cocos2d：菜单

-(id) init
{
 

  if((self=[super init])){
   
   
        //创建一个菜单项
        //这个菜单项完全使用精灵完成
        //与其说是菜单项,不如说是个按钮,它像按钮一样,提供普通状态,点中状态和禁用状态三种不同状态下需要显示的Sprite
        //并且,与UIButton类似的,点击事件通过对target的回调方法来实现

        CCSprite*spriteNormal= [CCSpritespriteWithFile:@"menuitemsprite.png"
                                                                             rect:CGRectMake(0,23*2,115,23)];
        CCSprite*spriteSelected =[CCSprite spriteWithFile:@"menuitemsprite.png"
                                                                               rect:CGRectMake(0,23*1,115,23)];
        CCSprite*spriteDisabled = [CCSprite spriteWithFile:@"menuitemsprite.png"
                                                                               rect:CGRectMake(0,23*0,115,23)];

        CCMenuItemSprite*item1 =[CCMenuItemSprite itemFromNormalSprite:spriteNormal
                                                                                              selectedSprite:spriteSelected
                                                                                             disabledSprite:spriteDisabled                                                                                                            target:self
                                                                                                           selector:@selector(menuCallback:)];
       

        //创建第二个菜单项
        //这个菜单项与第一个类似,不同之处是直接使用图片完称,比精灵更简洁

        CCMenuItem*item2=[CCMenuItemImage itemFromNormalImage:@"SendScoreButton.png"                                                                                        selectedImage:@"SendScoreButtonPressed.png"
                                                                                                    target:self
                                                                                                 selector:@selector(menuCallback2:)];


        //创建第三个菜单项
        //这个菜单项使用的是文本Label方式
        //值得一提的是,cocos2d提供了超级方便的自定义字库调用方法
        //如下方法中,设置好字库文件,并且以ascii字符排序顺序定义好字库的初始字符,就可以使用字库创建文本Label
        //以label方式创建的菜单项,会自动以点击放大作为菜单的操作效果来处理
        //如果要求护理特别特殊的点中效果,也可以继承CCMenuItem之后复写selected方法来实现

        CCLabelAtlas*labelAtlas=[CCLabelAtlas labelAtlasWithString:@"0123456789"
                                                                                    charMapFile:@"fps_images.png"
                                                                                       itemWidth:16 itemHeight:24
                                                                                  startCharMap:'.'];

        CCMenuItemLabel*item3=[CCMenuItemLabel itemWithLabel:labelAtlas                                                                                              target:self
                                                                                           selector:@selector(menuCallbackDisabled:)];
        item3.disabledColor=ccc3(32,32,64);
        item3.color=ccc3(200,200,255);
       

        //创建第四个菜单项,这是一个纯文本的菜单项

        CCMenuItem*item4=[CCMenuItemFontitemFromString:@"I toggle enable items"
                                                                                     target: self
                                                                                 selector:@selector(menuCallbackEnable:)];
       
        // 创建第五个菜单项
        //这也是一个使用文本配合字库文件创建的菜单项
        //不同的是,这里使用了fnt格式的字库描述文件.关于fnt格式的字库描述文件,我们今后再做详细研究
        CCBitmapFontAtlas*label =[CCBitmapFontAtlasbitmapFontAtlasWithStrin g:@"configuration"
                                                                                                                    fntFile:@"bitmapFontTest3.fnt"];
        CCMenuItemLabel*item5=[CCMenuItemLabel itemWithLabel:label                                                                                                                                                                            target:self
                                                                                           selector:@selector(menuCallbackConfig:)];
       
        // 创建第六个菜单项
        //这是一个最普通的文本菜单项,但是它搭配了一个动画效果.文本颜色,会一直变化
        CCMenuItemFont*item6=[CCMenuItemFontitemFromString:@"Quit"
                                                                                           target:self
                                                                                        selector:@selector(onQuit:)];
       
        id color_action=[CCTintByactionWithDuration:0.5f red:0 green:-255 blue:-255];
        id color_back=[color_actionreverse];
        id seq=[CCSequenceactions:color_action, color_back,nil];
        [item6runAction:[CCRepeatForever actionWithAction:seq]];

        //使用上述所有菜单项,构造菜单.
        CCMenu*menu=[CCMenumenuWithItems: item1, item2, item3, item4,item5, item6,nil];
        // 将菜单居中对齐
        [menualignItemsVertically];
       
       
        // 给菜单制作一个展现效果.
        //以下的算法,实现了菜单项交叉从左右飞入的效果,还是很酷滴.
        //关于cocos2d各种动画效果的使用,我觉得有必要单独开一篇学习笔记来学习,今天就先略过吧
        CGSize s=[[CCDirectorsharedDirector] winSize];
        int i=0;
        for( CCNode*childin [menu children]){
            CGPointdstPoint = child.position;
            int offset =s.width/2+ 50;
            if( i% 2 == 0)
                offset = -offset;
            child.position= ccp( dstPoint.x + offset,dstPoint.y);
            [child runAction:
              [CCEaseElasticOutactionWithAction:
              [CCMoveByactionWithDuration:2 position:ccp(dstPoint.x-offset,0)]
                                        period: 0.35f]
            ];
            i++;
        }

