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Underscored properties in Swift classes?


Underscored properties in Swift classes?

By : Andrew Box
Date : November 22 2020, 02:42 PM
wish help you to fix your issue These are private variables that Apple uses in their classes (you can declare your own with the private keyword). It is just a convention to use an underscore before their name. It is possible to access them using Key-Value Coding (KVC). In your case, to get the variable, you would do the following: webView.valueForKey("_cancelBarButtonItem") If you want to set them, you can do this: webView.setValue(value, forKey: "_cancelBarButtonItem") where value is the value you want to set it to.
Note: Apple strongly discourages accessing their private variables, and doing so may get your app rejected
code :


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Privacy: Underscored prototype properties or encapsulated variables?

Privacy: Underscored prototype properties or encapsulated variables?


By : bob hurts
Date : March 29 2020, 07:55 AM
like below fixes the issue If you like Crockford's work, I'd suggest watching his JavaScript series where he describes why he avoids using underscores and prefers camelNotation.
http://www.yuiblog.com/crockford/
How to map underscored table columns to camelcased model class properties in ZF2?

How to map underscored table columns to camelcased model class properties in ZF2?


By : user3044483
Date : March 29 2020, 07:55 AM
With these it helps You should update all database column names with the new under_score naming convention, the database adapter will automatically query the database for this information.
Then in order to 'map' the new column_name to object property propertyName the mapper requires an object hydrator.
What do the underscored properties mean when you log a JS object in Chrome Devtools

What do the underscored properties mean when you log a JS object in Chrome Devtools


By : Baijin Yang
Date : March 29 2020, 07:55 AM
help you fix your problem It means that properties are "private", it is developers agreement. See more about it: https://developer.mozilla.org/en-US/Add-ons/SDK/Guides/Contributor_s_Guide/Private_Properties#Using_Prefixes
I don't recommend use these properties, because they can change in next Leaflet version (sometimes as I remember it happens).
What is the difference between underscored methods and non-underscored methods, specifically those that are listed by th

What is the difference between underscored methods and non-underscored methods, specifically those that are listed by th


By : Zain Mumtaz Khan
Date : March 29 2020, 07:55 AM
this will help Differently form other languages (Java, C++), there are no "private" methods in Python (i.e. methods that cannot be called outside of the class that defines them). So, any caller can call internal methods from any object.
Conventionally, you should not call those methods of an object, to avoid unwanted consequences not predicted by the class' programmer.
How iterate through all properties of different classes in Swift?

How iterate through all properties of different classes in Swift?


By : Hani Abu Arab
Date : March 29 2020, 07:55 AM
I wish this help you This is what reflection is for. You can add a property / method to the Car class that list all the properties of the current class, plus those of the superclass. When this property / method is dynamically applied to the subclasses, it will give what you are looking for.
We need an extension to Mirror that returns all properties of the current instance and those of its superclass recursively, taken from Martin R's answer:
code :
extension Mirror {
    func toDictionary() -> [String: Any] {
        var dict = [String: Any]()

        // Attributes of this class
        for attr in self.children {
            if let propertyName = attr.label {
                dict[propertyName] = attr.value
            }
        }

        // Attributes of superclass
        if let superclass = self.superclassMirror {
            for (propertyName, value) in superclass.toDictionary() {
                dict[propertyName] = value
            }
        }

        return dict
    }
}

class Car: CustomDebugStringConvertible {
    // ...

    var debugDescription: String {
        let dict = Mirror(reflecting: self).toDictionary()
        return dict.map { "\($0.key) = \($0.value)" }.joined(separator: "\n")
    }
}
var allClassesArrays = [carrsArray, sportCarsArray, tankerCarsArray]
for car in allClassesArrays.flatMap({ $0 }) {
    print(car.debugDescription, terminator: "\n\n")
}
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