保存带有 GIF 图像叠加层的视频
Saving video with overlay of GIF image
我正在开发一个录制视频的应用程序。录制完成后，我使用 Library 在上面放了一张 GIF 图片。
我的播放视频和将 gif 图像作为叠加层的代码
self.avPlayer = [AVPlayer playerWithURL:self.urlstring];
self.avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;
AVPlayerLayer *videoLayer = [AVPlayerLayer playerLayerWithPlayer:self.avPlayer];
videoLayer.frame = self.preview_view.bounds;
videoLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[self.preview_view.layer addSublayer:videoLayer];
NSURL *url = [[NSBundle mainBundle] URLForResource:@"02" withExtension:@"gif"];
self.img_gif.image = [UIImage animatedImageWithAnimatedGIFData:[NSData dataWithContentsOfURL:url]];
但现在我想合并并保存覆盖此 GIF 图像的视频。我google它没有找到我想要的。
感谢您的帮助
您可以尝试使用以下任何代码进行屏幕录制。它将合并您的视频和 GIF。
您可以从下面Apple提供的link下载示例。 https://developer.apple.com/library/mac/samplecode/AVScreenShack/Introduction/Intro.html
https://github.com/alskipp/ASScreenRecorder
http://codethink.no-ip.org/wordpress/archives/673
希望对你有帮助..
这是将视频与 GIF 图片合并的最佳答案。
- (void)mixVideoAsset:(AVAsset *)videoAsset {
NSDate * begin = [NSDate date];
// 2 - Create AVMutableComposition object. This object will hold your AVMutableCompositionTrack instances.
AVMutableComposition *mixComposition = [[AVMutableComposition alloc] init];
// 3 - Video track
AVMutableCompositionTrack *videoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo
preferredTrackID:kCMPersistentTrackID_Invalid];
[videoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)
ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]
atTime:kCMTimeZero error:nil];
// - Audio
AVMutableCompositionTrack *audioCompositionTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *audioTrack = [[videoAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
[audioCompositionTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioTrack.timeRange.duration) ofTrack:audioTrack atTime:kCMTimeZero error:nil];
// 3.1 - Create AVMutableVideoCompositionInstruction
AVMutableVideoCompositionInstruction *mainInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
mainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, videoAsset.duration);
// 3.2 - Create an AVMutableVideoCompositionLayerInstruction for the video track and fix the orientation.
AVMutableVideoCompositionLayerInstruction *videolayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];
AVAssetTrack *videoAssetTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
UIImageOrientation videoAssetOrientation_ = UIImageOrientationUp;
BOOL isVideoAssetPortrait_ = NO;
CGAffineTransform videoTransform = videoAssetTrack.preferredTransform;
if (videoTransform.a == 0 && videoTransform.b == 1.0 && videoTransform.c == -1.0 && videoTransform.d == 0) {
videoAssetOrientation_ = UIImageOrientationRight;
isVideoAssetPortrait_ = YES;
}
if (videoTransform.a == 0 && videoTransform.b == -1.0 && videoTransform.c == 1.0 && videoTransform.d == 0) {
videoAssetOrientation_ = UIImageOrientationLeft;
isVideoAssetPortrait_ = YES;
}
if (videoTransform.a == 1.0 && videoTransform.b == 0 && videoTransform.c == 0 && videoTransform.d == 1.0) {
videoAssetOrientation_ = UIImageOrientationUp;
}
if (videoTransform.a == -1.0 && videoTransform.b == 0 && videoTransform.c == 0 && videoTransform.d == -1.0) {
videoAssetOrientation_ = UIImageOrientationDown;
}
[videolayerInstruction setTransform:videoAssetTrack.preferredTransform atTime:kCMTimeZero];
[videolayerInstruction setOpacity:0.0 atTime:videoAsset.duration];
// 3.3 - Add instructions
mainInstruction.layerInstructions = [NSArray arrayWithObjects:videolayerInstruction,nil];
