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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.
38 lines
819 B
Objective-C
38 lines
819 B
Objective-C
//
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// AsyncViewController.m
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// Sample
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//
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// Created by Scott Goodson on 9/26/15.
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// Copyright © 2015 Facebook. All rights reserved.
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//
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#import "AsyncViewController.h"
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#import "RandomCoreGraphicsNode.h"
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@implementation AsyncViewController
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- (instancetype)init
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{
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if (!(self = [super initWithNode:[[RandomCoreGraphicsNode alloc] init]])) {
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return nil;
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}
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self.neverShowPlaceholders = YES;
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self.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:0];
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return self;
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}
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- (void)viewWillAppear:(BOOL)animated
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{
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// FIXME: This is only being called on the first time the UITabBarController shows us.
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[super viewWillAppear:animated];
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}
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- (void)viewDidDisappear:(BOOL)animated
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{
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[self.node recursivelyClearContents];
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[super viewDidDisappear:animated];
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}
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@end
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