在相机视图上叠加一个框架，然后保存并使用生成的照片（捕获的内容和叠加框架）

Question

我希望我的应用程序中有一个功能，

可以让您为自己或其他有名气的人拍一张照片，例如“通缉：”。

- 然后用户拍摄照片，叠加层和照片将合并为一张

- 生成的图像可在代码中使用。

任何想法从哪里/如何开始。任何教程等。

干杯

Answer 1

它可能会有点棘手，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图像有点不同，但基本思想如下：

- (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();