IOS中UITableviewCell 这种效果怎么实现?

Question

如图:所示

OC纯代码布局TableviewCell 的两端并没有对齐屏幕(箭头中指的线就是屏幕的边框)
还有就是上面三个cell.
第0行的左上和右上有圆角.第1行的是没有圆角的.第2行的左下和右下有圆角
这样的效果怎么封装?
快快快,代码贴出来啊...谢谢啦...

Answer 1

圆角的cell，之前iOS 6的时候是这种的（拟物），iOS 7 （扁平化）之后就进行了修改！

主要的实现在tableView的代理方法中 - (void)tableView:willDisplayCell: forRowAtIndexPath: ,绘制table view cell 的背景view。

下面的代码，你可以直接拷贝到控制器中演示效果，如果要集成到你自己的代码中，你需要把 - (void)tableView:willDisplayCell: forRowAtIndexPath: 这个方法中的东西拷贝过去，还要修改table view 的样式是分组和分割线为 none，这些在 - viewDidLoad中你也可以找到。

//  圆角cell

#import "ViewController.h"

@interface ViewController ()<UITableViewDelegate,UITableViewDataSource>


@property (strong, nonatomic)NSArray *dataSource;


@end

@implementation ViewController

//懒加载--数据源
- (NSArray *)dataSource
{
    if (!_dataSource) {
        _dataSource = @[@[@"我发布的",@"我回复的",@"我喜欢的"],@[@"关于我们",@"退出登录"]];
    }
    
    return  _dataSource;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
#pragma mark - 这里注意样式--分组
    UITableView *tableView = [[UITableView alloc] initWithFrame:self.view.frame style:UITableViewStyleGrouped];

    
    tableView.dataSource = self;
    tableView.delegate = self;
#pragma mark - 把原生的分割线去掉
    tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
#pragma mark - 这里我不让cell选择了
    tableView.allowsSelection = NO;
    [self.view addSubview:tableView];
}



#pragma mark- UITableViewDelegate or dataSource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return  self.dataSource.count;
}
//单元格的个数
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    NSArray *array = self.dataSource[section];
    return  array.count;
}
//cell创建
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *ID = @"cell";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID];
        
    }

    cell.textLabel.text = self.dataSource[indexPath.section][indexPath.row];
    cell.imageView.image = [UIImage imageNamed:@"icon"];
    return  cell;
}

#pragma mark- cell 将要显示的时候调用这个方法，就在这个方法内进行圆角绘制
/**
本质：就是修改cell的背景view，这个view的layer层自己分局cell的类型（顶，底和中间）来绘制*/
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if ([cell respondsToSelector:@selector(tintColor)])
    {
        CGFloat cornerRadius = 5.f;//圆角大小
        cell.backgroundColor = [UIColor clearColor];
        CAShapeLayer *layer = [[CAShapeLayer alloc] init];
        CGMutablePathRef pathRef = CGPathCreateMutable();
        CGRect bounds = CGRectInset(cell.bounds, 10, 0);
        BOOL addLine = NO;
        
        if (indexPath.row == 0 && indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1)
        {
            CGPathAddRoundedRect(pathRef, nil, bounds, cornerRadius, cornerRadius);

        }
        else if (indexPath.row == 0)
        {   //最顶端的Cell（两个向下圆弧和一条线）
            CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds));
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds), CGRectGetMidX(bounds), CGRectGetMinY(bounds), cornerRadius);
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
            CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds));
            addLine = YES;
        }
        else if (indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1)
        {   //最底端的Cell（两个向上的圆弧和一条线）
            CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds));
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds), CGRectGetMidX(bounds), CGRectGetMaxY(bounds), cornerRadius);
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
            CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds));
        }
        else
        {   //中间的Cell
            CGPathAddRect(pathRef, nil, bounds);
            addLine = YES;
        }
        layer.path = pathRef;
        CFRelease(pathRef);
        layer.fillColor = [UIColor whiteColor].CGColor; //cell的填充颜色
        layer.strokeColor = [UIColor lightGrayColor].CGColor; //cell 的边框颜色
        
        if (addLine == YES) {
            CALayer *lineLayer = [[CALayer alloc] init];
            CGFloat lineHeight = (1.f / [UIScreen mainScreen].scale);
            lineLayer.frame = CGRectMake(CGRectGetMinX(bounds), bounds.size.height-lineHeight, bounds.size.width, lineHeight);
            lineLayer.backgroundColor = [UIColor lightGrayColor].CGColor;        //绘制中间间隔线
            [layer addSublayer:lineLayer];
        }
        
