UiTableView 使用技巧1 (datamodel与datasource独立)

在翻看代码的时候,因为使用UITableView的原因.导致代码很长.虽然有函数定位功能.不过datasource与datamodel经常糅合在controller里面.感觉很不清爽.修改起来也麻烦.在学习苹果官方自带文档以后.做了如下修改.先看示例.后发代码

以上的代码viewcontroller中,完全隐藏了datamodel与datasouce的实现.使得viewcontroller的逻辑看起来很条理很清晰.

而且隐藏以后.datamodel与datasource互相独立.保持接口一致.这样datamodel可以随意修改数据的来源.datasource可以随意修改cell的显示.而controller只需要负责协调各部分view的关系即可.

下面是代码:

////  main.m//  ControlDemo////  Created by watsy0007 on 12-6-3.//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.//#import <UIKit/UIKit.h>#define BARBUTTONITEM(title,act) [[[UIBarButtonItem alloc] initWithTitle:title \style:UIBarButtonItemStylePlain \target:self \action:act] autorelease];//--------------------------------------------------------------------------------------------#pragma mark -#pragma mark tableDataModel()@interface tableDataModel : NSObject {    NSDictionary *_dataDictionary_;}- (NSInteger) numberOfSections;- (NSArray *) sections;- (NSInteger) numberOfRowAtSection:(NSInteger) nSection;- (NSArray *) rowAtSection:(NSInteger) nSection;@end@implementation tableDataModel- (id) init {    if (self = [super init]) {        _dataDictionary_ = [[NSDictionary alloc] initWithObjectsAndKeys:                                                        [NSArray arrayWithObjects:                                                          [NSDictionary dictionaryWithObjectsAndKeys:@"管理员1",@"title",@"超级管理员",@"subtitle", nil],                             [NSDictionary dictionaryWithObjectsAndKeys:@"管理员2",@"title",@"普通管理员",@"subtitle", nil]                                                          , nil],@"管理员",                                                        [NSArray arrayWithObjects:                                                          [NSDictionary dictionaryWithObjectsAndKeys:@"用户1",@"title",@"小王",@"subtitle", nil]                             ,                             [NSDictionary dictionaryWithObjectsAndKeys:@"用户2",@"title",@"小张",@"subtitle", nil]                                                          , nil],@"用户",                                                        nil];    }    return self;}- (void) dealloc {    [_dataDictionary_ release];        [super dealloc];}- (NSInteger) numberOfSections {    return [[_dataDictionary_ allKeys] count];}- (NSArray *) sections {    return [_dataDictionary_ allKeys];}- (NSInteger) numberOfRowAtSection:(NSInteger) nSection {    if (nSection < [self numberOfSections]) {        NSString *sKey = [[self sections] objectAtIndex:nSection];        return [[_dataDictionary_ objectForKey:sKey] count];    }        return 0;}- (NSArray *) rowAtSection:(NSInteger) nSection {    if (nSection < [self numberOfSections]) {        NSString *sKey = [[self sections] objectAtIndex:nSection];        return [_dataDictionary_ objectForKey:sKey];    }        return nil;}@end//--------------------------------------------------------------------------------------------#pragma mark -#pragma mark tableDatasource()@interface tableDataSource : NSObject <UITableViewDataSource>@property (nonatomic, assign) tableDataModel *dModel;@end@implementation tableDataSource@synthesize dModel = _dModel;#pragma mark -#pragma mark table view datasource delegate- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {    return [_dModel numberOfSections];}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {    return [_dModel numberOfRowAtSection:section];}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {    static NSString *strCell = @"demoCell";    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:strCell];    if (!cell) {        //UITableViewCellStyleDefault        //UITableViewCellStyleSubtitle        //UITableViewCellStyleValue1        //UITableViewCellStyleValue2        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue2                                      reuseIdentifier:strCell];    }        NSDictionary *dict = [[_dModel rowAtSection:[indexPath section]] objectAtIndex:[indexPath row]];            cell.textLabel.text = [dict objectForKey:@"title"];    cell.detailTextLabel.text = [dict objectForKey:@"subtitle"];        return cell;}- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {    return [NSString stringWithFormat:@"标题:%@",[[_dModel sections] objectAtIndex:section]];}- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section {    return [NSString stringWithFormat:@"标题:%@",[[_dModel sections] objectAtIndex:section]];}@end//--------------------------------------------------------------------------------------------#pragma mark -#pragma mark ViewController()@interface ViewController : UIViewController <UITableViewDataSource,UITableViewDelegate> {    UITableView *_tableView_;    tableDataModel  *_dModel;    tableDataSource     *_dSource;}@end@implementation ViewController- (void) dealloc {    [_dSource release];    [_dModel release];    [_tableView_ release];    [super dealloc];}- (void) viewDidLoad {    [super viewDidLoad];    self.title = @"UITableView demo";        [[self view] setBackgroundColor:[UIColor whiteColor]];        _tableView_ = [[UITableView alloc] initWithFrame:self.view.bounds                                               style:UITableViewStyleGrouped];        //自动适应高度    _tableView_.autoresizingMask = UIViewAutoresizingFlexibleTopMargin |    UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleHeight;    [self.view addSubview:_tableView_];        _dModel = [[tableDataModel alloc] init];    _dSource = [[tableDataSource alloc] init];    _dSource.dModel = _dModel;    _tableView_.dataSource = _dSource;    _tableView_.delegate = self;}- (void) viewDidUnload {    [_dSource release];    [_dModel release];    [_tableView_ release];    [super viewDidUnload];}- (BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {    return YES;}@end//-----------------------------------------------------------------------------------------------------#pragma mark -#pragma mark AppDelegate@interface AppDelegate : UIResponder <UIApplicationDelegate>@property (strong, nonatomic) UIWindow *window;@property (strong, nonatomic) UIViewController *viewController;@end@implementation AppDelegate@synthesize window = _window;@synthesize viewController = _viewController;- (void) dealloc {    [_window release];    [_viewController release];        [super dealloc];}- (BOOL) application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    srand(time(NULL));        self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];        self.viewController = [[ViewController alloc] init];        UINavigationController *controller = [[UINavigationController alloc] initWithRootViewController:self.viewController];     self.window.rootViewController = controller;    [controller release];        [self.window makeKeyAndVisible];    return YES;}@endint main(int argc, char *argv[]){    @autoreleasepool {        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));    }}