Hi all,
I incurred into a change of behavior that is not documented, so I am not sure if it is an issue or it is expected.
In particular, calling class_addMethod started to return false for some UIKit related classes on iOS 14 Beta while on iOS <13.5 was returning true.
A tests that shows the change in behavior, that succeed on iOS 13.5 and fails on iOS 14 Beta is the following:
@import ObjectiveC;
@import UIKit;
@import XCTest;
static BOOL class_addMethodSuccedeed;
static BOOL UINavigationBarDidMoveToWindowCalled;
@interface TestCrashTests : XCTestCase
@end
@implementation TestCrashTests
(void)testClassAddMethod {
		XCTAssertTrue(class_addMethodSuccedeed);
		[[[UINavigationBar alloc] initWithFrame:CGRectZero] didMoveToWindow];
		XCTAssertTrue(UINavigationBarDidMoveToWindowCalled);
}
(void)swizzle:(Class)class methodName:(NSString*)methodName
{
		SEL originalMethod = NSSelectorFromString(methodName);
		SEL newMethod = NSSelectorFromString([NSString stringWithFormat:@"%@%@", @"override_", methodName]);
				[self swizzle:class from:originalMethod to:newMethod];
}
(void)swizzle:(Class)class from:(SEL)original to:(SEL)new
{
		Method originalMethod = class_getInstanceMethod(class, original);
		Method newMethod = class_getInstanceMethod(class, new);
		if (class_addMethod(class, original, method_getImplementation(newMethod), method_getTypeEncoding(newMethod))) {
				class_replaceMethod(class, new, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod));
				class_addMethodSuccedeed = YES;
		} else {
				method_exchangeImplementations(originalMethod, newMethod);
		}
}
(void)load {
		static dispatch_once_t onceToken;
		dispatch_once(&onceToken, ^{
				[self swizzle:[UINavigationBar class] methodName:@"didMoveToWindow"];
				[self swizzle:[UIView class] methodName:@"didMoveToWindow"];
		});
}
@end
@implementation UIView (Swizzle)
(void)override_didMoveToWindow {
		[self override_didMoveToWindow];
}
@end
@implementation UINavigationBar (Swizzle)
(void)override_didMoveToWindow {
		UINavigationBarDidMoveToWindowCalled = YES;
		[self override_didMoveToWindow];
}
@end
This seems, now, to swizzle wrongly methods of a subclass and in fact create an infinite recursive loop.
Any ideas?
adellibovi
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for