如何自定义分组的表格视图单元格的背景/边框颜色？

我想自定义分组样式的UITableView的背景和边框颜色。

我可以使用以下方法自定义背景色：

tableView.contentView.backgroundColor = [UIColor greenColor];

但是边框颜色仍然是我不知道如何更改的东西。

如何自定义分组样式表视图的这两个方面？

更新：在iPhone OS 3.0和更高版本中，UITableViewCell现在具有一个backgroundColor属性，该属性使此操作变得非常容易（尤其是与[UIColor colorWithPatternImage:]初始化程序结合使用）。但我会将答案的2.0版本留给任何需要它的人……

这比实际的要难。这是我必须执行的操作：

您需要将UITableViewCell的backgroundView属性设置为自定义UIView，以适当的颜色绘制边框和背景本身。此视图需要能够以4种不同的模式绘制边框，在一个部分的第一个单元格的顶部四舍五入，在一个部分的最后一个单元格的底部四舍五入，在一个部分的中间没有圆角，并在包含一个单元格的部分的所有4个角处取整。

不幸的是，我无法弄清楚如何自动设置此模式，因此必须在UITableViewDataSource的-cellForRowAtIndexPath方法中进行设置。

这是真正的PITA，但我已经与Apple工程师确认，这是目前唯一的方法。

更新这是该自定义bg视图的代码。有一个绘图错误使圆角看起来有些有趣，但是在我有机会修复它之前，我们转到了另一种设计并废弃了自定义背景。尽管如此，这可能对您很有帮助：

//
//  CustomCellBackgroundView.h
//
//  Created by Mike Akers on 11/21/08.
//  Copyright 2008 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>

typedef enum  {
    CustomCellBackgroundViewPositionTop, 
    CustomCellBackgroundViewPositionMiddle, 
    CustomCellBackgroundViewPositionBottom,
    CustomCellBackgroundViewPositionSingle
} CustomCellBackgroundViewPosition;

@interface CustomCellBackgroundView : UIView {
    UIColor *borderColor;
    UIColor *fillColor;
    CustomCellBackgroundViewPosition position;
}

    @property(nonatomic, retain) UIColor *borderColor, *fillColor;
    @property(nonatomic) CustomCellBackgroundViewPosition position;
@end

//
//  CustomCellBackgroundView.m
//
//  Created by Mike Akers on 11/21/08.
//  Copyright 2008 __MyCompanyName__. All rights reserved.
//

#import "CustomCellBackgroundView.h"

static void addRoundedRectToPath(CGContextRef context, CGRect rect,
                                 float ovalWidth,float ovalHeight);

@implementation CustomCellBackgroundView
@synthesize borderColor, fillColor, position;

- (BOOL) isOpaque {
    return NO;
}

- (id)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        // Initialization code
    }
    return self;
}

- (void)drawRect:(CGRect)rect {
    // Drawing code
    CGContextRef c = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(c, [fillColor CGColor]);
    CGContextSetStrokeColorWithColor(c, [borderColor CGColor]);

