在相机视图上覆盖一个框架，然后保存并使用生成的照片（捕获的内容和覆盖框架）

Question

我想在我的应用中有一个功能

- 你拍摄自己或其他有名气的照片，例如“通缉：”覆盖在上面。

- 然后用户将拍摄照片，并将叠加和照片组合成一个

- 结果图像可用于代码。

任何想法，如何开始/如何开始。任何教程等。

干杯

Answer 1

它可能会变得有点棘手，处理应用于图像预览的变换，这使得它看起来与相机提供的变换略有不同，但这是基本的想法：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

UIImage *img = [info objectForKey:UIImagePickerControllerOriginalImage];

// Here we are throwing away lots of image resolution -- but since our art is built for the 320 x 480 screen
// and we are worried about uploading bandwidth, crunching the image down from ~1600 x 2400 to 320 x 480 just makes sense
// note that the proportion is a little different, so the picture is slightly stretched in the y-axis, but this is augmented reality, so we like that

// note that hardwareScreenSize has to be determined by checking UIDeviceHardware

UIGraphicsBeginImageContext(hardwareScreenSize);


[img drawInRect:CGRectMake(0, ((hardwareScreenSize.height - hardwareScreenSize.height ) / 2), hardwareScreenSize.width, hardwareScreenSize.height)];


// this scales overlayImage to fit ontop of camera image
[(UIImage *)overlayImage drawInRect:CGRectMake(0, 0, hardwareScreenSize.width, hardwareScreenSize.height)];

UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
[finalImage retain];

UIGraphicsEndImageContext();