iOS绘制虚线框

本示例为在tableview底部添加一个虚线框，方法亦可用于其他场景。

- (void)setUpSectionView{
    sectionView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, kSCREEN_WIDTH, 110)];
    sectionView.backgroundColor = [UIColor clearColor];

    UIImageView* footerBackView = [[UIImageView alloc]init];
    footerBackView.frame = CGRectMake(10, 10, kSCREEN_WIDTH - 20, 100);
    footerBackView.backgroundColor = [UIColor whiteColor];
    [sectionView addSubview:footerBackView];

    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    [shapeLayer setBounds:sectionView.bounds];
    [shapeLayer setPosition:sectionView.center];
    [shapeLayer setFillColor:[[UIColor clearColor] CGColor]];

    // 设置虚线颜色为blackColor
    [shapeLayer setStrokeColor:[[UIColor blackColor] CGColor]];
    [shapeLayer setStrokeColor:[HMMainlColor CGColor]];

    // 3.0f设置虚线的宽度
    [shapeLayer setLineWidth:1.0f];
    [shapeLayer setLineJoin:kCALineJoinRound];

    // 3=线的宽度 1=每条线的间距
    [shapeLayer setLineDashPattern:
     [NSArray arrayWithObjects:[NSNumber numberWithInt:5],
      [NSNumber numberWithInt:3],nil]];

    // Setup the path
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, 10, 10);
    CGPathAddLineToPoint(path, NULL, kSCREEN_WIDTH - 10,10);
    CGPathMoveToPoint(path, NULL, kSCREEN_WIDTH - 10, 110);
    CGPathAddLineToPoint(path, NULL, 10, 110);
    CGPathMoveToPoint(path, NULL, 10, 10);
    CGPathAddLineToPoint(path, NULL, 10, 110);
    CGPathMoveToPoint(path, NULL, kSCREEN_WIDTH - 10, 10);
    CGPathAddLineToPoint(path, NULL, kSCREEN_WIDTH - 10, 110);

    [shapeLayer setPath:path];
    CGPathRelease(path);

    // 可以把self改成任何你想要的UIView, 下图演示就是放到UITableViewCell中的
    [[sectionView layer] addSublayer:shapeLayer];

    addButton = [[UIButton alloc]init];
    [sectionView addSubview:addButton];
    [addButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.mas_equalTo(footerBackView.mas_left);
        make.top.mas_equalTo(footerBackView.mas_top);
        make.right.mas_equalTo(footerBackView.mas_right);
        make.height.mas_equalTo(footerBackView.mas_height);
    }];
    addButton.pr_acceptEventInterval = 2;
    addButton.titleLabel.font = HMFontSize(16);
    [addButton setImage:[UIImage imageNamed:@"my_add"] forState:UIControlStateNormal];
    [addButton setTitle:@"  添加XXX" forState:UIControlStateNormal];
    [addButton setTitleColor:[UIColor lightGrayColor] forState:UIControlStateNormal];
    [addButton addTarget:self action:@selector(addButtonClick:) forControlEvents:UIControlEventTouchUpInside];
    
    self.myTableView.tableFooterView = sectionView;
    
}