iOS学习笔记8-UITableView的定制

UITableView在iOS的工程应用中，扮演着非常重要的角色，今天利用前一个demo继续做UITableView的介绍。

UITableView实现表格绘制，其中几个重要的方法，需要拿出来特别梳理：

1.使用UITableView进行表格显示时，需要设置UITableView的dataSource属性及其delegate属性，然后分别实现UItableViewDataSource协议和UItableViewDelegate协议的相关方法；

//tableView的定制    UITableView *setTableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 44, self.view.frame.size.width, self.view.frame.size.height - 44)style:UITableViewStyleGrouped];    setTableView.backgroundColor = [UIColor clearColor];    setTableView.dataSource = self;    setTableView.delegate = self;    [self.view addSubview:setTableView];

2.几个常用方法：

（1）- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{}

        此方法返回有多少段

//定义tableView- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{    return 1;}

例子中的效果图：

（2）- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{}

         此方法返回每段中单元格数量

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    //此处是想说明每段中返回的单元格数量，所以加了个else方法，如果想看else后面的效果，可以把上面- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView方法返回值改成2，以查看    if (section==0) {        return 5;    }else{        return 4;    }}

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

         此方法是对每个单元格（及cell）的定制

        就cell定制时，查看官方文档可知，cell共有四种风格，下面的demo中，我将四种风格都一一定制了出来：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    static NSString *Identifier = @"Identifier";    // Used by the delegate to acquire an already allocated(fenpei) cell, in lieu(replace) of allocating a new one.    //Identifier是标记，dequeueReusableCellWithIdentifier方法是当有可重用的cell时，根据标记直接取，而不用重新生成，可以提高效率。    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:Identifier];    if (!cell) {        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:Identifier];    }                    if (indexPath.section == 0 ) {            cell.backgroundColor = [UIColor orangeColor];            cell.textLabel.textColor = [UIColor whiteColor];            if (indexPath.row == 0) {                cell.textLabel.text = @"firstCell";                cell.textLabel.textColor = [UIColor whiteColor];                cell.textLabel.textAlignment = NSTextAlignmentCenter;                //cell的第二种风格                cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;                //                cell.imageView.image = [UIImage imageNamed:@"about_tag"];            }else if (indexPath.row == 1) {                cell.textLabel.text = @"secondCell";                cell.textLabel.textColor = [UIColor whiteColor];//                cell.textAlignment = UITextAlignmentCenter;                cell.textLabel.textAlignment = kCTCenterTextAlignment;                                cell.detailTextLabel.text = @"--2";                cell.detailTextLabel.textColor = [UIColor whiteColor];                cell.detailTextLabel.textAlignment = NSTextAlignmentCenter;                cell.detailTextLabel.font = [UIFont systemFontOfSize:16];                cell.detailTextLabel.textColor = [UIColor whiteColor];                cell.imageView.image = [UIImage imageNamed:@"version_tag"];                            }else if(indexPath.row == 2)            {                cell.textLabel.text = @"thirdCell";                cell.textLabel.textColor = [UIColor whiteColor];                cell.textLabel.textAlignment = NSTextAlignmentCenter;                cell.detailTextLabel.text = @"--3";                cell.detailTextLabel.textColor = [UIColor whiteColor];                //cell的第三种风格                cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;                cell.imageView.image = [UIImage imageNamed:@"introduce_tag"];                            }else if(indexPath.row ==3)            {                cell.textLabel.text = @"fourthCell";                cell.textLabel.textColor=[UIColor whiteColor];                cell.textLabel.textAlignment = NSTextAlignmentCenter;                cell.detailTextLabel.text = @"--4";                cell.detailTextLabel.textColor = [UIColor whiteColor];                cell.imageView.image = [UIImage imageNamed:@"about_tag"];                //cell的第一种风格                cell.accessoryType = UITableViewCellAccessoryNone;            }else if (indexPath.row ==4)            {                                cell.textLabel.text = @"fiveCell";                cell.textLabel.textAlignment = NSTextAlignmentCenter;                cell.textLabel.textColor = [UIColor whiteColor];                cell.detailTextLabel.text = @"---5";                cell.detailTextLabel.textColor = [UIColor whiteColor];                //cell的第四种风格                cell.accessoryType = UITableViewCellAccessoryCheckmark;                cell.imageView.image = [UIImage imageNamed:@"about_tag"];            }        }else if (indexPath.section ==1)        {            cell.backgroundColor = [UIColor cyanColor];            if (indexPath.row == 0) {                cell.textLabel.text = @"2-1";                cell.textLabel.textColor = [UIColor whiteColor];                cell.accessoryType = UITableViewCellAccessoryNone;                            }else if(indexPath.row ==1){                cell.textLabel.text =@"2-2";                cell.textLabel.textColor = [UIColor whiteColor];                cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;            }else if(indexPath.row ==2)            {                cell.textLabel.text = @"2-3";                cell.textLabel.textColor = [UIColor whiteColor];                cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;            }else if(indexPath.row ==3 )            {                cell.textLabel.text = @"2-4";                cell.textLabel.textColor = [UIColor whiteColor];                cell.accessoryType = UITableViewCellAccessoryCheckmark;            }        }    return cell;    }

（4）-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{}

       此方法是处理每个cell被选择后的动作

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{    if (indexPath.section == 0) {        if (indexPath.row == 0) {        [self performSelector:@selector(cancelAction)];    }else if (indexPath.row == 1)    {        [self performSelector:@selector(cancelAction)];    }else if (indexPath.row == 2)    {        [self performSelector:@selector(cancelAction)];            }else if (indexPath.row == 3)    {        [self performSelector:@selector(cancelAction)];    }else if (indexPath.row == 4)    {        [self performSelector:@selector(cancelAction)];    }}else if (indexPath.section == 1)    {            }}//选择器触发- (void)cancelAction{    NSString *message = @"你已经点击";    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"点击事件" message:message delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];    alert.frame=CGRectMake(0, 0, 80, 80);    alert.center = self.view.center;    [alert show];    }

（5）在定制cell时候，cell的第三种风格UITableViewCellAccessoryDetailDisclosureButton，如图：

那怎么为UITableViewCellAccessoryDetailDisclosureButton定制事件呢？查看文档可知，可以通过下面的方法定制：

- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath

//怎么为 UITableViewCellAccessoryDetailDisclosureButton 定义事件，发现在UITableViewDelegate 可以定义这个按钮的事件- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath{    NSInteger row = indexPath.row;    if (row == 2) {        NSLog(@"点击了cell右边按钮");        //    }}

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