在Swift中创建GIF动画的问题 [英] Problems creating an animated gif in Swift

问题描述

我正在尝试从Swift中的4个 UIImage 元素的数组创建一个动画gif，但目前只保存第一帧。

I am trying to create an animated gif from an array of 4 UIImage elements in Swift but currently it only saves the first frame.

let url = NSURL(fileURLWithPath: photosDirectory)?.URLByAppendingPathComponent(filename())

if let url = url {
    let fileProperties = [kCGImagePropertyGIFDictionary as String: [kCGImagePropertyGIFLoopCount as String: 0]]
    let gifProperties = [kCGImagePropertyGIFDictionary as String: [kCGImagePropertyGIFDelayTime as String: 0.125]]
    let destination = CGImageDestinationCreateWithURL(url, kUTTypeGIF, photos.count, nil)

    CGImageDestinationSetProperties(destination, fileProperties)

    for photo in photos {
        CGImageDestinationAddImage(destination, photo.CGImage, gifProperties)
    }

    return CGImageDestinationFinalize(destination)
}
else {
    return false
}

照片是数组 UIImages
filename（）只返回一个字符串，如 20150805。 gif

photos is the array of UIImages filename() just returns a string like 20150805.gif

它返回true但只有第一帧在gif中

It returns true but only the first frame is in the gif

推荐答案

kCGImagePropertyGIFDelayTime
应该是浮动而不是双倍。

kCGImagePropertyGIFDelayTime should be in float not double.

尝试设置0.125f而不是0.125

try setting 0.125f instead of 0.125

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