CTObjectiveCRuntimeAdditions introduces the following new runtime additions:
void class_swizzleSelector(Class class, SEL originalSelector, SEL newSelector);void class_swizzlesMethodsWithPrefix(Class class, NSString *prefix);void class_enumerateMethodList(Class class, CTMethodEnumertor enumerator);Class class_subclassPassingTest(Class class, CTClassTest test);IMP class_replaceMethodWithBlock(Class class, SEL originalSelector, id block);void class_implementPropertyInUserDefaults(Class class, NSString *propertyName, BOOL automaticSynchronizeUserDefaults);void class_implementProperty(Class class, NSString *propertyName, objc_AssociationPolicy associationPolicy);
CTBlockDescription lets you inspect blocks including arguments and compile time features at runtime.
One could use CTBlockDescription for the following test block:
// a test block.
BOOL(^testBlock)(BOOL animated, id object) = ^BOOL(BOOL animated, id object) {
return YES;
};
// allocating a block description
CTBlockDescription *blockDescription = [[CTBlockDescription alloc] initWithBlock:testBlock];
// getting a method signature for this block
NSMethodSignature *methodSignature = blockDescription.blockSignature;
/**
<NSMethodSignature: 0x253f080>
number of arguments = 3
frame size = 12
is special struct return? NO
return value: -------- -------- -------- --------
type encoding (c) 'c'
flags {isSigned}
modifiers {}
frame {offset = 0, offset adjust = 0, size = 4, size adjust = -3}
memory {offset = 0, size = 1}
argument 0: -------- -------- -------- --------
type encoding (@) '@?'
flags {isObject, isBlock}
modifiers {}
frame {offset = 0, offset adjust = 0, size = 4, size adjust = 0}
memory {offset = 0, size = 4}
argument 1: -------- -------- -------- --------
type encoding (c) 'c'
flags {isSigned}
modifiers {}
frame {offset = 4, offset adjust = 0, size = 4, size adjust = -3}
memory {offset = 0, size = 1}
argument 2: -------- -------- -------- --------
type encoding (@) '@'
flags {isObject}
modifiers {}
frame {offset = 8, offset adjust = 0, size = 4, size adjust = 0}
memory {offset = 0, size = 4}
*/MIT
Thanks goes to the Block Implementation Specification and the A2DynamicDelegate project for some good libffi samples and convertion from encodings to libffi types.
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