AVMutableVideoComposition *mainCompositionInst = [AVMutableVideoComposition videoComposition];
CGSize naturalSize;
if(isVideoAssetPortrait_){
naturalSize = CGSizeMake(videoAssetTrack.naturalSize.height, videoAssetTrack.naturalSize.width);
} else {
naturalSize = videoAssetTrack.naturalSize;
}
float renderWidth, renderHeight;
renderWidth = naturalSize.width;
renderHeight = naturalSize.height;
mainCompositionInst.renderSize = CGSizeMake(renderWidth, renderHeight);
mainCompositionInst.instructions = [NSArray arrayWithObject:mainInstruction];
mainCompositionInst.frameDuration = CMTimeMake(1, 30);
// Watermark Layers
[self applyVideoEffectsToComposition:mainCompositionInst size:naturalSize];
// 4 - Get path
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *myPathDocs = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithFormat:@"FinalVideo-%d.mov",arc4random() % 1000]];
NSURL *url = [NSURL fileURLWithPath:myPathDocs];
// NSURL * url = TempVideoURL();
// 5 - Create exporter
AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition
presetName:AVAssetExportPresetHighestQuality];
exporter.outputURL=url;
exporter.outputFileType = AVFileTypeMPEG4;
exporter.shouldOptimizeForNetworkUse = YES;
exporter.videoComposition = mainCompositionInst;
[exporter exportAsynchronouslyWithCompletionHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
NSDate * endDate = [NSDate date];
NSTimeInterval interval = [endDate timeIntervalSinceDate:begin];
NSLog(@"completed %f senconds",interval);
ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
if ([assetsLibrary videoAtPathIsCompatibleWithSavedPhotosAlbum:exporter.outputURL]) {
[assetsLibrary writeVideoAtPathToSavedPhotosAlbum:exporter.outputURL completionBlock:NULL];
}
});
}];
}
- (void)applyVideoEffectsToComposition:(AVMutableVideoComposition *)composition size:(CGSize)size
{
// - set up the parent layer
CALayer *parentLayer = [CALayer layer];
CALayer *videoLayer = [CALayer layer];
parentLayer.frame = CGRectMake(0, 0, size.width, size.height);
videoLayer.frame = CGRectMake(0, 0, size.width, size.height);
[parentLayer addSublayer:videoLayer];
size.width = 100;
size.height = 100;
// - set up the overlay
CALayer *overlayLayer = [CALayer layer];
overlayLayer.frame = CGRectMake(0, 100, size.width, size.height);
NSURL *fileUrl = [[NSBundle mainBundle] URLForResource:@"jiafei" withExtension:@"gif"];
[self startGifAnimationWithURL:fileUrl inLayer:overlayLayer];
// UIImage * image = [UIImage imageNamed:@"gifImage.gif"];
// [overlayLayer setContents:(id)[image CGImage]];
// [overlayLayer setMasksToBounds:YES];
[parentLayer addSublayer:overlayLayer];
// - apply magic
composition.animationTool = [AVVideoCompositionCoreAnimationTool
videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer];
}
- (void)startGifAnimationWithURL:(NSURL *)url inLayer:(CALayer *)layer {
CAKeyframeAnimation * animation = [self animationForGifWithURL:url];
[layer addAnimation:animation forKey:@"contents"];
}
- (CAKeyframeAnimation *)animationForGifWithURL:(NSURL *)url {
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];
NSMutableArray * frames = [NSMutableArray new];
NSMutableArray *delayTimes = [NSMutableArray new];
CGFloat totalTime = 0.0;
CGFloat gifWidth;
CGFloat gifHeight;
CGImageSourceRef gifSource = CGImageSourceCreateWithURL((CFURLRef)url, NULL);
// get frame count
size_t frameCount = CGImageSourceGetCount(gifSource);
for (size_t i = 0; i < frameCount; ++i) {
// get each frame
CGImageRef frame = CGImageSourceCreateImageAtIndex(gifSource, i, NULL);
[frames addObject:(__bridge id)frame];
