MPMediaItemArtwork init(image:) deprecated in iOS 10.0

问题

Apple has deprecated init(image:) method in MPMediaItemArtwork in iOS 10. What is the new alternative.

the class shows interface shows method below to be available in the new OS version

public init(boundsSize: CGSize, requestHandler: @escaping (CGSize) -> UIImage)

Anyone know how to use it?

Also question 2, part of the previous question: Does showing now playing metadata on the lock-screen and control-center using MPNowPlayingInfoCenter work in the simulator?

回答1:

You can use the following code:

let image = UIImage(named: "logo")!
let artwork = MPMediaItemArtwork.init(boundsSize: image.size, requestHandler: { (size) -> UIImage in
        return image
})

And, yes, "now playing" metadata shows on the control center in the simulator.

回答2:

I was wondering the same and ended up finding Apple's explanation for this.

They say we shouldn't do any expensive resizing operations on the image when handler is requested, but instead simply return the closely matching image out of ones already available to you.

The following WWDC 2017 video is where they mention it. It's about tvOS, but at least we get some insight. Starts at 07:20: https://developer.apple.com/videos/play/wwdc2017/251/?time=440

回答3:

I saw this just now and I'm confused too, but I guess this is the right way:

self.remoteArtwork = [[MPMediaItemArtwork alloc] initWithBoundsSize:CGSizeMake(600, 600) requestHandler:^UIImage * _Nonnull(CGSize size) {

    UIImage *lockScreenArtworkApp = [UIImage imageNamed:@"lockScreenLogo"];

    return [self.manager resizeImageWithImage:lockScreenArtworkApp scaledToSize:size];        
}];

The method - in my case in a singleton "Manager"-Class

- (UIImage *)resizeImageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
    //UIGraphicsBeginImageContext(newSize);
    // In next line, pass 0.0 to use the current device's pixel scaling factor (and thus account for Retina resolution).
    // Pass 1.0 to force exact pixel size.
    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

回答4:

Minimum code:

MPMediaItemArtwork(boundsSize: image.size) { _ in image }

来源：https://stackoverflow.com/questions/41191452/mpmediaitemartwork-initimage-deprecated-in-ios-10-0

标签

ios

swift

ios10

mpnowplayinginfocenter