cocos2d-x中调用ios图库的方法如何设置

http://www.cnblogs.com/hanhongmin/p/3498102.html
我们在PickerDelegate中能够拿到UIImage拿到后转变成cocos2dx可用的格式，回调HelloWord的方法再干一些事，比如显示出来。

关于把方法当参数传进来之类的我一概不懂，所以在PickerDelegate中直接调HelloWorld，所以.m改成.mm以实现混编。

我们先说UIImage的数据转换

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- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    //CCLog("selected");
    //处理数据
    UIImage* image = [info valueForKey:UIImagePickerControllerOriginalImage];
    
    CGImageRef imageRef = [image CGImage];
    NSUInteger width = CGImageGetWidth(imageRef);
    NSUInteger height = CGImageGetHeight(imageRef);
    CCLog("%i,%i",width,height);
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    unsigned char* rawData = (unsigned char*) calloc(height * width * 4, sizeof(unsigned char));
    NSUInteger bytesPerPixel = 4;
    NSUInteger bytesPerRow = bytesPerPixel * width;
    NSUInteger bitsPerComponent = 8;
    CGContextRef context = CGBitmapContextCreate(rawData, width, height, bitsPerComponent, bytesPerRow, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
    CGColorSpaceRelease(colorSpace);
    CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);
    CGContextRelease(context);
    cocos2d::CCTexture2D *pickedImage = new cocos2d::CCTexture2D();
    pickedImage->initWithData(rawData, cocos2d::kCCTexture2DPixelFormat_RGBA8888, width, height, cocos2d::CCSizeMake(width, height));
    CCLOG("%f,%f",pickedImage->getContentSize().width,pickedImage->getContentSize().height);
    
    [picker dismissModalViewControllerAnimated: YES];
    [picker release];
}
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以上，我们已经把图片数据转换到了CCTexture2D，至于为何这么转，我也是搜来哒~注意引入响应头文件，这个以后就不说了。

HelloWorld声明和定义接口，接收CCTexture2D并干一些我们想干的事。

.h

void pickedPhoto(CCTexture2D* texture);
.cpp

void HelloWorld::pickedPhoto(CCTexture2D* texture){
    CCSprite* sprite = CCSprite::createWithTexture(texture);
    this->addChild(sprite);
}

CCScene* HelloWorld::scene()
{
    CCScene *scene = CCScene::create();
    HelloWorld *layer = HelloWorld::create();
    layer->setTag(1);
    scene->addChild(layer);

    return scene;
}

UIImage+fixOrientation.h文件

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1 //
2 // UIImage+fixOrientation.h
3 // OpenCamera
4 //
5 // Created by HanHongmin on 13-12-30.
6 //
7 //
8
9 #import
10
11 @interface UIImage (fixOrientation)
12 -(UIImage*) fixOrientation;
13 @end
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UIImage+fixOrientation.m文件

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1 //
2 // UIImage+fixOrientation.m
3 // OpenCamera
4 //
5 // Created by HanHongmin on 13-12-30.
6 //
7 //
8
9 #import "UIImage+fixOrientation.h"
10
11 @implementation UIImage (fixOrientation)
12 - (UIImage *)fixOrientation {
13 if (self.imageOrientation == UIImageOrientationUp) return self;
14
15 UIGraphicsBeginImageContextWithOptions(self.size, NO, self.scale);
16 [self drawInRect:(CGRect){0, 0, self.size}];
17 UIImage *normalizedImage = UIGraphicsGetImageFromCurrentImageContext();
18 UIGraphicsEndImageContext();
19 return normalizedImage;
20 }
21 @end
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以上有啥不明白的，自己搜去吧我也说不明白。这个东西用了之后，据说手机内存会突然增大大概40-50M，求良药啊

在PickerDelegate中引用上面的头文件，得到UIImage后调一下。

UIImage* image = [info valueForKey:UIImagePickerControllerOriginalImage];
image = [image fixOrientation];

试试~~

图片拾取后发现只显示了一部分，

自行处理一下吧。我在项目中用的时候，sprite是早就创建好的，大小是整个屏幕，只是获得Texture的时候更换到了sprite中，没啥问题的。