How to use the Key Value Observer in Swift?
For my purpose, I set up AVFoundation to take photos, and I want to make sure the exposure and white balance (Exposure Adjustment, WhiteBalance Adjustment) are complete before they save the images. Otherwise, it becomes dark for the first photo.
How do I set up a key value observer to run code after values change? And how / where is the best place to launch it?
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1 answer
After you get the image, do var
with didSet
and this var will save the image ex
var image : UIImage{//or what type your image is,Maby NSData,but I'm not sure
didSet{
// adjustingExposure and adjustingWhiteBalance
}
and then save EX:
func grabImage(){//is an example IDK your code,I say that this func captured the imagedate
image = imageThatYouTook
//then save the image data from the image var
}
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