    if (position == CustomCellBackgroundViewPositionTop) {
        CGContextFillRect(c, CGRectMake(0.0f, rect.size.height - 10.0f, rect.size.width, 10.0f));
        CGContextBeginPath(c);
        CGContextMoveToPoint(c, 0.0f, rect.size.height - 10.0f);
        CGContextAddLineToPoint(c, 0.0f, rect.size.height);
        CGContextAddLineToPoint(c, rect.size.width, rect.size.height);
        CGContextAddLineToPoint(c, rect.size.width, rect.size.height - 10.0f);
        CGContextStrokePath(c);
        CGContextClipToRect(c, CGRectMake(0.0f, 0.0f, rect.size.width, rect.size.height - 10.0f));
    } else if (position == CustomCellBackgroundViewPositionBottom) {
        CGContextFillRect(c, CGRectMake(0.0f, 0.0f, rect.size.width, 10.0f));
        CGContextBeginPath(c);
        CGContextMoveToPoint(c, 0.0f, 10.0f);
        CGContextAddLineToPoint(c, 0.0f, 0.0f);
        CGContextStrokePath(c);
        CGContextBeginPath(c);
        CGContextMoveToPoint(c, rect.size.width, 0.0f);
        CGContextAddLineToPoint(c, rect.size.width, 10.0f);
        CGContextStrokePath(c);
        CGContextClipToRect(c, CGRectMake(0.0f, 10.0f, rect.size.width, rect.size.height));
    } else if (position == CustomCellBackgroundViewPositionMiddle) {
        CGContextFillRect(c, rect);
        CGContextBeginPath(c);
        CGContextMoveToPoint(c, 0.0f, 0.0f);
        CGContextAddLineToPoint(c, 0.0f, rect.size.height);
        CGContextAddLineToPoint(c, rect.size.width, rect.size.height);
        CGContextAddLineToPoint(c, rect.size.width, 0.0f);
        CGContextStrokePath(c);
        return; // no need to bother drawing rounded corners, so we return
    }

    // At this point the clip rect is set to only draw the appropriate
    // corners, so we fill and stroke a rounded rect taking the entire rect

    CGContextBeginPath(c);
    addRoundedRectToPath(c, rect, 10.0f, 10.0f);
    CGContextFillPath(c);  

    CGContextSetLineWidth(c, 1);  
    CGContextBeginPath(c);
    addRoundedRectToPath(c, rect, 10.0f, 10.0f);  
    CGContextStrokePath(c); 
}


- (void)dealloc {
    [borderColor release];
    [fillColor release];
    [super dealloc];
}


@end

static void addRoundedRectToPath(CGContextRef context, CGRect rect,
                                float ovalWidth,float ovalHeight)

{
    float fw, fh;

    if (ovalWidth == 0 || ovalHeight == 0) {// 1
        CGContextAddRect(context, rect);
        return;
    }

    CGContextSaveGState(context);// 2

    CGContextTranslateCTM (context, CGRectGetMinX(rect),// 3
                           CGRectGetMinY(rect));
    CGContextScaleCTM (context, ovalWidth, ovalHeight);// 4
    fw = CGRectGetWidth (rect) / ovalWidth;// 5
    fh = CGRectGetHeight (rect) / ovalHeight;// 6

    CGContextMoveToPoint(context, fw, fh/2); // 7
    CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1);// 8
    CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1);// 9
    CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1);// 10
    CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1); // 11
    CGContextClosePath(context);// 12

    CGContextRestoreGState(context);// 13
}

我知道答案与更改分组的表格单元有关，但是如果有人要更改表格视图的背景色，则可以：

您不仅需要设置：

tableview.backgroundColor = color;

您还需要更改或摆脱背景视图：

tableview.backgroundView = nil;  

首先，感谢您的代码。我对该功能进行了一些图形更改，以消除图形的边角问题。

-(void)drawRect:(CGRect)rect 
{
    // Drawing code

    CGContextRef c = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(c, [fillColor CGColor]);
    CGContextSetStrokeColorWithColor(c, [borderColor CGColor]);
    CGContextSetLineWidth(c, 2);

    if (position == CustomCellBackgroundViewPositionTop) {

        CGFloat minx = CGRectGetMinX(rect) , midx = CGRectGetMidX(rect), maxx = CGRectGetMaxX(rect) ;
        CGFloat miny = CGRectGetMinY(rect) , maxy = CGRectGetMaxY(rect) ;
        minx = minx + 1;
        miny = miny + 1;

        maxx = maxx - 1;
        maxy = maxy ;

        CGContextMoveToPoint(c, minx, maxy);
        CGContextAddArcToPoint(c, minx, miny, midx, miny, ROUND_SIZE);
        CGContextAddArcToPoint(c, maxx, miny, maxx, maxy, ROUND_SIZE);
        CGContextAddLineToPoint(c, maxx, maxy);

