我想自定义分组样式 UITableView 的背景和边框颜色。
我可以使用以下方法自定义背景颜色:
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?
我想自定义分组样式 UITableView 的背景和边框颜色。
我可以使用以下方法自定义背景颜色:
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 及更高版本中,UITableViewCell
现在有一个backgroundColor
属性使这变得非常容易(尤其是与[UIColor colorWithPatternImage:]
初始化程序结合使用)。但我会将 2.0 版本的答案留给任何需要它的人……</p>
这比它真正应该的要难。当我不得不这样做时,我是这样做的:
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,部分中的第一个单元格的顶部圆角,部分中的最后一个单元格的底部圆角,部分中间的单元格没有圆角, 并对包含一个单元格的部分的所有 4 个角进行舍入。
不幸的是,我无法弄清楚如何自动设置此模式,因此我不得不在 UITableViewDataSource 的 -cellForRowAtIndexPath 方法中进行设置。
这是一个真正的 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点滑稽,但我们改用了不同的设计,并在我有机会修复它之前取消了自定义背景。不过,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表格单元格有关,但如果有人想更改表格视图的背景颜色:
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;
首先感谢这段代码。我在此功能中进行了一些绘图更改,以消除绘图的角落问题。
-(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;
}
}
谢谢你的代码,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。(所有四个角都是圆形的。)
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;
}
我使用 Mike Akers 的上述 CustomCellBackgroundView 代码遇到的一件事可能对其他人有用:
cell.backgroundView
重用单元格时不会自动重绘,并且更改 backgroundView 的位置变量不会影响重用的单元格。cell.backgroundViews
这意味着考虑到它们的位置,长桌将被错误地绘制。
要解决此问题,而不必每次显示一行时都创建一个新的 backgroundView,请[cell.backgroundView setNeedsDisplay]
在-[UITableViewController tableView:cellForRowAtIndexPath:]
. 或者对于更可重用的解决方案,覆盖 CustomCellBackgroundView 的位置设置器以包含[self setNeedsDisplay]
.
感谢这篇超级有用的帖子。万一有人(比如我!)想要一个完全空的单元格背景,而不是通过 IB 中的图像/文本/其他内容自定义它,并且无法弄清楚如何摆脱愚蠢的边框/填充/即使您在 IB 中将其设置为清除背景...这是我用来解决问题的代码!
- (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;
}
希望这会帮助别人!似乎像魅力一样工作。
非常感谢所有发布代码的人。这非常有用。
我得出了一个类似的解决方案来更改分组表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 上仍然需要这个 PITA 解决方案......
下面的代码对使用渐变而不是一种纯色渲染高光进行了更改。边框渲染也被删除。享受。
//
// 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
要更改表格视图边框颜色:
在.h:
#import <QuartzCore/QuartzCore.h>
以 .m 为单位:
tableView.layer.masksToBounds=YES;
tableView.layer.borderWidth = 1.0f;
tableView.layer.borderColor = [UIColor whiteColor].CGColor;
通过添加大约 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
,也不要忘记应用这个小技巧。当您使用这种方法时,您应该将您的单元格从以下子类化PrettyTableViewCell
:
#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;
}
我一直有这个问题,并尝试了很多组合的东西,因为我注意到对于某些细胞它工作得很好,但对于其他细胞却不行。
奇怪的是,我发现可以将 cell.backgroundColor 设置为 lightGrayColor 并且一切正常 - 但是 blueColor 导致我无法更新外部边缘的问题。
除非使用绿色真的很重要——也许你可能想试试这个。这可能是一个让人们在指示单元格被选中时只使用灰色的功能。