BeeFramework 系列二 UISignal篇上

BeeFramework中用的最多的就是UISignal了，这是一种通过Bee框架体系实现的可替代Delegate的信号传递方式。通过它可以简化使用Delegate时的各种烦索。
继续第一篇的例子，我们把ViewController继承自BeeUIBoard。

#import <UIKit/UIKit.h>
#import <BeeFramework/Bee.h>

@interface ViewController : BeeUIBoard

@end

重新运行看看是否UISignal能路由到ViewController上

未看到路由到ViewController上，实际上UISignla已经路过ViewController了。查看BeeUIButton文件，发现各种事件最后都是通过sendUISignla来转发。

- (void)didTouchUpInside
{
	if ( NO == [self testEvent:UIControlEventTouchUpInside] )
	{
		[self sendUISignal:BeeUIButton.TOUCH_UP_INSIDE];
	}
}

跟踪UIView+BeeUISignal，可以看出在sendUISignal时，新建了一个BeeUISignal，并把自身(UIView)设置为Signal的target。

- (BeeUISignal *)sendUISignal:(NSString *)name withObject:(NSObject *)object from:(id)source
{
	BeeUISignal * signal = [[[BeeUISignal alloc] init] autorelease];
	if ( signal )
	{
		NSString * selName = self.tagString.lowercaseString;
		selName = [selName stringByReplacingOccurrencesOfString:@"-" withString:@"_"];
//		selName = [selName stringByReplacingOccurrencesOfString:@":" withString:@"_"];
		
		signal.preSelector = selName;	// v0.3.0 new feature, signal binding
		signal.source = source ? source : self;
		signal.target = self;
		signal.name = name;		
		signal.object = object;
		[signal send];
	}
	return signal;
}

跟踪BeeUISignal，发现其路由的核心在routes方法上，通过判断target是否实现规则的方法名，来决定最终调用的目标的View或ViewController，以此例为例，方法名可为handleUISignal_BeeUIButton_TOUCH_UP_INSIDE:或handleUISignal_BeeUIButton，如未找到该方法，则为继续判断是否响应以BeeUIButton父类命名的规则方法handleUIButton:，如此循环直至顶层类NSObject的规则方法handleNSObject:，最后实在未找到，则调用BeeUIButton的handleUISignal：方法。该方法在UIView+BeeUISignal中的实现：

- (void)handleUISignal:(BeeUISignal *)signal
{
	if ( self.superview )
	{
		[signal forward:self.superview];
	}
	else
	{
		signal.reach = YES;

	#if defined(__BEE_DEVELOPMENT__) && __BEE_DEVELOPMENT__
		CC( @"[%@] > %@", signal.name, signal.callPath );
	#endif	// #if defined(__BEE_DEVELOPMENT__) && __BEE_DEVELOPMENT__
	}
}

即把当前View的上一层再进行signal路由。

这里会发现signal未传到上一层的View进行路由。这里需要加下补丁，参考 https://github.com/ilikeido/BeeFramework/commit/59dc2e4c29ea1a890dafe47bf526ecf57b402c95
为Bee_UIBoard添加代码

-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        if ( nil == __allBoards )
		{
			__allBoards = [[NSMutableArray nonRetainingArray] retain];
		}
        
		[__allBoards insertObject:self atIndex:0];
		
		_lastSleep = [NSDate timeIntervalSinceReferenceDate];
		_lastWeekup = [NSDate timeIntervalSinceReferenceDate];
		
		_zoomed = NO;
		_zoomRect = CGRectZero;
        
		_firstEnter = YES;
		_presenting = NO;
		_viewBuilt = NO;
		_dataLoaded = NO;
		_state = BeeUIBoard.STATE_DEACTIVATED;
		
		_createDate = [[NSDate date] retain];
		
		_modalAnimationType = BeeUIBoard.ANIMATION_TYPE_ALPHA;
		
		_allowedPortrait = YES;
		_allowedLandscape = NO;
        
#if defined(__BEE_DEVELOPMENT__) && __BEE_DEVELOPMENT__
		_createSeq = __createSeed++;
		_signalSeq = 0;
		_signals = [[NSMutableArray alloc] init];
        
		_callstack = [[NSMutableArray alloc] init];
		[_callstack addObjectsFromArray:[BeeRuntime callstack:16]];
#endif	// #if defined(__BEE_DEVELOPMENT__) && __BEE_DEVELOPMENT__
		
		[self load];
	}
	return self;
}

修改UIView+BeeExtension.m 的ViewController方法

- (UIViewController *)viewController
{
	if ( nil == self.superview )
		return nil;
	
	id nextResponder = [self nextResponder];
	if ( [nextResponder isKindOfClass:[UIViewController class]] )
	{
		return (UIViewController *)nextResponder;
	}
	else
	{
		return nil;
	}
}

好了，了解了signal的路由原理，现在在ViewController中添加

-(void)handleUISignal_BeeUIButton:(BeeUISignal *)signal{
    if ([signal is:BeeUIButton.TOUCH_UP_INSIDE]) {
        CC(@"111");
    }
    
}

OK，重新运行。

现在有响应了,:-)。为了测试下signal是否是自底向上传递的。再来做个例子，打开ViewController.h添加个MyView

//
//  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 MyView : UIView

@end

@interface ViewController : BeeUIBoard

@end

修改ViewController.m

//
//  ViewController.m
//  BeeFrameWorkTest
//
//  Created by he songhang on 13-6-3.
//  Copyright (c) 2013年 he songhang. All rights reserved.
//

#import "ViewController.h"

@implementation MyView

-(void)handleUISignal_BeeUIButton:(BeeUISignal *)signal{
    if ([signal is:BeeUIButton.TOUCH_UP_INSIDE]) {
        CC(@"MyView response");
    }
}

@end

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(void)handleUISignal_BeeUIButton:(BeeUISignal *)signal{
    if ([signal is:BeeUIButton.TOUCH_UP_INSIDE]) {
        CC(@"ViewController response");
    }
}

@end

打开ViewController.xib，添加一个MyView，并把Button继承自BeeUIButton放到MyView里

重新运行，
可以看到点击Button，handleUISignal_BeeUIButton响应的是MyView，因为路由的路径是BeeUIButton->MyView.如果想让信号继续传递呢？对了添加[super handleUISignal:signal];

@implementation MyView

-(void)handleUISignal_BeeUIButton:(BeeUISignal *)signal{
    if ([signal is:BeeUIButton.TOUCH_UP_INSIDE]) {
        CC(@"MyView response");
    }
    [super handleUISignal:signal];
}

@end

现在的信号路由路径为
BeeUIButton->MyView->UIViewController

本文代码下载: https://github.com/ilikeido/BeeFrameworkTest/tree/master/lesson2