private static UIImageView CreateAnimatedImageView(CGImageSource imageSource, UIImageView imageView = null)
{
var frameCount = imageSource.ImageCount;
var frameImages = new List <NSObject>((int)frameCount);
var frameCGImages = new List <CGImage>((int)frameCount);
var frameDurations = new List <double>((int)frameCount);
var totalFrameDuration = 0.0;
for (int i = 0; i < frameCount; i++)
{
var frameImage = imageSource.CreateImage(i, null);
frameCGImages.Add(frameImage);
frameImages.Add(NSObject.FromObject(frameImage));
var properties = imageSource.GetProperties(i, null);
var duration = properties.Dictionary["{GIF}"];
var delayTime = duration.ValueForKey(new NSString("DelayTime"));
duration.Dispose();
var realDuration = double.Parse(delayTime.ToString());
frameDurations.Add(realDuration);
totalFrameDuration += realDuration;
frameImage.Dispose();
}
var framePercentageDurations = new List <NSNumber>((int)frameCount);
var framePercentageDurationsDouble = new List <double>((int)frameCount);
NSNumber currentDurationPercentage = 0.0f;
double currentDurationDouble = 0.0f;
for (int i = 0; i < frameCount; i++)
{
if (i != 0)
{
var previousDuration = frameDurations[i - 1];
var previousDurationPercentage = framePercentageDurationsDouble[i - 1];
var number = previousDurationPercentage + (previousDuration / totalFrameDuration);
currentDurationDouble = number;
currentDurationPercentage = new NSNumber(number);
}
framePercentageDurationsDouble.Add(currentDurationDouble);
framePercentageDurations.Add(currentDurationPercentage);
}
var imageSourceProperties = imageSource.GetProperties(null);
var imageSourceGIFProperties = imageSourceProperties.Dictionary["{GIF}"];
var loopCount = imageSourceGIFProperties.ValueForKey(new NSString("LoopCount"));
var imageSourceLoopCount = float.Parse(loopCount.ToString());
var frameAnimation = new CAKeyFrameAnimation();
frameAnimation.KeyPath = "contents";
if (imageSourceLoopCount <= 0.0f)
{
frameAnimation.RepeatCount = float.MaxValue;
}
else
{
frameAnimation.RepeatCount = imageSourceLoopCount;
}
imageSourceGIFProperties.Dispose();
frameAnimation.CalculationMode = CAAnimation.AnimationDescrete;
frameAnimation.Values = frameImages.ToArray();
frameAnimation.Duration = totalFrameDuration;
frameAnimation.KeyTimes = framePercentageDurations.ToArray();
frameAnimation.RemovedOnCompletion = false;
var firstFrame = frameCGImages[0];
if (imageView == null)
{
imageView = new UIImageView(new CGRect(0.0f, 0.0f, firstFrame.Width, firstFrame.Height));
}
else
{
imageView.Layer.RemoveAllAnimations();
}
imageView.Layer.AddAnimation(frameAnimation, "contents");
frameAnimation.Dispose();
return(imageView);
}
private static UIImageView CreateAnimatedImageView(CGImageSource imageSource, UIImageView imageView = null)
{
var frameCount = imageSource.ImageCount;
var frameImages = new List<NSObject>((int)frameCount);
var frameCGImages = new List<CGImage>((int)frameCount);
var frameDurations = new List<double>((int)frameCount);
var totalFrameDuration = 0.0;
for (int i = 0; i < frameCount; i++)
{
var frameImage = imageSource.CreateImage(i, null);
frameCGImages.Add(frameImage);
frameImages.Add(NSObject.FromObject(frameImage));
var properties = imageSource.GetProperties(i, null);
var duration = properties.Dictionary["{GIF}"];
var delayTime = duration.ValueForKey(new NSString("DelayTime"));
duration.Dispose ();
var realDuration = double.Parse(delayTime.ToString());
frameDurations.Add(realDuration);
totalFrameDuration += realDuration;
frameImage.Dispose ();
}
var framePercentageDurations = new List<NSNumber>((int)frameCount);
var framePercentageDurationsDouble = new List<double>((int)frameCount);
NSNumber currentDurationPercentage = 0.0f;
double currentDurationDouble = 0.0f;
for (int i = 0; i < frameCount; i++)
{
if (i != 0)
{
var previousDuration = frameDurations[i - 1];
var previousDurationPercentage = framePercentageDurationsDouble[i - 1];
var number = previousDurationPercentage + (previousDuration/totalFrameDuration);
currentDurationDouble = number;
currentDurationPercentage = new NSNumber(number);
}
framePercentageDurationsDouble.Add(currentDurationDouble);
framePercentageDurations.Add(currentDurationPercentage);
}
var imageSourceProperties = imageSource.GetProperties(null);
var imageSourceGIFProperties = imageSourceProperties.Dictionary["{GIF}"];
var loopCount = imageSourceGIFProperties.ValueForKey(new NSString("LoopCount"));
var imageSourceLoopCount = float.Parse(loopCount.ToString());
var frameAnimation = new CAKeyFrameAnimation();
frameAnimation.KeyPath = "contents";
if (imageSourceLoopCount <= 0.0f)
{
frameAnimation.RepeatCount = float.MaxValue;
}
else
{
frameAnimation.RepeatCount = imageSourceLoopCount;
}
imageSourceGIFProperties.Dispose ();
frameAnimation.CalculationMode = CAAnimation.AnimationDescrete;
frameAnimation.Values = frameImages.ToArray();
frameAnimation.Duration = totalFrameDuration;
frameAnimation.KeyTimes = framePercentageDurations.ToArray();
frameAnimation.RemovedOnCompletion = false;
var firstFrame = frameCGImages[0];
if(imageView == null)
imageView = new UIImageView(new CGRect(0.0f, 0.0f, firstFrame.Width, firstFrame.Height));
else
imageView.Layer.RemoveAllAnimations();
imageView.Layer.AddAnimation(frameAnimation, "contents");
frameAnimation.Dispose ();
return imageView;
}