        // Close the path
        CGContextClosePath(c);
        // Fill & stroke the path
        CGContextDrawPath(c, kCGPathFillStroke);        
        return;
    } else if (position == CustomCellBackgroundViewPositionBottom) {

        CGFloat minx = CGRectGetMinX(rect) , midx = CGRectGetMidX(rect), maxx = CGRectGetMaxX(rect) ;
        CGFloat miny = CGRectGetMinY(rect) , maxy = CGRectGetMaxY(rect) ;
        minx = minx + 1;
        miny = miny ;

        maxx = maxx - 1;
        maxy = maxy - 1;

        CGContextMoveToPoint(c, minx, miny);
        CGContextAddArcToPoint(c, minx, maxy, midx, maxy, ROUND_SIZE);
        CGContextAddArcToPoint(c, maxx, maxy, maxx, miny, ROUND_SIZE);
        CGContextAddLineToPoint(c, maxx, miny);
        // Close the path
        CGContextClosePath(c);
        // Fill & stroke the path
        CGContextDrawPath(c, kCGPathFillStroke);    
        return;
    } else if (position == CustomCellBackgroundViewPositionMiddle) {
        CGFloat minx = CGRectGetMinX(rect) , maxx = CGRectGetMaxX(rect) ;
        CGFloat miny = CGRectGetMinY(rect) , maxy = CGRectGetMaxY(rect) ;
        minx = minx + 1;
        miny = miny ;

        maxx = maxx - 1;
        maxy = maxy ;

        CGContextMoveToPoint(c, minx, miny);
        CGContextAddLineToPoint(c, maxx, miny);
        CGContextAddLineToPoint(c, maxx, maxy);
        CGContextAddLineToPoint(c, minx, maxy);

        CGContextClosePath(c);
        // Fill & stroke the path
        CGContextDrawPath(c, kCGPathFillStroke);    
        return;
    }
}

谢谢您提供的代码，这正是我想要的。我还在Vimal的代码中添加了以下代码，以实现CustomCellBackgroundViewPositionSingle单元格的情况。（所有四个角都是圆角的。）

else if (position == CustomCellBackgroundViewPositionSingle)
{
        CGFloat minx = CGRectGetMinX(rect) , midx = CGRectGetMidX(rect), maxx = CGRectGetMaxX(rect) ;
        CGFloat miny = CGRectGetMinY(rect) , midy = CGRectGetMidY(rect) , maxy = CGRectGetMaxY(rect) ;
        minx = minx + 1;
        miny = miny + 1;

        maxx = maxx - 1;
        maxy = maxy - 1;

        CGContextMoveToPoint(c, minx, midy);
        CGContextAddArcToPoint(c, minx, miny, midx, miny, ROUND_SIZE);
        CGContextAddArcToPoint(c, maxx, miny, maxx, midy, ROUND_SIZE);
        CGContextAddArcToPoint(c, maxx, maxy, midx, maxy, ROUND_SIZE);
        CGContextAddArcToPoint(c, minx, maxy, minx, midy, ROUND_SIZE);

        // Close the path
        CGContextClosePath(c);
        // Fill & stroke the path
        CGContextDrawPath(c, kCGPathFillStroke);                
        return;     
}

我遇到了上面来自Mike Akers的CustomCellBackgroundView代码的一件事，这可能对其他人有用：

cell.backgroundView重用单元格时不会自动重绘，并且backgroundView的位置var的更改不会影响重用的单元格。这意味着长桌将不正确地绘制cell.backgroundViews给定的位置。

要解决此问题而不必在每次显示一行时都创建新的backgroundView，请[cell.backgroundView setNeedsDisplay]在的末尾进行调用-[UITableViewController tableView:cellForRowAtIndexPath:]。或者，对于更可重用的解决方案，请覆盖CustomCellBackgroundView的位置设置器以包含[self setNeedsDisplay]。

