.4 KiB
Objective-C
Executable File
183 lines
8.4 KiB
Objective-C
Executable File
//
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// UITableViewCell+CSCellShadows.m
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// CoinShang
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//
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// Created by Jiayu_iOSer on 2018/11/27.
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// Copyright © 2018 Shangbee. All rights reserved.
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//
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#import "UITableViewCell+CSCellShadows.h"
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@implementation UITableViewCell (CSCellShadows)
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- (void)addShadowToCellInTableView:(UITableView *)tableView
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atIndexPath:(NSIndexPath *)indexPath
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{
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// 给section加阴影
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BOOL isFirstRow = !indexPath.row;// 第一个cell
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BOOL isLastRow = (indexPath.row == [tableView numberOfRowsInSection:indexPath.section] - 1);//最后一个cell
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BOOL isSectionOneRow = ([tableView numberOfRowsInSection:indexPath.section] == 1);// 只有一个cell
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// the shadow rect determines the area in which the shadow gets drawn
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CGRect shadowRect = CGRectInset(CGRectMake(0, 0, ScreenWidth, self.frame.size.height), 10, -10);
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if(isFirstRow)
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shadowRect.origin.y += 10;
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else if(isLastRow)
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shadowRect.size.height -= 10;
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// the mask rect ensures that the shadow doesn't bleed into other table cells
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CGRect maskRect = CGRectInset(CGRectMake(0, 0, ScreenWidth, self.frame.size.height), -10, 0);
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if(isFirstRow) {
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maskRect.origin.y -= 10;
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maskRect.size.height += 10;
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}
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else if(isLastRow)
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maskRect.size.height += 10;
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// 如果section 只有一个cell
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if (isSectionOneRow) {
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for (int i = 0; i < 2; i++) {
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shadowRect.size.height -= 10;
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maskRect.size.height += 5;
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}
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}
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// now configure the background view layer with the shadow
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CALayer *layers = self.backgroundView.layer;
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layers.shadowColor = [UIColor lightGrayColor].CGColor;
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layers.shadowOffset = CGSizeMake(0, 0);
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layers.shadowRadius = 2.5;
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layers.shadowOpacity = 0.2f;
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layers.shadowPath = [UIBezierPath bezierPathWithRoundedRect:shadowRect cornerRadius:8].CGPath;
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layers.masksToBounds = NO;
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// and finally add the shadow mask
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CAShapeLayer *maskLayer = [CAShapeLayer layer];
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maskLayer.path = [UIBezierPath bezierPathWithRect:maskRect].CGPath;
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layers.mask = maskLayer;
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/*
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BOOL isFirstRow = !indexPath.row;
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BOOL isLastRow = (indexPath.row == [tableView numberOfRowsInSection:indexPath.section] - 1);
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// the shadow rect determines the area in which the shadow gets drawn
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CGRect shadowRect = CGRectInset(self.backgroundView.bounds, 0, -10);
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if(isFirstRow)
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shadowRect.origin.y += 10;
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else if(isLastRow)
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shadowRect.size.height -= 10;
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// the mask rect ensures that the shadow doesn't bleed into other table cells
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CGRect maskRect = CGRectInset(self.backgroundView.bounds, -20, 0);
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if(isFirstRow) {
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maskRect.origin.y -= 10;
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maskRect.size.height += 10;
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}
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else if(isLastRow)
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maskRect.size.height += 10;
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// now configure the background view layer with the shadow
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CALayer *layer = self.backgroundView.layer;
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layer.shadowColor = [UIColor redColor].CGColor;
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layer.shadowOffset = CGSizeMake(0, 0);
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layer.shadowRadius = 3;
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layer.shadowOpacity = 0.75;
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layer.shadowPath = [UIBezierPath bezierPathWithRoundedRect:shadowRect cornerRadius:5].CGPath;
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layer.masksToBounds = NO;
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// and finally add the shadow mask
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CAShapeLayer *maskLayer = [CAShapeLayer layer];
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maskLayer.path = [UIBezierPath bezierPathWithRect:maskRect].CGPath;
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layer.mask = maskLayer;