CGImageRelease(frame);
// get gif info with each frame
NSDictionary *dict = (NSDictionary*)CFBridgingRelease(CGImageSourceCopyPropertiesAtIndex(gifSource, i, NULL));
NSLog(@"kCGImagePropertyGIFDictionary %@", [dict valueForKey:(NSString*)kCGImagePropertyGIFDictionary]);
// get gif size
gifWidth = [[dict valueForKey:(NSString*)kCGImagePropertyPixelWidth] floatValue];
gifHeight = [[dict valueForKey:(NSString*)kCGImagePropertyPixelHeight] floatValue];
// kCGImagePropertyGIFDictionary中kCGImagePropertyGIFDelayTime，kCGImagePropertyGIFUnclampedDelayTime值是一样的
NSDictionary *gifDict = [dict valueForKey:(NSString*)kCGImagePropertyGIFDictionary];
[delayTimes addObject:[gifDict valueForKey:(NSString*)kCGImagePropertyGIFDelayTime]];
totalTime = totalTime + [[gifDict valueForKey:(NSString*)kCGImagePropertyGIFDelayTime] floatValue];
CFRelease((__bridge CFTypeRef)(dict));
}
if (gifSource) {
CFRelease(gifSource);
}
NSMutableArray *times = [NSMutableArray arrayWithCapacity:3];
CGFloat currentTime = 0;
NSInteger count = delayTimes.count;
for (int i = 0; i < count; ++i) {
[times addObject:[NSNumber numberWithFloat:(currentTime / totalTime)]];
currentTime += [[delayTimes objectAtIndex:i] floatValue];
}
NSMutableArray *images = [NSMutableArray arrayWithCapacity:3];
for (int i = 0; i < count; ++i) {
[images addObject:[frames objectAtIndex:i]];
}
animation.keyTimes = times;
animation.values = images;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
animation.duration = totalTime;
animation.repeatCount = HUGE_VALF;
animation.beginTime = AVCoreAnimationBeginTimeAtZero;
animation.removedOnCompletion = NO;
return animation;
}
这是@Jitendra Modi 的回答的 swift 版本，它非常有效。
Swift 5.2:
func animationForGif(with url: URL) -> CAKeyframeAnimation? {
let animation = CAKeyframeAnimation(keyPath: #keyPath(CALayer.contents))
var frames: [CGImage] = []
var delayTimes: [CGFloat] = []
var totalTime: CGFloat = 0.0
// var gifWidth: CGFloat, gifHeight: CGFloat
guard let gifSource = CGImageSourceCreateWithURL(url as CFURL, nil) else {
print("Can not get image source from the gif: \(url)")
return nil
}
// get frame
let frameCount = CGImageSourceGetCount(gifSource)
for i in 0..<frameCount {
guard let frame = CGImageSourceCreateImageAtIndex(gifSource, i, nil) else {
continue
}
guard let dic = CGImageSourceCopyPropertiesAtIndex(gifSource, i, nil) as? [AnyHashable: Any] else { continue }
// gifWidth = dic[kCGImagePropertyPixelWidth] as? CGFloat ?? 0
// gifHeight = dic[kCGImagePropertyPixelHeight] as? CGFloat ?? 0
guard let gifDic: [AnyHashable: Any] = dic[kCGImagePropertyGIFDictionary] as? [AnyHashable: Any] else { continue }
let delayTime = gifDic[kCGImagePropertyGIFDelayTime] as? CGFloat ?? 0
frames.append(frame)
delayTimes.append(delayTime)
totalTime += delayTime
}
if frames.count == 0 {
return nil
}
assert(frames.count == delayTimes.count)
var times: [NSNumber] = []
var currentTime: CGFloat = 0
for i in 0..<delayTimes.count {
times.append(NSNumber(value: Double(currentTime / totalTime)))
currentTime += delayTimes[i]
}
animation.keyTimes = times
animation.values = frames
animation.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.linear)
animation.duration = Double(totalTime)
animation.repeatCount = .greatestFiniteMagnitude
animation.beginTime = AVCoreAnimationBeginTimeAtZero
animation.isRemovedOnCompletion = false
return animation
}
你可以使用这个动画：
let gifLayer = CALayer()
gifLayer.frame = CGRect(x: 0, y: 0, width: 300, height: 300)
if let animation = animationForGif(with: gifUrl) {
gifLayer.add(animation, forKey: "contents")
}
