`Gif`动画内存暴增！

最近要展示一个gif图，大小是274KB，750*1334。

@implementation GifView
{
    CGImageSourceRef gif;
    NSDictionary *gifProperties;
    size_t index;
    size_t count;
    NSTimer *timer;
}

- (id)initWithFrame:(CGRect)frame data:(NSData *)_data{
    self = [super initWithFrame:frame];
    if (self) {
        gifProperties = [NSDictionary dictionaryWithObject:[NSDictionary dictionaryWithObject:[NSNumber numberWithInt:0] forKey:(NSString *)kCGImagePropertyGIFLoopCount]
                                                     forKey:(NSString *)kCGImagePropertyGIFDictionary];
        gif = CGImageSourceCreateWithData((CFDataRef)_data, (CFDictionaryRef)gifProperties);
        count = CGImageSourceGetCount(gif);
        timer = [NSTimer scheduledTimerWithTimeInterval:0.12 target:self selector:@selector(play) userInfo:nil repeats:YES];
        [timer fire];
    }
    return self;
}

-(void)play
{
    index ++;
    index = index%count;
    CGImageRef ref = CGImageSourceCreateImageAtIndex(gif, index, (CFDictionaryRef)gifProperties);
    self.layer.contents = (__bridge id)ref;
}
-(void)removeFromSuperview
{
    [timer invalidate];
    timer = nil;
    [super removeFromSuperview];
}

@end

成功跑起来后，要消耗150+内存！！

想请教一下各位，展示gif有什么优化的方法?

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可以参考下 Twitter，他们将 gif 图转成了 mp4。

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直接用 webview加载不就行了