Xcode9.3, what is the difference between block body self- > and direct self call?
Why does Apple officially recommend using self-? what is the principle?
-(MJRefreshNormalHeader *) refreshHeader {
if (!_refreshHeader) {
_refreshHeader = [MJRefreshNormalHeader headerWithRefreshingBlock:^{
// footer
[_homeCollectionView.mj_footer resetNoMoreData];
[self requestHotProducts];
}];
_refreshHeader.lastUpdatedTimeLabel.hidden = YES;
_refreshHeader.stateLabel.hidden = YES;
_refreshHeader.hidden = NO;
}
return _refreshHeader;}