iOS7: UICollectionView appearing under UINavigationBar

问题

I've been building on iOS 7 for a while now but I've yet to get this solved, I have a number of views with autolayout enabled that were created in Storyboard and are displayed with a standard UINavigationController. The majority are fine, but the ones based on UICollectionView always place themselves under the navigation bar, unless I set the translucency to NO. I've tried the edgesExtended trick but that doesn't seem to solve it, I don't necessarily mind having the translucency off but I'd like to solve it cleaner.

回答1:

I had this problem before, just set the edge insents of the collection view with a top margin:

 [self.myCollectionVC.collectionView setContentInset:UIEdgeInsetsMake(topMargin, 0, 0, 0)];

Where topMargin is the size of the nav bar, or whatever point you want the collection to start scrolling.

In this way, your collection view will start scrolling just below the navigation bar, and at the same time it will fill the whole screen and you will see it if your nav bar is translucent.

回答2:

FYI if your UICollectionView is the root view in your view controller's hierarchy and your view controller has automaticallyAdjustsScrollViewInsets set to YES (this is the default), then the contentInset should update automatically.

However, the scrollview's contentInset is only automatically updated if your scrollview (or tableview/collectionview/webview btw) is the first view in their view controller's hierarchy.

I often add a UIImageView first in my hierarchy in order to have a background image. If you do this, you have to manually set the edge insets of the scrollview in viewDidLayoutSubviews:

- (void) viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];
    CGFloat top = self.topLayoutGuide.length;
    CGFloat bottom = self.bottomLayoutGuide.length;
    UIEdgeInsets newInsets = UIEdgeInsetsMake(top, 0, bottom, 0);
    self.collectionView.contentInset = newInsets;

}

回答3:

I had this problem after ios 11, just set the contentInsetAdjustmentBehavior of UICollectionView to never:

self.collectionView.contentInsetAdjustmentBehavior = .never

回答4:

I am using swift and xcode 7.3.1. I solved it by going to story board and selecting my Navigation Controller and then unchecking "Extend Edges" "Under Top Bards".

回答5:

-(void) viewDidLoad{
    [super viewDidLoad];
    self.automaticallyAdjustsScrollViewInsets = NO; //added  important
} 

- (void) viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];
    CGFloat top = self.topLayoutGuide.length;
    CGFloat bottom = self.bottomLayoutGuide.length;
    UIEdgeInsets newInsets = UIEdgeInsetsMake(top, 0, bottom, 0);
    self.collectionView.contentInset = newInsets;

}

来源：https://stackoverflow.com/questions/18896210/ios7-uicollectionview-appearing-under-uinavigationbar

标签

ios

uinavigationbar

ios7