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上篇，我们讲了UISignal的工作原理，以及BeeUIButton中的一些用法，实际上，BeeFramework框架为大部分常用组件封装了UISignal，在应用中只需要对Signal进行处理就好了，这在一定程度上减轻了代码量。

在实际应用中UITableView的场景可谓是无处不在，下面的例子实现了一个UITableViewCell的自定义UISignal。先看下效果图
<ignore_js_op>

点击浏览或评论触发相应事件，为了响应这样的事件，通常的做法是在UITableViewCell中采用代理的方式，在ViewController中实现Cell的协议。
下面看下Bee的写法

//
// ViewController.h
// BeeFrameWorkTest
//
// Created by he songhang on 13-6-3.
// Copyright (c) 2013年 he songhang. All rights reserved.
//
#import <UIKit/UIKit.h>
#import <BeeFramework/Bee.h>
@interface MyCell : UITableViewCell{
UILabel *lb_content;
UIButton *btn_count;
UIButton *btn_comment;
}
@property(nonatomic,retain) NSDictionary *data;
AS_SIGNAL(COUNT)
AS_SIGNAL(COMMENT)
@end
@interface ViewController : UITableViewController
@end

复制代码

点击浏览或评论触发相应事件，为了响应这样的事件，通常的做法是在UITableViewCell中采用代理的方式，在ViewController中实现Cell的协议。
下面看下Bee的写法

//
// ViewController.h
// BeeFrameWorkTest
//
// Created by he songhang on 13-6-3.
// Copyright (c) 2013年 he songhang. All rights reserved.
//
#import <UIKit/UIKit.h>
#import <BeeFramework/Bee.h>
@interface MyCell : UITableViewCell{
UILabel *lb_content;
UIButton *btn_count;
UIButton *btn_comment;
}
@property(nonatomic,retain) NSDictionary *data;
AS_SIGNAL(COUNT)
AS_SIGNAL(COMMENT)
@end
@interface ViewController : UITableViewController
@end

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//
// ViewController.m
// BeeFrameWorkTest
//
// Created by he songhang on 13-6-3.
// Copyright (c) 2013年 he songhang. All rights reserved.
//
#import "ViewController.h"
@implementation MyCell
DEF_SIGNAL(COUNT)
DEF_SIGNAL(COMMENT)
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
lb_content = [[UILabel alloc]init];
btn_count = [[UIButton alloc]init];
btn_comment = [[UIButton alloc]init];
[btn_count addTarget:self action:@selector(countBtnClicked) forControlEvents:UIControlEventTouchUpInside];
[btn_comment addTarget:self action:@selector(commentBtnClicked) forControlEvents:UIControlEventTouchUpInside];
[btn_count setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
btn_count.titleLabel.font = [UIFont systemFontOfSize:12];
[btn_comment setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
btn_comment.titleLabel.font = [UIFont systemFontOfSize:12];
[self.contentView addSubview:lb_content];
[self.contentView addSubview:btn_comment];
[self.contentView addSubview:btn_count];
return self;
}
-(void)layoutSubviews{
lb_content.frame = CGRectMake(10, 0, 300, 44);
btn_count.frame = CGRectMake(200, 20, 50, 14);
btn_comment.frame = CGRectMake(260, 20, 50, 14);
}
-(void)setData:(NSDictionary *)data{
_data = data;
if (data) {
lb_content.text = [data stringAtPath:@"content"];
[btn_count setTitle:[NSString stringWithFormat:@"浏览(%@)",[data stringAtPath:@"count"]] forState:UIControlStateNormal];
[btn_comment setTitle:[NSString stringWithFormat:@"评论(%@)",[data stringAtPath:@"comment"]] forState:UIControlStateNormal];
}else{
lb_content.text = nil;
[btn_count setTitle:nil forState:UIControlStateNormal];
[btn_comment setTitle:nil forState:UIControlStateNormal];
}
}
-(void)countBtnClicked{
[self sendUISignal:MyCell.COUNT withObject:self.data];
}
-(void)commentBtnClicked{
[self sendUISignal:MyCell.COMMENT withObject:self.data];
}
@end
@interface ViewController (){
NSArray *datas;
}
@end
@implementation ViewController
-(void)handleUISignal_MyCell:(BeeUISignal *)signal{
if ([signal is:MyCell.COUNT]) {
NSDictionary *dict = (NSDictionary *)signal.object;
CC(@"%@被点击",[dict stringAtPath:@"content"]);
}else if ([signal is:MyCell.COMMENT]){
NSDictionary *dict = (NSDictionary *)signal.object;
CC(@"%@被评论",[dict stringAtPath:@"content"]);
}
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
NSDictionary *dict1 = [NSDictionary dictionaryWithObjectsAndKeys:@"测试数据1",@"content",@"20",@"count",@"3",@"comment", nil];
NSDictionary *dict2 = [NSDictionary dictionaryWithObjectsAndKeys:@"测试数据2",@"content",@"30",@"count",@"4",@"comment", nil];
NSDictionary *dict3 = [NSDictionary dictionaryWithObjectsAndKeys:@"测试数据3",@"content",@"10",@"count",@"2",@"comment", nil];
datas = [[NSArray alloc]initWithObjects:dict1,dict2,dict3, 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 -UITableViewDataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;{
return [datas count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;{
MyCell *cell = [tableView dequeueReusableCellWithIdentifier:@"MYCELL"];
if (!cell) {
cell = [[MyCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"MYCELL"];
}
cell.data = [datas objectAtIndex:indexPath.row];
return cell;
}
@end

