How to retrieve iPhone IDFA from API?

问题

I would like to get the device IDFA. How to get this info from iOS official API ?

回答1:

First of all:

#import <AdSupport/ASIdentifierManager.h> 

If you would like to get it as an NSString, use:

[[[ASIdentifierManager sharedManager] advertisingIdentifier] UUIDString]

So your code might look like this:

NSString *idfaString = [[[ASIdentifierManager sharedManager] advertisingIdentifier] UUIDString];

回答2:

You first have to check if user user has decided to opt out from ad tracking. Only if he allowed it you can use the IDFA.

You can check it by calling isAdvertisingTrackingEnabled method of ASIdentifierManager.

isAdvertisingTrackingEnabled

Check the value of this property before performing any advertising tracking. If the value is NO, use the advertising identifier only for the following purposes: frequency capping, conversion events, estimating the number of unique users, security and fraud detection, and debugging.

The following code snippet shows how to obtain a string value of IDFA.

ObjC

@import AdSupport;

- (NSString *)identifierForAdvertising {
    // Check whether advertising tracking is enabled
    if([[ASIdentifierManager sharedManager] isAdvertisingTrackingEnabled]) {
        NSUUID *identifier = [[ASIdentifierManager sharedManager] advertisingIdentifier];
        return [identifier UUIDString];
    }

    // Get and return IDFA
    return nil;
}

Swift

import AdSupport

func identifierForAdvertising() -> String? {
    // Check whether advertising tracking is enabled
    guard ASIdentifierManager.shared().isAdvertisingTrackingEnabled else {
        return nil
    }

    // Get and return IDFA
    return ASIdentifierManager.shared().advertisingIdentifier.uuidString
}

回答3:

ASIdentifierManager is the official way to garner the Advertising Identification Number from a device running iOS 6+. You can use -[[ASIdentifierManager sharedManager] advertisingIdentifier]; to get it.

回答4:

Get IDFA in Swift:

    import AdSupport

    ...

    let myIDFA: String?
    // Check if Advertising Tracking is Enabled
    if ASIdentifierManager.sharedManager().advertisingTrackingEnabled {
        // Set the IDFA
        myIDFA = ASIdentifierManager.sharedManager().advertisingIdentifier.UUIDString
    } else {
        myIDFA = nil
    }

回答5:

Beginning in iOS 10, when a user enables “Limit Ad Tracking,” the OS will send along the advertising identifier with a new value of “00000000-0000-0000-0000-000000000000.”

As per this article: https://fpf.org/2016/08/02/ios-10-feature-stronger-limit-ad-tracking/

回答6:

Here's a commented helper class in Swift that will give you a nil object for the identifier if the user has turned advertisement tracking off:

import AdSupport

class IDFA {
    // MARK: - Stored Type Properties
    static let shared = IDFA()

    // MARK: - Computed Instance Properties
    /// Returns `true` if the user has turned off advertisement tracking, else `false`.
    var limited: Bool {
        return !ASIdentifierManager.shared().isAdvertisingTrackingEnabled
    }

    /// Returns the identifier if the user has turned advertisement tracking on, else `nil`.
    var identifier: String? {
        guard !limited else { return nil }
        return ASIdentifierManager.shared().advertisingIdentifier.uuidString
    }
}

Just add it to your project (for example in a file named IDFA.swift) and link the AdSupport.framework in your target via the "Linked Frameworks and Libraries" section in the General settings tab.

Then you can use it like this:

if let identifier = IDFA.shared.identifier {
    // use the identifier
} else {
    // put any fallback logic in here
}

回答7:

Swift 3 & 4

var IDFA = String()
if ASIdentifierManager.shared().isAdvertisingTrackingEnabled {
            IDFA = ASIdentifierManager.shared().advertisingIdentifier
}

回答8:

Just to extend Amro's Swift answer, here's similar code wrapped in a method:

import AdSupport

...

func provideIdentifierForAdvertisingIfAvailable() -> String? {
    if ASIdentifierManager.sharedManager().advertisingTrackingEnabled {
      return ASIdentifierManager.sharedManager().advertisingIdentifier?.UUIDString ?? nil
    } else {
      return nil
    }
  }

回答9:

A nicer approach to get the IDFA or nil if tracking is disabled via iOS Setting is using a (private) extension:

import AdSupport

class YourClass {

    func printIDFA() {
        print(ASIdentifierManager.shared().advertisingIdentifierIfPresent)
    }
}

private extension ASIdentifierManager {

    /// IDFA or nil if ad tracking is disabled via iOS system settings
    var advertisingIdentifierIfPresent: String? {
        if ASIdentifierManager.shared().isAdvertisingTrackingEnabled {
            return ASIdentifierManager.shared().advertisingIdentifier.uuidString
        }

        return nil        
}

来源：https://stackoverflow.com/questions/12944504/how-to-retrieve-iphone-idfa-from-api