        UIView *bgView = [[UIView alloc] initWithFrame:bounds];
        [bgView.layer insertSublayer:layer atIndex:0];
        bgView.backgroundColor = UIColor.clearColor;
        cell.backgroundView = bgView;
    }
}


@end

效果图：

Answer 2

我之前这种排列也可以不用UITableViewCell,而是直接用自定义UIView.外面整个有圆角，里面放两个按钮即可。
假如用UITableViewCell，那么其圆角最好是UI给带圆角的背景图，然后自定义里面的视图就行。

Answer 3

自定义cell
然后重写 setframe

Answer 4

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath

这个方法比layoutSubviews方法先调用,以至于我在layoutSubviews方法修改了Cell的宽度.

#import "LMSMeViewCell.h"

@implementation LMSMeViewCell

- (void)layoutSubviews {
    [super layoutSubviews];
    
    //修改cell的frame
    CGRect rect = self.frame;
    //如果已经修改过就不用修改了
    if (self.frame.size.width == SCREEN_WIDTH) {
         NSLog(@"%f",SCREEN_WIDTH);
        rect = CGRectMake(self.frame.origin.x + 10, self.frame.origin.y, self.frame.size.width - 20, self.frame.size.height);
    }
    self.frame = rect;
    
    NSLog(@"**********%@",NSStringFromCGRect(rect));
    
    self.textLabel.font = [UIFont systemFontOfSize:13];
    self.textLabel.textColor = [UIColor colorWithRed:0.51 green:0.51 blue:0.51 alpha:1];
    
    [self.imageView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.contentView).offset(10);
        make.width.height.offset(22);
        make.centerY.equalTo(self.contentView);
    }];
    
    [self.textLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.imageView.mas_right).offset(20);
        make.centerY.equalTo(self.imageView.mas_centerY);
    }];
}
@end

Controller关键代码:

#pragma mark- cell 将要显示的时候调用这个方法，就在这个方法内进行圆角绘制
/**
 本质：就是修改cell的背景view，这个view的layer层自己分局cell的类型（顶，底和中间）来绘制*/
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"___");
    if ([cell respondsToSelector:@selector(tintColor)])
    {
        CGFloat cornerRadius = 6.f;//圆角大小
        cell.backgroundColor = [UIColor clearColor];
        CAShapeLayer *layer = [[CAShapeLayer alloc] init];
        CGMutablePathRef pathRef = CGPathCreateMutable();
        CGRect bounds = CGRectInset(cell.bounds, 0, 0);
        
        NSLog(@"___%@",NSStringFromCGRect(bounds));
        
//        CGRect bounds = CGRectInset(cell.frame, 0, 0);
        BOOL addLine = NO;
        
        if (indexPath.row == 0 && indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1)
        {
            CGPathAddRoundedRect(pathRef, nil, bounds, cornerRadius, cornerRadius);
            
        }
        else if (indexPath.row == 0)
        {   //最顶端的Cell（两个向下圆弧和一条线）
            CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds));
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds), CGRectGetMidX(bounds), CGRectGetMinY(bounds), cornerRadius);
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
            CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds));
            addLine = YES;
        }
        else if (indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1)
        {   //最底端的Cell（两个向上的圆弧和一条线）
            CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds));
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds), CGRectGetMidX(bounds), CGRectGetMaxY(bounds), cornerRadius);
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
            CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds));
        }
        else
        {   //中间的Cell
            CGPathAddRect(pathRef, nil, bounds);
            addLine = YES;
        }
        layer.path = pathRef;
        CFRelease(pathRef);
        layer.fillColor = [UIColor orangeColor].CGColor; //cell的填充颜色
//        layer.strokeColor = [UIColor lightGrayColor].CGColor; //cell 的边框颜色
        layer.strokeColor = [UIColor colorWithRed:0.8 green:0.8 blue:0.8 alpha:1].CGColor;
        
        
        if (addLine == YES) {
            CALayer *lineLayer = [[CALayer alloc] init];
            CGFloat lineHeight = (1.f / [UIScreen mainScreen].scale);
            lineLayer.frame = CGRectMake(CGRectGetMinX(bounds), bounds.size.height-lineHeight, bounds.size.width, lineHeight);
            lineLayer.backgroundColor = [UIColor lightGrayColor].CGColor;        //绘制中间间隔线
            [layer addSublayer:lineLayer];
        }
        
        UIView *bgView = [[UIView alloc] initWithFrame:bounds];
        [bgView.layer insertSublayer:layer atIndex:0];
        bgView.backgroundColor = UIColor.clearColor;
        cell.backgroundView = bgView;
    }
}