parentLayer.addSublayer(gifLayer)
我正在开发一个录制视频的应用程序。录制完成后，我使用 Library 在上面放了一张 GIF 图片。
我的播放视频和将 gif 图像作为叠加层的代码
self.avPlayer = [AVPlayer playerWithURL:self.urlstring];
self.avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;
AVPlayerLayer *videoLayer = [AVPlayerLayer playerLayerWithPlayer:self.avPlayer];
videoLayer.frame = self.preview_view.bounds;
videoLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[self.preview_view.layer addSublayer:videoLayer];
NSURL *url = [[NSBundle mainBundle] URLForResource:@"02" withExtension:@"gif"];
self.img_gif.image = [UIImage animatedImageWithAnimatedGIFData:[NSData dataWithContentsOfURL:url]];
但现在我想合并并保存覆盖此 GIF 图像的视频。我google它没有找到我想要的。
感谢您的帮助
您可以尝试使用以下任何代码进行屏幕录制。它将合并您的视频和 GIF。
您可以从下面Apple提供的link下载示例。 https://developer.apple.com/library/mac/samplecode/AVScreenShack/Introduction/Intro.html
https://github.com/alskipp/ASScreenRecorder
http://codethink.no-ip.org/wordpress/archives/673
希望对你有帮助..
这是将视频与 GIF 图片合并的最佳答案。
- (void)mixVideoAsset:(AVAsset *)videoAsset {
NSDate * begin = [NSDate date];
// 2 - Create AVMutableComposition object. This object will hold your AVMutableCompositionTrack instances.
AVMutableComposition *mixComposition = [[AVMutableComposition alloc] init];
// 3 - Video track
AVMutableCompositionTrack *videoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo
preferredTrackID:kCMPersistentTrackID_Invalid];
[videoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)
ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]
atTime:kCMTimeZero error:nil];
// - Audio
AVMutableCompositionTrack *audioCompositionTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *audioTrack = [[videoAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
[audioCompositionTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioTrack.timeRange.duration) ofTrack:audioTrack atTime:kCMTimeZero error:nil];
// 3.1 - Create AVMutableVideoCompositionInstruction
AVMutableVideoCompositionInstruction *mainInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
mainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, videoAsset.duration);
// 3.2 - Create an AVMutableVideoCompositionLayerInstruction for the video track and fix the orientation.
AVMutableVideoCompositionLayerInstruction *videolayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];
AVAssetTrack *videoAssetTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
UIImageOrientation videoAssetOrientation_ = UIImageOrientationUp;
BOOL isVideoAssetPortrait_ = NO;
CGAffineTransform videoTransform = videoAssetTrack.preferredTransform;
if (videoTransform.a == 0 && videoTransform.b == 1.0 && videoTransform.c == -1.0 && videoTransform.d == 0) {
videoAssetOrientation_ = UIImageOrientationRight;
isVideoAssetPortrait_ = YES;
}
if (videoTransform.a == 0 && videoTransform.b == -1.0 && videoTransform.c == 1.0 && videoTransform.d == 0) {
videoAssetOrientation_ = UIImageOrientationLeft;
isVideoAssetPortrait_ = YES;
}
if (videoTransform.a == 1.0 && videoTransform.b == 0 && videoTransform.c == 0 && videoTransform.d == 1.0) {
videoAssetOrientation_ = UIImageOrientationUp;
}
if (videoTransform.a == -1.0 && videoTransform.b == 0 && videoTransform.c == 0 && videoTransform.d == -1.0) {
videoAssetOrientation_ = UIImageOrientationDown;
}
[videolayerInstruction setTransform:videoAssetTrack.preferredTransform atTime:kCMTimeZero];
[videolayerInstruction setOpacity:0.0 atTime:videoAsset.duration];
// 3.3 - Add instructions
mainInstruction.layerInstructions = [NSArray arrayWithObjects:videolayerInstruction,nil];
