iOS 下拉刷新：VASRefreshControl

VASRefreshControl 簡單的下拉刷新，支持 RACCommand。

Cocoapods:

pod 'VASRefreshControl', :git => 'https://github.com/spbvasilenko/VASRefreshControl.git'

How to use:

1) Create RACCommand, if you need for this:

- (RACCommand *)refreshCommand
{
    if (!_refreshCommand) {
        _refreshCommand = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
            return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {

                dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
                    NSLog(@"Signal execute!");
                    [subscriber sendCompleted];
                });
                return nil;
            }];
        }];
    }
    return _refreshCommand;
}

2) Init VASRefreshControl for your UIScrollView and set RACCommand for execute during refresh:

self.refreshControl = [[VASRefreshControl alloc] initWithLoaderStyle:VASRefreshControlLoaderStyleBlue
                                                                         forScrollView:self.scrollView];
self.refreshControl.rac_command = self.refreshCommand;

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