How to identify custom classes vs Framework Classes in Objective-C - ios

Question

I am working on an Analytics Project by Swizzling UIViewController methods viewDidAppear and viewDidAppear, code snippet as follows,
- (void) swizzledViewDidAppear : (BOOL)animated {
if ([UA isAppInitialized]) { // Check if Analytics Initialized
if ([[self class] isSubclassOfClass:[UIViewController class]]) {
[UA startPage:[NSString stringWithFormat:#"%#", NSStringFromClass ([self class])]];
}
}
[self swizzledViewDidAppear:animated];
}
- (void) swizzledViewDidDisappear : (BOOL)animated {
if ([UA isAppInitialized]) { // Check if Analytics Initialized
if ([[self class] isSubclassOfClass:[UIViewController class]]) {
[UA endPage:[NSString stringWithFormat:#"%#", NSStringFromClass ([self class])]];
}
}
[self swizzledViewDidDisappear:animated];
}
This is the code snippet where I want to track only the Custom ViewController, ex: MyViewController or FooViewController...etc and not Framework related classes like UICompatibilityInputViewController, UIInputWindowController...etc.
Please let me know how can I achieve this. I tried to check for Subclass but still at one point Framework classes are getting recorded.
Thanks,
Vijay

Answer 1

you can get a class's NSBundle and check if that bundle is yours.
swift example using an extension:
//code
extension NSObject {
static var isOurClass: Bool {
let appBundle = Bundle.main
let clsBundle = Bundle(for: self.self);
return clsBundle.bundlePath.hasPrefix(appBundle.bundlePath)
}
}
//test
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
print("appdelegate class ours? \(AppDelegate.isOurClass)")
print("NSString class ours? \(NSString.isOurClass)")
return true
}
}
basic objc example:
#import <Foundation/Foundation.h>
#interface T : NSObject
#end
#implementation T
#end
int main(int argc, char *argv[]) {
#autoreleasepool {
NSBundle *bundleOfApp = [NSBundle mainBundle];
NSLog(#"%#", bundleOfApp.bundlePath);
//ours
T *t = [T new];
NSBundle *bundleOfT = [NSBundle bundleForClass:t.class];
NSLog(#"%#", bundleOfT.bundlePath);
if([bundleOfT.bundlePath hasPrefix:bundleOfApp.bundlePath]) {
NSLog(#"ours");
}
//theirs
bundleOfT = [NSBundle bundleForClass:NSString.class];
NSLog(#"%#", bundleOfT.bundlePath);
if([bundleOfT.bundlePath hasPrefix:bundleOfApp.bundlePath]) {
}
else {
NSLog(#"theirs");
}
}
}

Answer 2

In this case you have make instance of your class like and check it like
MyViewController *myVcntrl = [[MyViewController alloc]init];
if ([myVcntrl isKindOfClass:[MyViewController class]]) {
NSLog(#"Class is of MyViewController type");
}
else {
NSLog(#"Not of MyViewController type");
}

Answer 3

I was swizzling viewDidLoad, loadView and awakeFromNib for measuring load times and there is some strange behavior I've noticed.
For framework classes like UIInputWindowController, UIKeyboardCandidateGridCollectionViewController : awakeFromNib or loadView doesn't get called. They immediately appear after viewDidLoad has been called.
So the following lines of codes:
- (void)swizzled_awakeFromNib
{
NSLog(#"*** Awake from nib %#", NSStringFromClass(self.class));
[self swizzled_awakeFromNib];
}
- (void)swizzled_viewDidLoad
{
NSLog(#"*** View did load %#", NSStringFromClass(self.class));
[self swizzled_viewDidLoad];
}
- (void)swizzled_loadView
{
NSLog(#"*** Load view %#", NSStringFromClass(self.class));
[self swizzled_loadView];
}
Prints:
*** Awake from nib UINavigationController
*** View did load UINavigationController
*** Load view MyLoginViewController
*** View did load UIInputWindowController
*** View did load UIKeyboardCandidateGridCollectionViewController
*** View did load UIInputWindowController
*** View did load UIApplicationRotationFollowingControllerNoTouches
*** View did load MyLoginViewController
So maybe you can add a property to your category and set it to YES if awakeFromNib and/or loadView has called. Then check that bool in your viewDidLoad method to see if its a framework class.