Logging the class name of all UIViewControllers in a project

Question

We have received a HUGE project from outsourcing that we are trying to \"repair\". There are hundreds of view controllers within the project. Our goal is to

Answer 1

You can use method swizzling. Here is a nice guide: http://nshipster.com/method-swizzling/

Answer 2

Does the app use Navigation controllers to display the View Controllers? If so, you can use the NavigationController's methods to report the current controller:

    - (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
    {
        [self reportNewController:viewController];
    }

    - (void) reportNewController:(UIViewController *)viewController
    {
        NSString *name = viewController.title;
            NSLog(@"Name is %@",name);
    }

Answer 3

Here is a solution to print the current view controller class name when it appears, in the console:

• Create a Symbolic Breakpoint in Xcode
• for Symbol, add -[UIViewController viewWillAppear:]
• for Action, add a Debugger Command and the following expression:
• expr -- (void) printf("

Answer 4

Do the view controllers share a common base class? if so you could just put it there in the base class' implementation of [viewDidAppear:]. If they do not share a common base, then perhaps that would be a worthwhile task as it could be useful anyways going forwards (common analytics code, etc.)

Answer 5

The answer is to swizzle the methods! Here is what we came up with:

#import "UIViewController+Logging.h"
#import <objc/runtime.h>

@implementation UIViewController (Logging)

-(void)swizzled_viewDidAppear:(BOOL)animated
{
    NSLog(@"Current View Class: %@", NSStringFromClass(self.class));
    [self swizzled_viewDidAppear:animated];
}

+ (void)load
{
    Method original, swizzled;

    original = class_getInstanceMethod(self, @selector(viewDidAppear:));
    swizzled = class_getInstanceMethod(self, @selector(swizzled_viewDidAppear:));

    method_exchangeImplementations(original, swizzled);

}
@end

Answer 6

You can do a application wide find and replace from Xcode, but it won't necessarily find every case (but neither would the approaches that you tried). You could look for "[super viewDidLoad];" and replace with "[super viewDidLoad]; NSLog(@"Current View Class: %@", NSStringFromClass(self.class));"