Quick-cocos2d-x3.3 ios實現頭像選取

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

一、在ios/AppController.h 添加這兩個協議 UIImagePickerControllerDelegate,UINavigationControllerDelegate

二、編寫下面代碼

//顯示照相機
+(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];
}

//選取照片完成
+(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];
}

// 取消選擇
+(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissViewControllerAnimated:YES completion:nil];
}

//保存圖片
+(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];
    // 新的照片地址回調給lua
    cocos2d::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);
    
}
// 實現縮略圖
+(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;
}

三、在lua裏面實現

if device.platform == "ios" then
	local function callBack( imgFileName )
	        //從新加載文理
		cc.Director:getInstance():getTextureCache():reloadTexture(imgFileName)
		display.newSprite(imgFileName):addTo(self):pos(display.cx,display.cy)
	end
	luaoc.callStaticMethod("AppController","showImagePicker",{listener = callBack})
end