        //将第三个菜单项设为禁用,用于演示toggle菜单项的功能
        disabledItem=[item3 retain];
        disabledItem.isEnabled=NO;

        [selfaddChild: menu];
    }

    return self;
}

-(void)menuCallback:(id)sender
{
    //点击菜单项时,将激活Layer切换为另外一个,相当于进入2级菜单
    [(CCMultiplexLayer*)parent_switchTo:1];
}

-(void)menuCallbackEnable:(id)sender{
    //点击菜单项时,将某个菜单项禁用
    disabledItem.isEnabled= ~disabledItem.isEnabled;
}

-(void) onQuit: (id) sender
{
    //点击退出按钮的处理
    //在SDK3.0以上,苹果不允许应用程序自己执行退出.所以,应用程序其实不应该有自己的Quit菜单项.
    //http://developer.apple.com/iphone/library/qa/qa2008/qa1561.html
    [[CCDirectorsharedDirector] end]; 
   
    if([[UIApplicationsharedApplication]respondsToSelector:@selector(terminate)])
        [[UIApplication sharedApplication] performSelector:@selector(terminate)];
    else
        NSLog(@"YOU CAN'T TERMINATE YOURAPPLICATION PROGRAMATICALLY in SDK 3.0+");
}


//省略了其他代码.
@end

/第四个层演示了比较经典的设置界面.主要通过CCMenuItemToggle来实现
@implementation Layer4
-(id) init
{
 

  [super init];

    //创建一组开关菜单项,简单地说,就是on/of
    //这组菜单项由两部分组成

    //title是显示用的文字,不可以接受用户点击
    [CCMenuItemFont setFontName:@"AmericanTypewriter"];
    [CCMenuItemFont setFontSize:18];
    CCMenuItemFont*title1=[CCMenuItemFont itemFromString:@"Sound"];
    [title1 setIsEnabled:NO];

    //接下来的是可以接受用户点击的菜单项
    //这个菜单项提供了两个item,在call时,可以根据选中的index切换显示
    [CCMenuItemFont setFontName:@"MarkerFelt"];
    [CCMenuItemFont setFontSize:34];
    CCMenuItemToggle*item1=[CCMenuItemToggle itemWithTarget:self selector:@selector(menuCallback:) items:
                              [CCMenuItemFont itemFromString:@"On"],
                              [CCMenuItemFont itemFromString:@"Off"],
                              nil];
   
    //与上一个菜单项项相同,省略了两组共四个菜单项的代码

    //这个菜单项与上面的基本相同
    [CCMenuItemFont setFontName:@"AmericanTypewriter"];
    [CCMenuItemFont setFontSize:18];
    CCMenuItemFont*title4=[CCMenuItemFont itemFromString:@"Orientation"];
    [title4 setIsEnabled:NO];
    [CCMenuItemFont setFontName:@"MarkerFelt"];
    [CCMenuItemFont setFontSize:34];
    CCMenuItemToggle*item4=[CCMenuItemToggle itemWithTarget:self
                                                                                              selector:@selector(menuCallback:)
                                                                                                  items:   [CCMenuItemFontitemFromString:@"Off"],
                                                                                                        nil];

    //不同的是,这个菜单项使用了subItems的addObjectsFromArray方法来设置更多的可选项

    NSArray*more_items=[NSArray arrayWithObjects:
                                 [CCMenuItemFontitemFromString:@"33%"],
                                 [CCMenuItemFontitemFromString:@"66%"],
                                 [CCMenuItemFontitemFromString:@"100%"],
                                  nil];
    [item4.subItems addObjectsFromArray: more_items];
        item4.selectedIndex=2;//设置一个初选中的项目

    //设置第五组菜单项
    [CCMenuItemFont setFontName:@"MarkerFelt"];
    [CCMenuItemFont setFontSize:34];
   
    CCBitmapFontAtlas*label=[CCBitmapFontAtlasbitmapFontAtlasWithStrin g:@"go back"
                                                                                                               fntFile:@"bitmapFontTest3.fnt"];
    CCMenuItemLabel*back=[CCMenuItemLabel itemWithLabel:label
                                                                                          target:self
                                                                                        selector:@selector(backCallback:)];

    //构建菜单
    CCMenu*menu=[CCMenu menuWithItems:
                  title1,title2,
                  item1,item2,
                  title3,title4,
                  item3,item4,
                  back,nil];
   //共五组九个菜单项
    //对齐菜单项
    //这是一个比较独特的对齐方法,即让菜单项目以分列方式居中对齐.
    //第一组两列,会让前两个菜单项,将屏幕分为两列,在每列内居中.
    //最后设置为了列,使一个菜单项单独占据一行

    [menu alignItemsInColumns:
    [NSNumbernumberWithUnsignedInt:2],
    [NSNumbernumberWithUnsignedInt:2],
    [NSNumbernumberWithUnsignedInt:2],
    [NSNumbernumberWithUnsignedInt:2],
    [NSNumbernumberWithUnsignedInt:1],
    nil
    ];// 2 + 2 + 2 + 2 + 1 = 共9个
   
    [self addChild:menu]; 
    return self;
}

-(void)menuCallback:(id)sender
{
    //选中菜单项的回调,切换显示选中项目
    NSLog(@"selecteditem: %@ index:%d",[senderselectedItem],[sender selectedIndex]);
}