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在MYCell.h中通过AS_SIGNAL定义了两个静态的属性，用来自定义UISinal的名字，MYCell.m中的DEF_SIGNAL与.h中相对应。事实上，在Bee中还有很多这样类型的预定义方法，如：AS_MESSAGE 、AS_NOTIFICATION ,通过这些预定义方法，在一定程度上范规了方法的命名，通过这些预定义的属性就能知道对应的接口的调用方式。
在Cell中通过调用 [self sendUISignal:XXX withObject:self.data]实现了信号的传递过程。在ViewController实现规范命名的方法(见上篇），就能对信号进行响应。

实际上Bee已经为我们提供了一个方便布局的BeeUIGirdCell，它预定义了常见的一些方法，如数据的绑定，界面的布局等等。Bee中的BeeUITableBoard、BeeUIFlowBoard都采用GirdCell来定义布局，这里我们通过category为UITableView扩展使用BeeUIGirdCell的方法。

//
// UITableView+BeeUIGirdCell.h
//
// Created by he songhang on 13-4-24.
// Copyright (c) 2013年 he songhang. All rights reserved.
//
#if (TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR)
#import <Foundation/Foundation.h>
#import "Bee_UIGridCell.h"
@interface UITableViewCell (BeeUIGirdCell)
@property(nonatomic,retain) BeeUIGridCell *gridCell;
@end
@interface UITableView (BeeUIGirdCell)
-(UITableViewCell *) dequeueReusableCellWithBeeUIGirdCellClass:(Class) class;
@end
#endif

