35 lines
1.1 KiB
Swift
35 lines
1.1 KiB
Swift
import UIKit
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import ImageIO
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import MobileCoreServices
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func CGImageSourceContainsAnimatedGIF(imageSource: CGImageSource) -> Bool {
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let isTypeGIF = UTTypeConformsTo(CGImageSourceGetType(imageSource), kUTTypeGIF)
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let imageCount = CGImageSourceGetCount(imageSource)
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return isTypeGIF != 0 && imageCount > 1
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}
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func CGImageSourceGIFFrameDuration(imageSource: CGImageSource, index: Int) -> NSTimeInterval {
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let containsAnimatedGIF = CGImageSourceContainsAnimatedGIF(imageSource)
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if !containsAnimatedGIF { return 0.0 }
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var duration = 0.0
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let imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, UInt(index), nil) as NSDictionary
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let GIFProperties: NSDictionary? = imageProperties.objectForKey(kCGImagePropertyGIFDictionary) as? NSDictionary
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if let properties = GIFProperties {
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duration = properties.valueForKey(kCGImagePropertyGIFUnclampedDelayTime) as Double
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if duration <= 0 {
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duration = properties.valueForKey(kCGImagePropertyGIFDelayTime) as Double
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}
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}
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let threshold = 0.02 - Double(FLT_EPSILON)
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if duration > 0 && duration < threshold {
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duration = 0.1
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}
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return duration
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}
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