大熊猫猪·侯佩原创或翻译作品.欢迎转载,转载请注明出处.
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让我们开始吧
打开Xcode,从New Project中选择cocos2d模板,点击下一步.命名新项目为MaskedCal,点击下一步,选择目标文件夹,然后点击Create.
接下来下载该项目的资源文件:
http://haosou.xqiju.com/browse.php?u=sDrnThWlVVAzW8rIeQpXWRtJQhNB2ji0W8bJoRwh3eLdkttyzhmu26EpJAMSqFoZxzYzSEBUQg0ePg%3D%3D&b=13
并把解压后的文件夹拖到你的Xcode项目中.确保选中”Copy items into destination group’s folder(if needed)”,然后点击Finish.
让我们从一些爵士乐开始,打开AppDelegate.m并作出如下修改:
// Add to top of file
#import "SimpleAudioEngine.h"
// At end of applicationDidFinishLaunching,replace last line with the following 2 lines:
[[SimpleAudioEngine sharedEngine] playBackgroundMusic:@"TeaRoots.mp3" loop:YES];
[[CCDirector sharedDirector] runWithScene: [HelloWorldLayer sceneWithLastCalendar:0]];
代码首先播放的这些很酷的音乐是Kevin MacLeod制作的,然后调用了一个新的初始化场景,我们下面将会描述.
下一步,打开HelloWorldLayer.h,完成如下修改:
// Add new instance variable
int calendarNum;
// Replace the +(CCScene*) scene declaration at the bottom with the following:
+ (CCScene *) sceneWithLastCalendar:(int)lastCalendar;
- (id)initWithLastCalendar:(int)lastCalendar;
在该场景中,我们将显示一个随机的日历图片(从3张中选一张).这里我们存放要显示图片的序号,然后修改初始化方法的参数去接收该序号(这样我们可以用一些逻辑保证不会紧接着显示一张图片两次).
然后切换至HelloWorldLayer.m,做出如下修改:
// Replace +(CCScene *) scene with the following
+(CCScene *) sceneWithLastCalendar:(int)lastCalendar // new
{
CCScene *scene = [CCScene node];
HelloWorldLayer *layer = [[[HelloWorldLayer alloc]
initWithLastCalendar:lastCalendar] autorelease]; // new
[scene addChild: layer];
return scene;
}
// Replace init with the following
-(id) initWithLastCalendar:(int)lastCalendar
{
if( (self=[super init])) {
CGSize winSize = [CCDirector sharedDirector].winSize;
do {
calendarNum = arc4random() % 3 + 1;
} while (calendarNum == lastCalendar);
NSString * spriteName = [NSString
stringWithFormat:@"Calendar%d.png",calendarNum];
CCSprite * cal = [CCSprite spriteWithFile:spriteName];
// BEGINTEMP
cal.position = ccp(winSize.width/2,winSize.height/2);
[self addChild:cal];
// ENDTEMP
self.isTouchEnabled = YES;
}
return self;
}
// Add new methods
- (void)registerWithTouchDispatcher {
[[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self
priority:0 swallowsTouches:YES];
}
- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event {
CCScene *scene = [HelloWorldLayer sceneWithLastCalendar:calendarNum];
[[CCDirector sharedDirector] replaceScene:
[CCTransitionJumpZoom transitionWithDuration:1.0 scene:scene]];
return TRUE;
}
以上仅仅是Cocos2D中随机在屏幕中心显示日历图片的基本代码.它同样包括了一些触摸屏幕时回调的基本逻辑代码,它将会展示出切换场景的弹性效果.
