表格视图的使用

IOS表格视图由单元格 （一般可重复使用） 组成，用于显示垂直滚动的视图。

在iOS 中,表格视图用于显示数据列表,如联系人、待办事项或购物项列表。

重要的属性

• delegate
• dataSource
• rowHeight
• sectionFooterHeight
• sectionHeaderHeight
• separatorColor
• tableHeaderView
• tableFooterView

重要的方法

- (UITableViewCell *)cellForRowAtIndexPath:(NSIndexPath *)indexPath

- (void)deleteRowsAtIndexPaths:(NSArray *)indexPaths   withRowAnimation:(UITableViewRowAnimation)animation   

- (id)dequeueReusableCellWithIdentifier:(NSString *)identifier

- (id)dequeueReusableCellWithIdentifier:(NSString *)identifier   forIndexPath:(NSIndexPath *)indexPath   

- (void)reloadData

- (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths   withRowAnimation:(UITableViewRowAnimation)animation   

- (NSArray *)visibleCells

示例代码和步骤

1.在ViewController.xib中添加表格视图，如下所示

2. 通过右键单击并选择数据源和委托将委托和数据源设定到"File's Owner（文件的所有者）"。设置数据源如下所示

3.为表格视图创建IBOutlet的并将其命名为myTableView。如以下图片中所示

4. 为拥有数据，添加一个NSMutableArray使其能够在列表格视图中显示

5.ViewController应采用的UITableViewDataSource和UITableViewDelegate协议。ViewController.h代码如下所示

#import <UIKit/UIKit.h>@interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>{        IBOutlet UITableView *myTableView;    NSMutableArray *myData;}@end

6.执行所需的表格视图委托和数据源的方法。更新ViewController.m，如下所示

#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];    // table view data is being set here        myData = [[NSMutableArray alloc]initWithObjects:    @"Data 1 in array",@"Data 2 in array",@"Data 3 in array",    @"Data 4 in array",@"Data 5 in array",@"Data 5 in array",    @"Data 6 in array",@"Data 7 in array",@"Data 8 in array",    @"Data 9 in array", nil];    // Do any additional setup after loading the view, typically from a nib.}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}#pragma mark - Table View Data source - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:  (NSInteger)section{    return [myData count]/2;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:  (NSIndexPath *)indexPath{    static NSString *cellIdentifier = @"cellID";        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:    cellIdentifier];    if (cell == nil) {        cell = [[UITableViewCell alloc]initWithStyle:        UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];    }    NSString *stringForCell;    if (indexPath.section == 0) {        stringForCell= [myData objectAtIndex:indexPath.row];    }    else if (indexPath.section == 1){        stringForCell= [myData objectAtIndex:indexPath.row+ [myData count]/2];    }    [cell.textLabel setText:stringForCell];    return cell;}// Default is 1 if not implemented- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{    return 2;}- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:  (NSInteger)section{    NSString *headerTitle;    if (section==0) {        headerTitle = @"Section 1 Header";    }    else{        headerTitle = @"Section 2 Header";    }    return headerTitle;}- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:  (NSInteger)section{    NSString *footerTitle;    if (section==0) {        footerTitle = @"Section 1 Footer";    }    else{        footerTitle = @"Section 2 Footer";            }    return footerTitle;}#pragma mark - TableView delegate-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath: (NSIndexPath *)indexPath{    [tableView deselectRowAtIndexPath:indexPath animated:YES];    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];    NSLog(@"Section:%d Row:%d selected and its data is %@",    indexPath.section,indexPath.row,cell.textLabel.text);}@end

7.现在当我们运行应用程序时我们就会得到下面的输出