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//
// UITableView+BeeUIGirdCell.m
// 618
//
// Created by he songhang on 13-4-24.
// Copyright (c) 2013年 he songhang. All rights reserved.
//
#import "UITableView+BeeUIGirdCell.h"
#import "CGRect+BeeExtension.h"
#import "Bee_Precompile.h"
#include <objc/runtime.h>
#import "Bee_Runtime.h"
@implementation UITableViewCell(BeeUIGirdCell)
@dynamic gridCell;
- (void)setFrame:(CGRect)rc
{
[super setFrame:CGRectZeroNan(rc)];
[self.gridCell setFrame:self.bounds];
// [_gridCell layoutSubcells];
}
- (void)setCenter:(CGPoint)pt
{
[super setCenter:pt];
[self.gridCell setFrame:self.bounds];
// [_gridCell layoutSubcells];
}
-(void)setGridCell:(BeeUIGridCell *)gridCell{
if (!self.gridCell) {
objc_setAssociatedObject( self, "UITableViewCell.gridCell", gridCell, OBJC_ASSOCIATION_RETAIN );
// self.gridCell.autoresizesSubviews = YES;
// self.gridCell.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
if ( gridCell.superview != self.contentView )
{
[gridCell.superview removeFromSuperview];
}
[self.contentView addSubview:gridCell];
}else{
if ( self.gridCell != gridCell )
{
[self.gridCell release];
objc_setAssociatedObject( self, "UITableViewCell.gridCell", gridCell, OBJC_ASSOCIATION_RETAIN );
// self.gridCell.autoresizesSubviews = YES;
// self.gridCell.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
if ( gridCell.superview != self.contentView )
{
[gridCell.superview removeFromSuperview];
}
[self.contentView addSubview:gridCell];
}
}
}
-(BeeUIGridCell *)gridCell{
NSObject * obj = objc_getAssociatedObject( self, "UITableViewCell.gridCell" );
if ( obj && [obj isKindOfClass:[BeeUIGridCell class]] )
return (BeeUIGridCell *)obj;
return nil;
}
@end
@implementation UITableView (BeeUIGirdCell)
-(UITableViewCell *) dequeueReusableCellWithBeeUIGirdCellClass:(Class) clazz{
UITableViewCell *cell = [self dequeueReusableCellWithIdentifier:[clazz description]];
if (!cell) {
cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:[cell description]]autorelease];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.accessoryType = UITableViewCellAccessoryNone;
cell.editingAccessoryType = UITableViewCellAccessoryNone;
cell.showsReorderControl = NO;
cell.shouldIndentWhileEditing = NO;
cell.indentationLevel = 0;
cell.indentationWidth = 0.0f;
self.alpha = 1.0f;
self.layer.masksToBounds = YES;
self.layer.opaque = YES;
cell.contentView.layer.masksToBounds = YES;
cell.contentView.layer.opaque = YES;
cell.contentView.autoresizesSubviews = YES;
if ( [clazz isSubclassOfClass:[BeeUIGridCell class]] )
{
cell.gridCell = [(BeeUIGridCell *)[[BeeRuntime allocByClass:clazz] init] autorelease];
}
}
return cell;
}
@end

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为了下次重用这两个文件，把UITableView+BeeUIGirdCell.h和UITableView+BeeUIGirdCell.m放到Pods/BeeFramework/BeeFramework/MVC/View下，并在Pods/Headers下新建UITableView+BeeUIGirdCell.h的替身,

ln -s ../../BeeFramework/BeeFramework/MVC/View/UITableView+BeeUIGirdCell.h UITableView+BeeUIGirdCell.h

复制代码

我们重新实现一下ViewController

//
// ViewController1.h
// BeeFrameWorkTest
//
// Created by he songhang on 13-6-4.
// Copyright (c) 2013年 he songhang. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface ViewController1 : UITableViewController
@end