AVMutableVideoComposition *mainCompositionInst = [AVMutableVideoComposition videoComposition];
CGSize naturalSize;
if(isVideoAssetPortrait_){
naturalSize = CGSizeMake(videoAssetTrack.naturalSize.height, videoAssetTrack.naturalSize.width);
} else {
naturalSize = videoAssetTrack.naturalSize;
}
float renderWidth, renderHeight;
renderWidth = naturalSize.width;
renderHeight = naturalSize.height;
mainCompositionInst.renderSize = CGSizeMake(renderWidth, renderHeight);
mainCompositionInst.instructions = [NSArray arrayWithObject:mainInstruction];
mainCompositionInst.frameDuration = CMTimeMake(1, 30);
// Watermark Layers
[self applyVideoEffectsToComposition:mainCompositionInst size:naturalSize];
// 4 - Get path
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *myPathDocs = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithFormat:@"FinalVideo-%d.mov",arc4random() % 1000]];
NSURL *url = [NSURL fileURLWithPath:myPathDocs];
// NSURL * url = TempVideoURL();
// 5 - Create exporter
AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition
presetName:AVAssetExportPresetHighestQuality];
exporter.outputURL=url;
exporter.outputFileType = AVFileTypeMPEG4;
exporter.shouldOptimizeForNetworkUse = YES;
exporter.videoComposition = mainCompositionInst;
[exporter exportAsynchronouslyWithCompletionHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
NSDate * endDate = [NSDate date];
NSTimeInterval interval = [endDate timeIntervalSinceDate:begin];
NSLog(@"completed %f senconds",interval);
ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
if ([assetsLibrary videoAtPathIsCompatibleWithSavedPhotosAlbum:exporter.outputURL]) {
[assetsLibrary writeVideoAtPathToSavedPhotosAlbum:exporter.outputURL completionBlock:NULL];
}
});
}];
}
- (void)applyVideoEffectsToComposition:(AVMutableVideoComposition *)composition size:(CGSize)size
{
// - set up the parent layer
CALayer *parentLayer = [CALayer layer];
CALayer *videoLayer = [CALayer layer];
parentLayer.frame = CGRectMake(0, 0, size.width, size.height);
videoLayer.frame = CGRectMake(0, 0, size.width, size.height);
[parentLayer addSublayer:videoLayer];
size.width = 100;
size.height = 100;
// - set up the overlay
CALayer *overlayLayer = [CALayer layer];
overlayLayer.frame = CGRectMake(0, 100, size.width, size.height);
NSURL *fileUrl = [[NSBundle mainBundle] URLForResource:@"jiafei" withExtension:@"gif"];
[self startGifAnimationWithURL:fileUrl inLayer:overlayLayer];
// UIImage * image = [UIImage imageNamed:@"gifImage.gif"];
// [overlayLayer setContents:(id)[image CGImage]];
// [overlayLayer setMasksToBounds:YES];
[parentLayer addSublayer:overlayLayer];
// - apply magic
composition.animationTool = [AVVideoCompositionCoreAnimationTool
videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer];
}
- (void)startGifAnimationWithURL:(NSURL *)url inLayer:(CALayer *)layer {
CAKeyframeAnimation * animation = [self animationForGifWithURL:url];
[layer addAnimation:animation forKey:@"contents"];
}
- (CAKeyframeAnimation *)animationForGifWithURL:(NSURL *)url {
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];
NSMutableArray * frames = [NSMutableArray new];
NSMutableArray *delayTimes = [NSMutableArray new];
CGFloat totalTime = 0.0;
CGFloat gifWidth;
CGFloat gifHeight;
CGImageSourceRef gifSource = CGImageSourceCreateWithURL((CFURLRef)url, NULL);
// get frame count
size_t frameCount = CGImageSourceGetCount(gifSource);
for (size_t i = 0; i < frameCount; ++i) {
// get each frame
CGImageRef frame = CGImageSourceCreateImageAtIndex(gifSource, i, NULL);
[frames addObject:(__bridge id)frame];
CGImageRelease(frame);