感谢这篇超级有用的文章。如果有人在那里（像我一样！）只是想拥有一个完全空的单元格背景来代替通过IB中的图像/文本/其他内容对其进行自定义，并且无法弄清楚如何摆脱愚蠢的边框/填充/即使您将其设置为在IB中也清除背景...这是我使用的实现成功的代码！

- (UITableViewCell *) tableView: (UITableView *) tableView cellForRowAtIndexPath: (NSIndexPath *) indexPath {

    static NSString *cellId = @"cellId";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: cellId];
    if (cell == nil) {
        [[NSBundle mainBundle] loadNibNamed:@"EditTableViewCell" owner:self options:nil];
        cell = cellIBOutlet;
        self.cellIBOutlet = nil;
    }

    cell.backgroundView = [[[UIView alloc] initWithFrame: CGRectZero] autorelease];
    [cell.backgroundView setNeedsDisplay];

    ... any other cell customizations ...

    return cell;
}

希望能对其他人有所帮助！看起来像是一种魅力。

非常感谢所有发布代码的人。这非常有用。

我派生了一个类似的解决方案，可以更改分组的表格视图单元格的突出显示颜色。基本上是UITableViewCell的selectedBackgroundView（不是backgroundView）。据我所知，即使在iPhone OS 3.0上，哪一个仍需要此PITA解决方案。

下面的代码进行了更改，以使用渐变而不是一种纯色呈现高光。边框渲染也将被删除。请享用。

//
//  CSCustomCellBackgroundView.h
//

#import <UIKit/UIKit.h>

typedef enum  
{
    CustomCellBackgroundViewPositionTop, 
    CustomCellBackgroundViewPositionMiddle, 
    CustomCellBackgroundViewPositionBottom,
    CustomCellBackgroundViewPositionSingle,
    CustomCellBackgroundViewPositionPlain
} CustomCellBackgroundViewPosition;

@interface CSCustomCellBackgroundView : UIView 
{
    CustomCellBackgroundViewPosition position;
 CGGradientRef gradient;
}

@property(nonatomic) CustomCellBackgroundViewPosition position;

@end



//
//  CSCustomCellBackgroundView.m
//

#import "CSCustomCellBackgroundView.h"



#define ROUND_SIZE 10


static void addRoundedRectToPath(CGContextRef context, CGRect rect,
         float ovalWidth,float ovalHeight);


@implementation CSCustomCellBackgroundView


@synthesize position;

- (BOOL) isOpaque 
{
    return NO;
}

- (id)initWithFrame:(CGRect)frame 
{
    if (self = [super initWithFrame:frame]) 
 {
        // Initialization code
  const float* topCol = CGColorGetComponents([[UIColor redColor] CGColor]);
  const float* bottomCol = CGColorGetComponents([[UIColor blueColor] CGColor]);

  CGColorSpaceRef rgb = CGColorSpaceCreateDeviceRGB();
  /*
  CGFloat colors[] =
  {
   5.0 / 255.0, 140.0 / 255.0, 245.0 / 255.0, 1.00,
   1.0 / 255.0,  93.0 / 255.0, 230.0 / 255.0, 1.00,
  };*/
  CGFloat colors[]=
  {
   topCol[0], topCol[1], topCol[2], topCol[3],
   bottomCol[0], bottomCol[1], bottomCol[2], bottomCol[3]
  };
  gradient = CGGradientCreateWithColorComponents(rgb, colors, NULL, sizeof(colors)/(sizeof(colors[0])*4));
  CGColorSpaceRelease(rgb);
    }
    return self;
}


