iPhone上的用于插入设备的API

Question

该API用于与插接设备（例如此应用程序）配合使用的东西： 方形iphone扫描仪 ？CocoaTouch，一些来自Foundation？

Answer 1

ExternalAccessory.framework .

Oops. Square doesn't use ExternalAccessory, but some kind of custom interface through the headphone jack, as explained by @kubi .

The relevant interface looks like this:

__attribute__((visibility("hidden")))
@interface SKSquareInterface : NSObject {
@private
    ? delegate;
    ? queue;
    ? state;
}
@property(assign) ? XXEncryptedProperty_6b644;
@property(assign) ? XXEncryptedProperty_6a1bc;
@property(assign) ? XXEncryptedProperty_77a22;
@property(assign) ? XXEncryptedProperty_77a39;
@property(assign) ? XXEncryptedProperty_77a60;
@property(assign) ? XXEncryptedProperty_77800;
@property(assign) ? XXEncryptedProperty_7780c;
+(?)sharedInstance;
-(?)init;
-(?)dealloc;
-(?)parseState;
-(?)triggered;
-(?)dcOffset;
-(?)shouldStartWhenCapable;
-(?)setShouldStartWhenCapable:(?)startWhenCapable;
-(?)start;
-(?)stop;
-(?)isAttached;
-(?)_reset;
-(?)_stop;
-(?)_initializeQueues;
-(?)_isAudioQueueRunning;
-(?)_listenForSwipe:(?)swipe numSamps:(?)samps;
-(?)_tryToStartAudioInterface;
-(?)_tryToStopAudioInterface;
-(?)_notifyDelegateDidBeginSwipe;
-(?)_notifyDelegateSwipeFailed;
-(?)_notifyDelegateOfRawData:(?)rawData;
-(?)_notifyDelegateOfRawDataOnMainThread:(?)rawDataOnMainThread;
-(?)_notifyDelegateSwipedPaymentCard:(?)card;
-(?)_notifyDelegateSwipedPaymentCardOnMainThread:(?)thread;
-(?)state;
-(?)delegate;
-(?)setDelegate:(?)delegate;
@end

which suggest it directly parse the input from AudioQueue .

Answer 2

Square works through the headphone jack, so it doesn't use the External Accessory framework. External accessories on the iPhone are notoriously difficult to do, which is why barely any manufacturers are creating products.

http://www.wired.com/gadgetlab/2010/01/wither-the-dongleware

I can count on one finger the number of third party devices I've seen that communicate through the dock connector on the iPhone.