// get gif info with each frame
NSDictionary *dict = (NSDictionary*)CFBridgingRelease(CGImageSourceCopyPropertiesAtIndex(gifSource, i, NULL));
NSLog(@"kCGImagePropertyGIFDictionary %@", [dict valueForKey:(NSString*)kCGImagePropertyGIFDictionary]);
// get gif size
gifWidth = [[dict valueForKey:(NSString*)kCGImagePropertyPixelWidth] floatValue];
gifHeight = [[dict valueForKey:(NSString*)kCGImagePropertyPixelHeight] floatValue];
// kCGImagePropertyGIFDictionary中kCGImagePropertyGIFDelayTime，kCGImagePropertyGIFUnclampedDelayTime值是一样的
NSDictionary *gifDict = [dict valueForKey:(NSString*)kCGImagePropertyGIFDictionary];
[delayTimes addObject:[gifDict valueForKey:(NSString*)kCGImagePropertyGIFDelayTime]];
totalTime = totalTime + [[gifDict valueForKey:(NSString*)kCGImagePropertyGIFDelayTime] floatValue];
CFRelease((__bridge CFTypeRef)(dict));
}
if (gifSource) {
CFRelease(gifSource);
}
NSMutableArray *times = [NSMutableArray arrayWithCapacity:3];
CGFloat currentTime = 0;
NSInteger count = delayTimes.count;
for (int i = 0; i < count; ++i) {
[times addObject:[NSNumber numberWithFloat:(currentTime / totalTime)]];
currentTime += [[delayTimes objectAtIndex:i] floatValue];
}
NSMutableArray *images = [NSMutableArray arrayWithCapacity:3];
for (int i = 0; i < count; ++i) {
[images addObject:[frames objectAtIndex:i]];
}
animation.keyTimes = times;
animation.values = images;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
animation.duration = totalTime;
animation.repeatCount = HUGE_VALF;
animation.beginTime = AVCoreAnimationBeginTimeAtZero;
animation.removedOnCompletion = NO;
return animation;
}
这是@Jitendra Modi 的回答的 swift 版本，它非常有效。
Swift 5.2:
func animationForGif(with url: URL) -> CAKeyframeAnimation? {
let animation = CAKeyframeAnimation(keyPath: #keyPath(CALayer.contents))
var frames: [CGImage] = []
var delayTimes: [CGFloat] = []
var totalTime: CGFloat = 0.0
// var gifWidth: CGFloat, gifHeight: CGFloat
guard let gifSource = CGImageSourceCreateWithURL(url as CFURL, nil) else {
print("Can not get image source from the gif: \(url)")
return nil
}
// get frame
let frameCount = CGImageSourceGetCount(gifSource)
for i in 0..<frameCount {
guard let frame = CGImageSourceCreateImageAtIndex(gifSource, i, nil) else {
continue
}
guard let dic = CGImageSourceCopyPropertiesAtIndex(gifSource, i, nil) as? [AnyHashable: Any] else { continue }
// gifWidth = dic[kCGImagePropertyPixelWidth] as? CGFloat ?? 0
// gifHeight = dic[kCGImagePropertyPixelHeight] as? CGFloat ?? 0
guard let gifDic: [AnyHashable: Any] = dic[kCGImagePropertyGIFDictionary] as? [AnyHashable: Any] else { continue }
let delayTime = gifDic[kCGImagePropertyGIFDelayTime] as? CGFloat ?? 0
frames.append(frame)
delayTimes.append(delayTime)
totalTime += delayTime
}
if frames.count == 0 {
return nil
}
assert(frames.count == delayTimes.count)
var times: [NSNumber] = []
var currentTime: CGFloat = 0
for i in 0..<delayTimes.count {
times.append(NSNumber(value: Double(currentTime / totalTime)))
currentTime += delayTimes[i]
}
animation.keyTimes = times
animation.values = frames
animation.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.linear)
animation.duration = Double(totalTime)
animation.repeatCount = .greatestFiniteMagnitude
animation.beginTime = AVCoreAnimationBeginTimeAtZero
animation.isRemovedOnCompletion = false
return animation
}
你可以使用这个动画：
let gifLayer = CALayer()
gifLayer.frame = CGRect(x: 0, y: 0, width: 300, height: 300)
if let animation = animationForGif(with: gifUrl) {
gifLayer.add(animation, forKey: "contents")
}
parentLayer.addSublayer(gifLayer)