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a58844379c
This provides internal features on _ASAsyncTransaction and ASDisplayNode to facilitate implementing public API that allows clients to choose if they would prefer to block on the completion of unfinished rendering, rather than allow a placeholder state to become visible. The internal features are: -[_ASAsyncTransaction waitUntilComplete] -[ASDisplayNode recursivelyEnsureDisplay] Also provided are two such implementations: -[ASCellNode setNeverShowPlaceholders:], which integrates with both Tables and Collections -[ASViewController setNeverShowPlaceholders:], which should work with Nav and Tab controllers. Lastly, on ASDisplayNode, a new property .shouldBypassEnsureDisplay allows individual node types to exempt themselves from blocking the main thread on their display. By implementing the feature at the ASCellNode level rather than ASTableView & ASCollectionView, developers can retain fine-grained control on display characteristics. For example, certain cell types may be appropriate to display to the user with placeholders, whereas others may not. Follow-up work will include unit tests, revisiting names, and the header locations of definitions.
92 lines
2.7 KiB
Objective-C
92 lines
2.7 KiB
Objective-C
/* This file provided by Facebook is for non-commercial testing and evaluation
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* purposes only. Facebook reserves all rights not expressly granted.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#import <AsyncDisplayKit/AsyncDisplayKit.h>
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#import <AsyncDisplayKit/ASAssert.h>
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#import "AsyncTableViewController.h"
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#import "RandomCoreGraphicsNode.h"
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@interface AsyncTableViewController () <ASTableViewDataSource, ASTableViewDelegate>
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{
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ASTableView *_tableView;
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}
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@end
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@implementation AsyncTableViewController
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#pragma mark -
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#pragma mark UIViewController.
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- (instancetype)init
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{
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if (!(self = [super init]))
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return nil;
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_tableView = [[ASTableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
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_tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
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_tableView.asyncDataSource = self;
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_tableView.asyncDelegate = self;
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ASRangeTuningParameters tuningParameters;
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tuningParameters.leadingBufferScreenfuls = 0.5;
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tuningParameters.trailingBufferScreenfuls = 1.0;
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[_tableView setTuningParameters:tuningParameters forRangeType:ASLayoutRangeTypePreload];
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[_tableView setTuningParameters:tuningParameters forRangeType:ASLayoutRangeTypeRender];
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self.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemFeatured tag:0];
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self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRedo
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target:self
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action:@selector(reloadEverything)];
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return self;
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}
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- (void)reloadEverything
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{
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[_tableView reloadData];
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}
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- (void)viewDidLoad
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{
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[super viewDidLoad];
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[self.view addSubview:_tableView];
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}
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- (void)viewWillLayoutSubviews
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{
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_tableView.frame = self.view.bounds;
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}
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- (BOOL)prefersStatusBarHidden
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{
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return YES;
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}
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#pragma mark -
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#pragma mark ASTableView.
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- (ASCellNode *)tableView:(ASTableView *)tableView nodeForRowAtIndexPath:(NSIndexPath *)indexPath
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{
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RandomCoreGraphicsNode *elementNode = [[RandomCoreGraphicsNode alloc] init];
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elementNode.preferredFrameSize = CGSizeMake(320, 100);
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return elementNode;
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}
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- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
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{
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return 100;
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}
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@end
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