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*/
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}
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/*
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/ 给tableview section 添加圆角
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/
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*/
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- (void)addShadowToSectionTableView:(UITableView *)tableView
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atIndexPath:(NSIndexPath *)indexPath{
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// 圆角弧度半径
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CGFloat cornerRadius = 7.f;
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// 设置cell的背景色为透明，如果不设置这个的话，则原来的背景色不会被覆盖
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self.backgroundColor = UIColor.clearColor;
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// 创建一个shapeLayer
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CAShapeLayer *layer = [[CAShapeLayer alloc] init];
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CAShapeLayer *backgroundLayer = [[CAShapeLayer alloc] init]; //显示选中
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// 创建一个可变的图像Path句柄，该路径用于保存绘图信息
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CGMutablePathRef pathRef = CGPathCreateMutable();
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// 获取cell的size
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// 第一个参数,是整个 cell 的 bounds, 第二个参数是距左右两端的距离,第三个参数是距上下两端的距离
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CGRect bounds = CGRectInset(self.bounds, 10, 0);
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// CGRectGetMinY：返回对象顶点坐标
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// CGRectGetMaxY：返回对象底点坐标
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// CGRectGetMinX：返回对象左边缘坐标
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// CGRectGetMaxX：返回对象右边缘坐标
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// CGRectGetMidX: 返回对象中心点的X坐标
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// CGRectGetMidY: 返回对象中心点的Y坐标
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// 这里要判断分组列表中的第一行，每组section的第一行，每组section的中间行
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// CGPathAddRoundedRect(pathRef, nil, bounds, cornerRadius, cornerRadius);
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// 起始坐标为左下角，设为p，（CGRectGetMinX(bounds), CGRectGetMinY(bounds)）为左上角的点，设为p1(x1,y1)，(CGRectGetMidX(bounds), CGRectGetMinY(bounds))为顶部中点的点，设为p2(x2,y2)。然后连接p1和p2为一条直线l1，连接初始点p到p1成一条直线l，则在两条直线相交处绘制弧度为r的圆角。
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if (indexPath.row == 0) {
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if ([tableView numberOfRowsInSection:indexPath.section] == 1) {
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CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds));
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CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds), CGRectGetMidX(bounds), CGRectGetMinY(bounds), cornerRadius);
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CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
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CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds), CGRectGetMidX(bounds), CGRectGetMaxY(bounds), cornerRadius);
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CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds), CGRectGetMinX(bounds), CGRectGetMidY(bounds), cornerRadius);
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CGPathAddLineToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds));
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}else{
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// 初始起点为cell的左下角坐标
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CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds));
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CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds), CGRectGetMidX(bounds), CGRectGetMinY(bounds), cornerRadius);
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CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
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// 终点坐标为右下角坐标点，把绘图信息都放到路径中去,根据这些路径就构成了一块区域了
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CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds));
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}
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} else if (indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1) {
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// 初始起点为cell的左上角坐标
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CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds));
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CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds), CGRectGetMidX(bounds), CGRectGetMaxY(bounds), cornerRadius);
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CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
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// 添加一条直线，终点坐标为右下角坐标点并放到路径中去
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CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds));
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}else {
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// 添加cell的rectangle信息到path中（不包括圆角）
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CGPathAddRect(pathRef, nil, bounds);
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}
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// 把已经绘制好的可变图像路径赋值给图层，然后图层根据这图像path进行图像渲染render
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layer.path = pathRef;
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backgroundLayer.path = pathRef;
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// 注意：但凡通过Quartz2D中带有creat/copy/retain方法创建出来的值都必须要释放
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CFRelease(pathRef);
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// 按照shape layer的path填充颜色，类似于渲染render
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// layer.fillColor = [UIColor colorWithWhite:1.f alpha:0.8f].CGColor;
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layer.fillColor = [UIColor whiteColor].CGColor;
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// view大小与cell一致
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UIView *roundView = [[UIView alloc] initWithFrame:bounds];
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// 添加自定义圆角后的图层到roundView中
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[roundView.layer insertSublayer:layer atIndex:0];
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roundView.backgroundColor = UIColor.clearColor;
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// cell的背景view
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self.backgroundView = roundView;
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}
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@end
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