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JorgeMadson/AnimatedImageView.cs

Forked from jamesmontemagno/AnimatedImageView.cs
Last active September 1, 2017 13:35
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AnimatedImageView.cs
using CoreAnimation;
using CoreGraphics;
using Foundation;
using ImageIO;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Text;
using UIKit;
namespace AprendendoiOS
{
public class AnimatedImageView
{
public static UIImageView GetAnimatedImageView(string url, UIImageView imageView = null)
{
var sourceRef = CGImageSource.FromUrl(NSUrl.FromString(url));
return CreateAnimatedImageView(sourceRef, imageView);
}
public static UIImageView GetAnimatedImageView(NSData nsData, UIImageView imageView = null)
{
var sourceRef = CGImageSource.FromData(nsData);
return CreateAnimatedImageView(sourceRef, imageView);
}
private static UIImageView CreateAnimatedImageView(CGImageSource imageSource, UIImageView imageView = null)
{
var frameCount = imageSource.ImageCount;
var frameImages = new List<NSObject>(Convert.ToInt16(frameCount));
var frameCGImages = new List<CGImage>(Convert.ToInt16(frameCount));
var frameDurations = new List<double>(Convert.ToInt16(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>(Convert.ToInt16(frameCount));
var framePercentageDurationsDouble = new List<double>(Convert.ToInt16(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 RectangleF(0.0f, 0.0f, firstFrame.Width, firstFrame.Height));
else
imageView.Layer.RemoveAllAnimations();
imageView.Layer.AddAnimation(frameAnimation, "contents");
frameAnimation.Dispose();
return imageView;
}
}
}
Raw
Usage
var client = new HttpClient();
var stream = await client.GetStreamAsync(image);
var data = await GetDataAsync(stream);
AnimatedImageView.GetAnimatedImageView(data, ImageViewAnimal);
private async Task<NSData> GetDataAsync(Stream stream)
{
return await Task.Run (() => {return NSData.FromStream (stream);});
}
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