iOS：表格单元格页脚阴影

发布于 2025-01-05 19:50:52 字数 589 浏览 3 评论 0原文

我有一个只有几行的表格视图。因此，我没有显示一堆空白，而是向 tableview.footer 添加了一个空白 UIView。但是我希望最后一个单元格在 UIView 上投射阴影。我将如何实现这一目标？这是我当前的代码。

- (void)viewDidLoad
{
    [super viewDidLoad];
    UIView *emptyView = [[UIView alloc] initWithFrame:CGRectZero];
    CALayer *layer = [emptyView layer];
    [layer setShadowOffset:CGSizeMake(0, 1)];
    [layer setShadowColor:[[UIColor darkGrayColor] CGColor]];
    [layer setShadowRadius:8.0];
    [layer setShadowOpacity:0.8];
    self.tableView.tableFooterView = emptyView;
}

编辑：它将 UIView 添加到页脚，但不创建阴影。我不确定该层是解决此问题的最佳方法，甚至不确定该方法是否正确。

原文

I have a tableview with only a few rows. So instead of displaying a bunch of blanks I added a blank UIView to the tableview.footer. However I would like the last cell to cast a dropshadow on the UIView. How would I achieve this? Here is my current code.

- (void)viewDidLoad
{
    [super viewDidLoad];
    UIView *emptyView = [[UIView alloc] initWithFrame:CGRectZero];
    CALayer *layer = [emptyView layer];
    [layer setShadowOffset:CGSizeMake(0, 1)];
    [layer setShadowColor:[[UIColor darkGrayColor] CGColor]];
    [layer setShadowRadius:8.0];
    [layer setShadowOpacity:0.8];
    self.tableView.tableFooterView = emptyView;
}

EDIT:
It is adding the UIView to the footer but not creating the dropshadow. I'm not sure the layer is the best approach for this or even correct for this type of thing.

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帅气称霸 2025-01-12 19:50:52

这可能是因为你将框架设置为CGRectZero。

零矩形相当于 CGRectMake(0,0,0,0)。

零矩形 (x=0, y=0, width=0, height=0) 的阴影不会完全显示。

尝试给它一个合适的框架大小，你会看到差异。

也请查看此参考：https： //developer.apple.com/library/mac/#documentation/graphicsimaging/reference/CGGeometry/Reference/reference.html

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屋檐 2025-01-12 19:50:52

我最终使用了

shadowBackgroundView.layer.shadowOpacity = 0.3; 
shadowBackgroundView.layer.shadowRadius = 2;
shadowBackgroundView.layer.shadowColor = [[UIColor blackColor] CGColor];
shadowBackgroundView.layer.shadowOffset = CGSizeMake(0.0, 1.0);
CGPathRef shadowPath = [UIBezierPath bezierPathWithRoundedRect: shadowBackgroundView.bounds 
                                                         byRoundingCorners: UIRectCornerAllCorners
                                                               cornerRadii: CGSizeMake(PageCellBackgroundRadius, PageCellBackgroundRadius)].CGPath;
shadowBackgroundView.layer.shadowPath = shadowPath;
shadowBackgroundView.layer.shouldRasterize = YES;

[self addSubview: shadowBackgroundView];

I ended up using

shadowBackgroundView.layer.shadowOpacity = 0.3; 
shadowBackgroundView.layer.shadowRadius = 2;
shadowBackgroundView.layer.shadowColor = [[UIColor blackColor] CGColor];
shadowBackgroundView.layer.shadowOffset = CGSizeMake(0.0, 1.0);
CGPathRef shadowPath = [UIBezierPath bezierPathWithRoundedRect: shadowBackgroundView.bounds 
                                                         byRoundingCorners: UIRectCornerAllCorners
                                                               cornerRadii: CGSizeMake(PageCellBackgroundRadius, PageCellBackgroundRadius)].CGPath;
shadowBackgroundView.layer.shadowPath = shadowPath;
shadowBackgroundView.layer.shouldRasterize = YES;

[self addSubview: shadowBackgroundView];

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写下不归期 2025-01-12 19:50:52

在 cellForRowAtIndexPath: 函数中：

// drop shadow
cell.layer.shadowOpacity = 1.0;
cell.layer.shadowRadius = 1.7;
cell.layer.shadowColor = [UIColor blackColor].CGColor;
cell.layer.shadowOffset = CGSizeMake(0.0, 0.0);

In cellForRowAtIndexPath: function:

// drop shadow
cell.layer.shadowOpacity = 1.0;
cell.layer.shadowRadius = 1.7;
cell.layer.shadowColor = [UIColor blackColor].CGColor;
cell.layer.shadowOffset = CGSizeMake(0.0, 0.0);

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