ios - 创建 GIF 在 iOS 7 上工作，在 iOS 8 上中断

我有一些相当简单的代码，可以从一组 UIImage 中创建 GIF 图像。 它在 iOS7 上运行良好。在 iOS8 上创建了一个文件，但它以某种方式损坏(在设备上或下载到桌面时不起作用)。下面是示例代码:

...

float frameTime = (1/(fps * speed));

NSString *fileOutput = [NSString stringWithFormat"%@/%ld", NSTemporaryDirectory(), time(NULL)];

CGImageDestinationRef destination = CGImageDestinationCreateWithURL((__bridge CFURLRef)[NSURL fileURLWithPath:fileOutput],kUTTypeGIF,[images count],NULL);

NSDictionary *frameProperties = [NSDictionary dictionaryWithObjectsAndKeys:[NSDictionary dictionaryWithObject:[NSNumber numberWithFloat:frameTime] forKeyNSString *)kCGImagePropertyGIFDelayTime],(NSString *)kCGImagePropertyGIFDictionary,kCFBooleanFalse,kCGImagePropertyHasAlpha,[NSNumber numberWithFloat:1.0],kCGImageDestinationLossyCompressionQuality, nil];

NSMutableDictionary *gifProps = [NSMutableDictionary dictionary];
[gifProps setObject:[NSNumber numberWithBool:NO] forKeyNSString *)kCGImagePropertyGIFHasGlobalColorMap];
[gifProps setObject:[NSNumber numberWithInt:0] forKeyNSString*)kCGImagePropertyGIFLoopCount];
[gifProps setObject:[NSNumber numberWithBool:NO] forKeyNSString *)kCGImagePropertyHasAlpha];
[gifProps setObject:[NSNumber numberWithFloat:1.0] forKeyNSString*)kCGImageDestinationLossyCompressionQuality];

NSDictionary *gifProperties = [ NSDictionary dictionaryWithObject:gifProps forKeyNSString*) kCGImagePropertyGIFDictionary ];

for (int i = 0; i<[images count]; i++)
{
    UIImage *im = [UIImage imageNamed:[images objectAtIndex:i]];

    @autoreleasepool
    {
        CGImageDestinationAddImage(destination, im.CGImage, (__bridge CFDictionaryRef)frameProperties);
        im = nil;
    }
}

CGImageDestinationSetProperties(destination, (__bridge CFDictionaryRef)gifProperties);
CGImageDestinationFinalize(destination);
CFRelease(destination);

...

没有警告消息，执行时也没有错误。 什么可能导致问题？

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Best Answer-推荐答案

Apple 确认这是一个 iOS8 错误，已提交 (18512475)。

关于ios - 创建 GIF 在 iOS 7 上工作，在 iOS 8 上中断，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26060699/