-(void)drawRect:(CGRect)rect 
{
    // Drawing code

    CGContextRef c = UIGraphicsGetCurrentContext();

    if (position == CustomCellBackgroundViewPositionTop) 
 {

        CGFloat minx = CGRectGetMinX(rect) , midx = CGRectGetMidX(rect), maxx = CGRectGetMaxX(rect) ;
        CGFloat miny = CGRectGetMinY(rect) , maxy = CGRectGetMaxY(rect) ;
        minx = minx + 1;
        miny = miny + 1;

        maxx = maxx - 1;
        maxy = maxy ;

        CGContextMoveToPoint(c, minx, maxy);
        CGContextAddArcToPoint(c, minx, miny, midx, miny, ROUND_SIZE);
        CGContextAddArcToPoint(c, maxx, miny, maxx, maxy, ROUND_SIZE);
        CGContextAddLineToPoint(c, maxx, maxy);

        // Close the path
        CGContextClosePath(c);

  CGContextSaveGState(c);
  CGContextClip(c);
  CGContextDrawLinearGradient(c, gradient, CGPointMake(minx,miny), CGPointMake(minx,maxy), kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation);
  CGContextRestoreGState(c);

        return;
    } 
 else if (position == CustomCellBackgroundViewPositionBottom) 
 {

        CGFloat minx = CGRectGetMinX(rect) , midx = CGRectGetMidX(rect), maxx = CGRectGetMaxX(rect) ;
        CGFloat miny = CGRectGetMinY(rect) , maxy = CGRectGetMaxY(rect) ;
        minx = minx + 1;
        miny = miny + 1;

        maxx = maxx - 1;
        maxy = maxy - 1;

        CGContextMoveToPoint(c, minx, miny);
        CGContextAddArcToPoint(c, minx, maxy, midx, maxy, ROUND_SIZE);
        CGContextAddArcToPoint(c, maxx, maxy, maxx, miny, ROUND_SIZE);
        CGContextAddLineToPoint(c, maxx, miny);
        // Close the path
        CGContextClosePath(c);

  CGContextSaveGState(c);
  CGContextClip(c);
  CGContextDrawLinearGradient(c, gradient, CGPointMake(minx,miny), CGPointMake(minx,maxy), kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation);
  CGContextRestoreGState(c);

        return;
    } 
 else if (position == CustomCellBackgroundViewPositionMiddle) 
 {
        CGFloat minx = CGRectGetMinX(rect) , maxx = CGRectGetMaxX(rect) ;
        CGFloat miny = CGRectGetMinY(rect) , maxy = CGRectGetMaxY(rect) ;
        minx = minx + 1;
        miny = miny + 1;

        maxx = maxx - 1;
        maxy = maxy ;

        CGContextMoveToPoint(c, minx, miny);
        CGContextAddLineToPoint(c, maxx, miny);
        CGContextAddLineToPoint(c, maxx, maxy);
        CGContextAddLineToPoint(c, minx, maxy);
  // Close the path
        CGContextClosePath(c);

  CGContextSaveGState(c);
  CGContextClip(c);
  CGContextDrawLinearGradient(c, gradient, CGPointMake(minx,miny), CGPointMake(minx,maxy), kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation);
  CGContextRestoreGState(c);

        return;
    }
 else if (position == CustomCellBackgroundViewPositionSingle)
 {
        CGFloat minx = CGRectGetMinX(rect) , midx = CGRectGetMidX(rect), maxx = CGRectGetMaxX(rect) ;
        CGFloat miny = CGRectGetMinY(rect) , midy = CGRectGetMidY(rect) , maxy = CGRectGetMaxY(rect) ;
        minx = minx + 1;
        miny = miny + 1;

        maxx = maxx - 1;
        maxy = maxy - 1;

        CGContextMoveToPoint(c, minx, midy);
        CGContextAddArcToPoint(c, minx, miny, midx, miny, ROUND_SIZE);
        CGContextAddArcToPoint(c, maxx, miny, maxx, midy, ROUND_SIZE);
        CGContextAddArcToPoint(c, maxx, maxy, midx, maxy, ROUND_SIZE);
        CGContextAddArcToPoint(c, minx, maxy, minx, midy, ROUND_SIZE);
        // Close the path
        CGContextClosePath(c);              

