SVPullToRefresh自定义视图导致layoutIfNeeded进入无限循环

Question

I tried using custom views for the SVPullToRefresh but I've stumbled upon weird issue. I've made the demo project to illustrate the issue: https://github.com/gaks/SVRefreshProblem

The project is simply one UITableViewController with a TableView and the xib file with custom refresh bar view. The SVPullToRefresh is added to the tableView via the IBOutlet in the viewDidLoad: https://github.com/gaks/SVRefreshProblem/blob/master/SVRefreshProblem/DemoViewController.m

There is also a code that loads the RefreshBarView from the xib file and sets it as a custom view for SVPullToRefresh (for 'loading' state only for illustration):

RefreshBarView* refreshBarView = [[[NSBundle mainBundle] loadNibNamed:@"RefreshBarView" owner:self options:nil] objectAtIndex:0];
refreshBarView.bounds = CGRectMake(0, 0, 320, 60);

[[tableView pullToRefreshView] setCustomView:refreshBarView forState:SVPullToRefreshStateLoading];

The issue is that when you pull the table view to trigger the refresh it goes into infinite loop and eat-all-available-memory state after calling [self layoutIfNeeded] in the - (void)setState:(SVPullToRefreshState)newState . As far as I was able to debug it keeps calling - (void)layoutSubviews over and over.

What's weird is that when you open the xib file: https://github.com/gaks/SVRefreshProblem/blob/master/SVRefreshProblem/SVPullToRefresh/RefreshBarView.xib ... and remove the label from the view - it works just fine (except you have an empty view).

What am I doing wrong?

Answer 1

Loading from nibs is for ViewControllers, not views proper. You can try to do this programmatically which will work :

    UIView *v = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 60)];
    [v setBackgroundColor:[UIColor grayColor]];
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320, 60)];
    [label setText:@"asdf"];
    [v addSubview:label];
    [[tableView pullToRefreshView] setCustomView:v forState:SVPullToRefreshStateLoading];

Answer 2

尝试在笔尖中关闭“使用自动布局”。