参考：http://www.tuicool.com/articles/vQR7B3

1、在ios/AppController.h 添加这两个协议 UIImagePickerControllerDelegate,UINavigationControllerDelegate

2、编写下面代码

//显示照相机
+(void) showImagePicker:(NSDictionary *)info {callBackId = [[info objectForKey:@"listener"] intValue];UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];imagePicker.delegate = self;imagePicker.allowsEditing = true;imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;[[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:imagePicker animated:YES completion:nil];
}//选取照片完成
+(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{NSLog(@"%@",info);if ([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:@"public.image"]) {UIImage *img = [info objectForKey:UIImagePickerControllerEditedImage];[self saveImage:img];} else {}[picker dismissViewControllerAnimated:YES completion:nil];
}// 取消选择
+(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{[picker dismissViewControllerAnimated:YES completion:nil];
}//保存图片
+(void)saveImage:(UIImage *)img
{BOOL success;NSFileManager *fileManager = [NSFileManager defaultManager];NSError *error;NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);NSString *documentsDirectory = [paths objectAtIndex:0];NSString *imgFilePath = [documentsDirectory stringByAppendingPathComponent:@"headPhoto.png"];success = [fileManager fileExistsAtPath:imgFilePath];std::string newImgPath = cocos2d::CCFileUtils::getInstance()->getWritablePath() + "/headPhoto.png";if (success) {success = [fileManager removeItemAtPath:[NSString stringWithFormat:@"%s",newImgPath.c_str()] error:&error];NSLog(@"success 2 %d",success);}// 更改尺寸UIImage * smallImage = [self thumbnailWithImageWithoutScale:img size:CGSizeMake(80, 80)];[UIImageJPEGRepresentation(smallImage, 1.0f) writeToFile:[NSString stringWithFormat:@"%s",newImgPath.c_str()] atomically:YES];// 新的照片地址回调给luacocos2d::LuaObjcBridge::pushLuaFunctionById(callBackId);
//    cocos2d::LuaObjcBridge::getStack()->pushString([imgFilePath cStringUsingEncoding:NSUTF8StringEncoding]);cocos2d::LuaObjcBridge::getStack()->pushString(newImgPath.c_str());cocos2d::LuaObjcBridge::getStack()->executeFunction(1);cocos2d::LuaObjcBridge::releaseLuaFunctionById(callBackId);}
// 实现缩略图
+(UIImage *) thumbnailWithImageWithoutScale:(UIImage *)img size:(CGSize)asize
{UIImage * newImg;if (nil == img) {newImg = nil;}else{CGSize oldsize = img.size;CGRect rect;if(asize.width/asize.height > oldsize.width/oldsize.height){rect.size.width = asize.height * oldsize.width / oldsize.height;rect.size.height = asize.width;rect.origin.x = (asize.width - rect.size.width) / 2;rect.origin.y = 0;}else{rect.size.width = asize.width;rect.size.height = asize.width * oldsize.height / oldsize.width;rect.origin.x = 0;rect.origin.y = (asize.height - rect.size.height) / 2;}UIGraphicsBeginImageContext(asize);CGContextRef content = UIGraphicsGetCurrentContext();CGContextSetFillColorWithColor(content, [[UIColor clearColor] CGColor]);UIRectFill(CGRectMake(0, 0, asize.width, asize.height));[img drawInRect:rect];newImg = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();}return newImg;
}

3、在lua里面实现

if device.platform == "ios" thenlocal function callBack( imgFileName )//重新加载文理cc.Director:getInstance():getTextureCache():reloadTexture(imgFileName)display.newSprite(imgFileName):addTo(self):pos(display.cx,display.cy)endluaoc.callStaticMethod("AppController","showImagePicker",{listener = callBack})
end