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runloopworkdistribution's Issues

视觉效果体验问题

我想问一下:对于这种优化,我们可以看到在tracking模式下,cell上面一片空白(或者你放一个比较小的背景占位图),但是当滑动停止,处于default模式了,这个时候渲染图片了,你会发现之前的空白(或占位图)会被填充,感觉视觉上的效果蛮差的。例如我们希望可以获得微信朋友圈或微博那样的体验,有没有更好的优化方案呢?我们抛开高度缓存这些角度,其他角度怎么优化呢?

将 NSTimer 改成 [NSMachPort port] 是否更好

@implementation DWURunLoopWorkDistribution
- (instancetype)init
{
    if ((self = [super init])) {
        _maximumQueueLength = 30;
        _tasks = [NSMutableArray array];
        _tasksKeys = [NSMutableArray array];
//        _timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(_timerFiredMethod:) userInfo:nil repeats:YES];
         // 如果不加延迟会导致启动黑屏,  可能是由于启动 App 时, 无法正常 Mode 切换的原因;
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.01 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            NSRunLoop* runLoop = [NSRunLoop currentRunLoop];
            [runLoop addPort:[NSMachPort port] forMode:NSDefaultRunLoopMode];
            [runLoop run];
        });

    }
    return self;
}

改造成uicollection view使用加载图片会出现跳动

我将这个Demo转换成给collectionview 使用,然后从网络上下载图片,发现在上下滚动collectionview的过程中,原本在item = 1位置的图片,变到item = 2的位置,item = 2 的图片变到item = 1 的位置,也就是两个图片互相交换了位置,然后再滑动collectionview的时候又互相交换位置了,一直滚动就一直重复出现这个问题。

图片不显示

如果已进入页面不滑动页面就不会显示图片,

请求大神答复一个疑问

为什么我认为,这个不是每次RunLoop结束前执行一次任务,而且在一次RunLoop结束的前下执行了所有在tasks中的任务?
如果只执行一次的话,那么RunLoop休眠,页面保持静止,应该只加载一张图的啊。

while (result == NO && runLoopWorkDistribution.tasks.count) {
    DWURunLoopWorkDistributionUnit unit  = runLoopWorkDistribution.tasks.firstObject;
    result = unit();
    [runLoopWorkDistribution.tasks removeObjectAtIndex:0];
    [runLoopWorkDistribution.tasksKeys removeObjectAtIndex:0];
}

这个不是一次执行完的吗?

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