  CGContextSaveGState(c);
  CGContextClip(c);
  CGContextDrawLinearGradient(c, gradient, CGPointMake(minx,miny), CGPointMake(minx,maxy), kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation);
  CGContextRestoreGState(c);

        return;         
 } 
 else if (position == CustomCellBackgroundViewPositionPlain) {
    CGFloat minx = CGRectGetMinX(rect);
    CGFloat miny = CGRectGetMinY(rect), maxy = CGRectGetMaxY(rect) ;
    CGContextDrawLinearGradient(c, gradient, CGPointMake(minx,miny), CGPointMake(minx,maxy), kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation);
    return;
}

}

- (void)dealloc 
{
    CGGradientRelease(gradient);
    [super dealloc];
}


- (void) setPosition:(CustomCellBackgroundViewPosition)inPosition
{
 if(position != inPosition)
 {
  position = inPosition;
  [self setNeedsDisplay];
 }
}

@end


static void addRoundedRectToPath(CGContextRef context, CGRect rect,
         float ovalWidth,float ovalHeight)

{
    float fw, fh;

    if (ovalWidth == 0 || ovalHeight == 0) {// 1
        CGContextAddRect(context, rect);
        return;
    }

    CGContextSaveGState(context);// 2

    CGContextTranslateCTM (context, CGRectGetMinX(rect),// 3
         CGRectGetMinY(rect));
    CGContextScaleCTM (context, ovalWidth, ovalHeight);// 4
    fw = CGRectGetWidth (rect) / ovalWidth;// 5
    fh = CGRectGetHeight (rect) / ovalHeight;// 6

    CGContextMoveToPoint(context, fw, fh/2); // 7
    CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1);// 8
    CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1);// 9
    CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1);// 10
    CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1); // 11
    CGContextClosePath(context);// 12

    CGContextRestoreGState(context);// 13
}

您可以通过设置自定义边框颜色

tableView.separatorColor

更改表格视图边框的颜色：

In.h：

#import <QuartzCore/QuartzCore.h>

在.m中：

tableView.layer.masksToBounds=YES;
tableView.layer.borderWidth = 1.0f;
tableView.layer.borderColor = [UIColor whiteColor].CGColor;

通过添加约5行代码，可以使用PrettyKit轻松完成此任务。如果您使用nib文件或storyboard，也不要忘记应用此小技巧。使用这种方法时，应该从PrettyTableViewCell以下子类继承单元：

#import <PrettyKit/PrettyKit.h>

@class RRSearchHistoryItem;

@interface RRSearchHistoryCell : PrettyTableViewCell

这是我的例子cellForRowAtIndexPath：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  static NSString *cellIdentifier = @"RRSearchHistoryCell";

  RRSearchHistoryCell *cell = (RRSearchHistoryCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifier];

  if ( cell == nil ) {

    NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"RRSearchHistoryCell" owner:self options:nil];
    cell = topLevelObjects[0];
    cell.gradientStartColor = RGB(0xffffff);
    cell.gradientEndColor = RGB(0xf3f3f3);

  }

  RRSearchHistoryItem *item = _historyTableData[indexPath.row];
  [cell setHistoryItem:item];


  [cell prepareForTableView:tableView indexPath:indexPath];

  return cell;
}

我一直对此有疑问，并尝试了许多事情的组合，因为我注意到对于某些单元格它可以正常工作，但对于其他单元格则不能。

奇怪的是，我发现可以将cell.backgroundColor设置为lightGrayColor，并且都可以正常工作-但是blueColor导致我不更新外部边缘的问题。

除非使用绿色真的很重要-否则您可能想尝试一下。这可能是一项功能，使人们在选择单元格时仅使用灰色。