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Question

Actually this is a simple question with maybe not an answer for a central solution.

I would like a way to monitor in a central way every UIView start-finish loading to get metrics of the application.

I can see that viewWillLoad doesn't exist anyway in the UIViewController class and viewWillAppear is not something that it could serve the purpose.

Is this feasible in any way? I'm thinking of searching every UIView inherited class in the application and inject code somehow, but as I said I will need two methods. Or maybe inject code to a protocol that already exists in the UIView class?

Any thoughts?

Regards.

Solution

Is CLI an option? If so, check out "xe host-vm-list" or "xe vm-list" depending on your XenServer version.

Comments

[drewag]

do you only want to track the loading of root views of every view controller, or literally every view (therefore subviews of every view as well)?

[George Taskos]

The more the better, but I would like to hear what solution you have in mind.

[Jack Cox]

If you're desperate to know when any UIViewController is loaded you could method swizzle the viewDidLoad method of UIViewController and then every single time that is called your code would be called first to do the analytics, then your code would need to call the original implementation. That's pretty brute force. I would take a more delicate, but labor intensive approach and subclass UIViewController to do the logging and have all of your view controllers inherit from the sub-classed UIViewController.

[George Taskos]

I want to measure the UIViews of all the UIViewControllers

[A'sa Dickens]

as long as custom views don't polymorphize their super methods, then it should work the same, if i'm not mistaken.

[drewag]

Ya that is what I was trying to get across with the custom initializers. If additional initialization is happening in custom views outside of initWithFrame, then it won't be measured by simply swizzling the initWithFrameMethod.

[George Taskos]

So you mean I can swizzle the -initWithFrame of every UIView inherited class and if this class does not implement the -initWithFrame I will be able to measure it. Hmm, this solution seems interesting, I should create a sample application and test behavior.

[drewag]

You only have to swizzle -initWithFrame on the UIView class. But you will be missing initialization in custom subclasses if they override initWithFrame and do other initialization. It will still track the regular initWithFrame time but not any of the extra initialization. However, I recommend going the viewController route because I can't imagine all views being a useful statistic as it will include the time for individual subviews as well as views that contain many vies. Plus the time it takes to init a view is too close to the time it would take to track it.

[George Taskos]

True, in the -loadView method I can measure all the views loaded in the UIViewController at once. Maybe there is better since knowing the UIViewController that might take too much time to load you then know where to look for debugging purposes.