thumbnailImageAtTime:timeOption 已弃用：首先在 iOS 7 中弃用

Question

我有以下代码：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self.tableView deselectRowAtIndexPath:indexPath animated:NO];
self.selectedMessage = [self.messages objectAtIndex:indexPath.row];
NSString *fileType = [self.selectedMessage objectForKey:@"fileType"];
if ([fileType isEqualToString:@"image"]) {
    [self performSegueWithIdentifier:@"showImage" sender:self];

} else {

    // File type is video
    PFFile *videoFile = [self.selectedMessage objectForKey:@"file"];
    NSURL *fileUrl = [NSURL URLWithString:videoFile.url];
    self.moviePlayer.contentURL = fileUrl;
    [self.moviePlayer prepareToPlay];
    [self.moviePlayer thumbnailImageAtTime:0 timeOption:MPMovieTimeOptionNearestKeyFrame];

    // Add it to the view controller so we can see it
    [self.view addSubview:self.moviePlayer.view];
    [self.moviePlayer setFullscreen:YES animated:YES];
}

上面写着：

[self.moviePlayer thumbnailImageAtTime:0 timeOption:MPMovieTimeOptionNearestKeyFrame];

它给了我错误：

thumbnailImageAtTime:timeOption: 已弃用：首先在 iOS 7.0 中弃用

如果有人能帮助解决这个问题，我们将不胜感激。 谢谢！

Answer 1

请在此处查看我对同一问题的回答ThumbnailImageAtTime Deprecated - What's the alternative

AVURLAsset *asset1 = [[AVURLAsset alloc] initWithURL:partOneUrl options:nil];
AVAssetImageGenerator *generate1 = [[AVAssetImageGenerator alloc] initWithAsset:asset1];
generate1.appliesPreferredTrackTransform = YES;
NSError *err = NULL;
CMTime time = CMTimeMake(1, 2);
CGImageRef oneRef = [generate1 copyCGImageAtTime:time actualTime:NULL error:&err];
UIImage *one = [[UIImage alloc] initWithCGImage:oneRef];
[_firstImage setImage:one];
_firstImage.contentMode = UIViewContentModeScaleAspectFit;

在头文件中，请导入

#import <AVFoundation/AVFoundation.h>

它运行完美，我已经能够从 viewDidLoad 调用它，这比从 viewDidAppear 调用已弃用的 thumbNailImageAtTime: 更快。

希望这可以帮助遇到同样问题的其他人。

Answer 2

AVURLAsset *asset1 = [[AVURLAsset alloc] initWithURL:partOneUrl options:nil];
AVAssetImageGenerator *generate1 = [[AVAssetImageGenerator alloc] initWithAsset:asset1];
generate1.appliesPreferredTrackTransform = YES;
NSError *err = NULL;
CMTime time = CMTimeMake(1, 2);
CGImageRef oneRef = [generate1 copyCGImageAtTime:time actualTime:NULL error:&err];
UIImage *one = [[UIImage alloc] initWithCGImage:oneRef];
[_firstImage setImage:one];
_firstImage.contentMode = UIViewContentModeScaleAspectFit;

添加AVFoundation和CoreMedia框架

#import <AVFoundation/AVFoundation.h>
#import <CoreMedia/CoreMedia.h>