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[ASDisplayNode] Add assertion to +initialize warning developers who override and do not call super.

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If a developer makes this error, it would prevent calls to key lifecycle methods, such as -layoutSpecThatFits:.
Although the superclasses of ASDisplayNode do not implement +initialize, a super call is added here for consistency.
This commit is contained in:
Hannah Troisi
2016-06-03 20:18:12 -07:00
parent 44c860bfe2
commit c9ac554889
1 changed files with 4 additions and 0 deletions
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4
AsyncDisplayKit/ASDisplayNode.mm
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@@ -178,6 +178,7 @@ static ASDisplayNodeMethodOverrides GetASDisplayNodeMethodOverrides(Class c)
+ (void)initialize
{
[super initialize];
if (self != [ASDisplayNode class]) {
// Subclasses should never override these
@@ -199,8 +200,11 @@ static ASDisplayNodeMethodOverrides GetASDisplayNodeMethodOverrides(Class c)
BOOL instancesOverrideRespondsToSelector = ASSubclassOverridesSelector([NSObject class], self, @selector(respondsToSelector:));
struct ASDisplayNodeFlags flags = GetASDisplayNodeFlags(self, nil);
ASDisplayNodeMethodOverrides methodOverrides = GetASDisplayNodeMethodOverrides(self);
Class initializeSelf = self;
IMP staticInitialize = imp_implementationWithBlock(^(ASDisplayNode *node) {
ASDisplayNodeAssert(node.class == initializeSelf, @"Node class %@ does not have a matching _staticInitialize method; check to ensure [super initialize] is called within any custom +initialize implementations! Overridden methods will not be called unless they are also implemented by superclass %@", node.class, initializeSelf);
node->_flags = (classOverridesRespondsToSelector || instancesOverrideRespondsToSelector) ? GetASDisplayNodeFlags(node.class, node) : flags;
node->_methodOverrides = (classOverridesRespondsToSelector) ? GetASDisplayNodeMethodOverrides(node.class) : methodOverrides;
});