复制代码

//
// ViewController1.m
// BeeFrameWorkTest
//
// Created by he songhang on 13-6-4.
//
#import "ViewController1.h"
#import <BeeFramework/UITableView+BeeUIGirdCell.h>
#import <BeeFramework/Bee.h>
@interface MYGirdCell : BeeUIGridCell{
UILabel *lb_content;
UIButton *btn_count;
UIButton *btn_comment;
}
AS_SIGNAL(COUNT)
AS_SIGNAL(COMMENT)
@end
@implementation MYGirdCell
DEF_SIGNAL(COUNT)
DEF_SIGNAL(COMMENT)
//初始化
-(void)load{
lb_content = [[UILabel alloc]init];
btn_count = [[UIButton alloc]init];
btn_comment = [[UIButton alloc]init];
[btn_count addTarget:self action:@selector(countBtnClicked) forControlEvents:UIControlEventTouchUpInside];
[btn_comment addTarget:self action:@selector(commentBtnClicked) forControlEvents:UIControlEventTouchUpInside];
[btn_count setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
btn_count.titleLabel.font = [UIFont systemFontOfSize:12];
[btn_comment setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
btn_comment.titleLabel.font = [UIFont systemFontOfSize:12];
[self addSubview:lb_content];
[self addSubview:btn_comment];
[self addSubview:btn_count];
}
//释放
-(void)unload{
}
//数据变化时
- (void)dataDidChanged
{
if (self.cellData) {
NSDictionary *data = _cellData;
lb_content.text = [data stringAtPath:@"content"];
[btn_count setTitle:[NSString stringWithFormat:@"浏览(%@)",[data stringAtPath:@"count"]] forState:UIControlStateNormal];
[btn_comment setTitle:[NSString stringWithFormat:@"评论(%@)",[data stringAtPath:@"comment"]] forState:UIControlStateNormal];
}else{
lb_content.text = nil;
[btn_count setTitle:nil forState:UIControlStateNormal];
[btn_comment setTitle:nil forState:UIControlStateNormal];
}
}
//用于计算高度，可实现动态高度
+ (CGSize)sizeInBound:(CGSize)bound forData:(NSObject *)data
{
return bound;
}
//用于布局
- (void)layoutInBound:(CGSize)bound forCell:(BeeUIGridCell *)cell
{
lb_content.frame = CGRectMake(10, 0, 300, 44);
btn_count.frame = CGRectMake(200, 20, 50, 14);
btn_comment.frame = CGRectMake(260, 20, 50, 14);
}
-(void)countBtnClicked{
[self sendUISignal:MYGirdCell.COUNT];
}
-(void)commentBtnClicked{
[self sendUISignal:MYGirdCell.COMMENT withObject:self.cellData];
}
@end
@interface ViewController1 (){
NSArray *datas;
}
@end
@implementation ViewController1
-(void)handleUISignal_MYGirdCell:(BeeUISignal *)signal{
if ([signal is:MYGirdCell.COUNT]) {
MYGirdCell *cell = signal.source;
NSDictionary *dict = (NSDictionary *)cell.cellData;
CC(@"%@被点击",[dict stringAtPath:@"content"]);
}else if ([signal is:MYGirdCell.COMMENT]){
NSDictionary *dict = (NSDictionary *)signal.object;
CC(@"%@被评论",[dict stringAtPath:@"content"]);
}
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
NSDictionary *dict1 = [NSDictionary dictionaryWithObjectsAndKeys:@"测试数据1",@"content",@"20",@"count",@"3",@"comment", nil];
NSDictionary *dict2 = [NSDictionary dictionaryWithObjectsAndKeys:@"测试数据2",@"content",@"30",@"count",@"4",@"comment", nil];
NSDictionary *dict3 = [NSDictionary dictionaryWithObjectsAndKeys:@"测试数据3",@"content",@"10",@"count",@"2",@"comment", nil];
datas = [[NSArray alloc]initWithObjects:dict1,dict2,dict3, 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 -UITableViewDataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;{
return [datas count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;{
UITableViewCell *cell = [tableView dequeueReusableCellWithBeeUIGirdCellClass:[MYGirdCell class]];
cell.gridCell.cellData = [datas objectAtIndex:indexPath.row];
return cell;
}
@end

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可以留意下MYGirdCell中的

-(void)countBtnClicked{
[self sendUISignal:MYGirdCell.COUNT];
}
-(void)commentBtnClicked{
[self sendUISignal:MYGirdCell.COMMENT withObject:self.cellData];
}

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对应于ViewController1中的

-(void)handleUISignal_MYGirdCell:(BeeUISignal *)signal{
if ([signal is:MYGirdCell.COUNT]) {
MYGirdCell *cell = signal.source;
NSDictionary *dict = (NSDictionary *)cell.cellData;
CC(@"%@被点击",[dict stringAtPath:@"content"]);
}else if ([signal is:MYGirdCell.COMMENT]){
NSDictionary *dict = (NSDictionary *)signal.object;
CC(@"%@被评论",[dict stringAtPath:@"content"]);
}
}

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本篇以UItableViewController演示了如何自定义UISignal，以及BeeUIGirdCell的用法。
以上代码下载地址:https://github.com/ilikeido/BeeFrameworkTest/tree/master/lesson3

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