我们之前学习了打飞机的游戏，但是我们可能觉得枯燥的画面很不舒服，现在我们就来学习进度条的加载和背景的滚动show
1.首先来看看loadingbar的动态加载
1）首先在哎loading.h文件中加入如下的属性
~~~
CCProgressTimer *progress;
float progressInterval;
~~~
2）。m文件的实现如下
~~~
-(id) init
{
if ( ( self = [ super init] ) )
{
winSize = [[CCDirector sharedDirector] winSize];
winCenter = ccp(winSize.width / 2, winSize.height / 2);
progress = [CCProgressTimer progressWithSprite:[CCSprite spriteWithFile:@"progressbar.png"]];
[progress setPercentage:0]; //设置bar的初始化为0
progress.scale = 0.5f; //缩小一半
progress.midpoint = ccp(0, 0.5); //进度条动画的起始位置，默认是图片的中点。如果想从头开始加载，必须改成（0，y）；
progress.barChangeRate = ccp(1, 0); //沿x轴方向加载，y轴不变
progress.type = kCCProgressTimerTypeBar;
[progress setPosition:winCenter];
[self addChild:progress];
CCLabelTTF *loadingText = [CCLabelTTF labelWithString:@"Loading..." fontName:@"Arial" fontSize:20];
loadingText.position = ccpAdd(winCenter, ccp(0,50));
[self addChild:loadingText];
}
return self;
}
~~~
3）更新progressUpdate方法
~~~
-(void) progressUpdate
{
if (--assetCount)
{
[progress setPercentage:(100.0f - (progressInterval *assetCount))];
//留着后面显示进度条用
}
else {
CCProgressFromTo *ac = [CCProgressFromTo actionWithDuration:0.5 from:progress.percentage to:100];
CCCallBlock *callBack = [CCCallBlock actionWithBlock:^(){
[self loadingComplete];
CCLOG(@"All done loading assets.");
}];
id action = [CCSequence actions:ac,callBack, nil];
[progress runAction:action];
}
}
~~~
2.使用CCFollow 和CCParallaxNode 动作添加滚动背景
1）Helloworld.h中加入如下的属性
~~~
//添加滚动背景
CCParallaxNode *_backgroundNode;
int _totalSeconds; //进行的游戏时长
~~~
2）.m中更新 updatebackground方法，我们相应的也导入了api：
~~~
#import "CCParallaxNode-Extras.h"
~~~
~~~
#pragma mark 背景的更新方法
- (void)updateBackground:(ccTime)dt
{
CCSprite *sprite;
int index = 0;
CCARRAY_FOREACH([_backgroundNode children],sprite)
{
CGPoint pt = [_backgroundNode convertToWorldSpace:sprite.position];
// CCLOG(@"pt.x = %f, pt.y = %f",pt.x, pt.y);
if ( pt.y <= -sprite.contentSize.height) {
CCLOG(@"===============");
[_backgroundNode incrementOffset:ccp(0,(sprite.contentSize.height - offset) * 2.0f) forChild:sprite];
}
index++;
}
}
~~~
3.init方法的修改
~~~
//16.添加连续滚动背景
_backgroundNode = [CCParallaxNode node];
[self addChild:_backgroundNode z:-1];
CGPoint ratio = ccp(1.0,0.5);
CCSprite *bgSprite1 = [CCSprite spriteWithSpriteFrameName:@"background_1.jpg"];
[[bgSprite1 texture] setAliasTexParameters];
bgSprite1.anchorPoint = ccp(0,0);
[_backgroundNode addChild:bgSprite1 z:1 parallaxRatio:ratio positionOffset:ccp(0,0)];
CCSprite *bgSprite2 = [CCSprite spriteWithSpriteFrameName:@"background_2.jpg"];
[[bgSprite2 texture] setAliasTexParameters];
bgSprite2.anchorPoint = ccp(0,0);
[_backgroundNode addChild:bgSprite2 z:1 parallaxRatio:ratio positionOffset:ccp(0,winSize.height - offset)];
//一定要注意，之前的背景设置要取消掉
}
return self;
}
~~~
4.onEnter方法的修改
~~~
- (void)onEnter
{
[super onEnter]; //一定要注意添加此方法，否则将停留在开始界面
CGSize winSize = [[CCDirector sharedDirector] winSize];
[CCMenuItemFont setFontSize:20];
[CCMenuItemFont setFontName:@"Arial"];
CCMenuItemFont *startItem = [CCMenuItemFont itemWithString:@"开始游戏" block:^(id sender)
{
_isGameStarted = YES;
CCMenuItem *item = (CCMenuItemFont*)sender;
item.visible = NO;
//6.spawn enemy after 1.0 sec
[self performSelector:@selector(spawnEnemy)
withObject:nil
afterDelay:1.0f];
//7.enable accelerometer
self.isAccelerometerEnabled = YES;
//9.enable touch
self.isTouchEnabled = YES;
//8.添加开始连续滚动背景的代码
const int MAX_LEVEL_WIDTH = 320;
const int MAX_LEVEL_HEIGHT = 480 * 100;
CCSprite *hiddenPlayerSprite = [CCSprite spriteWithSpriteFrameName:@"hero_1.png"];
hiddenPlayerSprite.position = ccp(winSize.width / 2, winSize.height / 2);
[self addChild:hiddenPlayerSprite z:-4 tag:1024];
_totalSeconds = 60;
id move = [CCMoveBy actionWithDuration:_totalSeconds position:ccp(0,MAX_LEVEL_HEIGHT)];
[hiddenPlayerSprite runAction:move];
//让背景开始滚动
[_backgroundNode runAction:[CCFollow actionWithTarget:hiddenPlayerSprite
worldBoundary:CGRectMake(0, 0, MAX_LEVEL_WIDTH, MAX_LEVEL_HEIGHT)]];
}];
startItem.position = ccp(winSize.width / 2, -winSize.height / 2);
_startGameMenu = [CCMenu menuWithItems:startItem, nil];
_startGameMenu.position = CGPointZero;
[self addChild:_startGameMenu];
//7 基本动作 从原来的位置移动到新的位置
id moveBy = [CCMoveBy actionWithDuration:1.0 position:ccp(0, winSize.height)]; //位置的移动
[_startGameMenu runAction:moveBy]; //开始移动
//8 和位置有关的基本动作
//1 CCActionManager
[[[CCDirector sharedDirector] actionManager ] pauseTarget:_startGameMenu];//暂停
[self schedule:@selector(resumeStartMenuAction:) interval:1.0]; //等待十秒之后才能开始移动
//2CCAction 抽象类，几乎所有的类都继承该类
//3.CCFiniteTimeAction 该类为有限时间动作，包含CCActionInstant 瞬时动作 和CCActionInterval 区间动作,他们包含了很多不同的动作
//4 CCRepaeatForever 无限重复的动作
//5跟随节点的动作CCFollow .可以替代Camera
//6 CCSpeed 更还节点动作的速度。
// 7CCOrbitCamera 继承与CCActionCamera 。使用球坐标系围绕屏幕中心旋转摄像机的视角
}
~~~
