如何在 Xcode 4 中获取符合特定协议的所有类的列表？
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时间：2020-09-14 23:47:39 来源:igfitidea点击:
How do I get list of all classes conform to certain protocol in Xcode 4?
提问by icespace
I am new to Xcode. I want to know how can I know all classes conform to certain protocol in Xcode 4.3.1? And how can I know all subclasses of one class?
我是 Xcode 的新手。我想知道如何知道所有类都符合 Xcode 4.3.1 中的特定协议？我怎么知道一个类的所有子类？
回答by Kurt Revis
Use the Objective-C runtime functions.
objc_getClassListto get the list ofClassesclass_getSuperclassor the-superclassmethod to walk the superclass chainclass_conformsToProtocolor the-conformsToProtocol:method to check if a class conforms to a protocol
objc_getClassList获取Classes列表class_getSuperclass或-superclass遍历超类链的方法class_conformsToProtocol或-conformsToProtocol:检查类是否符合协议的方法
回答by Denis Mikhaylov
Protocol *protocol = @protocol(YourProtocol);
int numberOfClasses = objc_getClassList(NULL, 0);
Class *classList = malloc(numberOfClasses * sizeof(Class));
numberOfClasses = objc_getClassList(classList, numberOfClasses);
for (int idx = 0; idx < numberOfClasses; idx++)
{
Class class = classList[idx];
if (class_getClassMethod(class, @selector(conformsToProtocol:)) && [class conformsToProtocol:protocol])
{
NSLog(@"%@", NSStringFromClass(class));
}
}
free(classList);
