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NSCacheDelegate
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The delegate of an NSCache object implements this protocol to perform specialized actions when an object is about to be evicted or removed from the cache.
NSCache对象的代理，实现该协议，当对象即将被驱逐或从缓存中移除时，执行特定动作。
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NSCoding
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The NSCoding protocol declares the two methods that a class must implement so that instances of that class can be encoded and decoded.
NSCoding协议声明了两个为了使类实例可以编码和解码所必须实现的方法。
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NSCopying
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The NSCopying protocol declares a method for providing functional copies of an object.
NSCopying协议声明了对象复制功能副本所需要提供的一个方法。
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NSDecimalNumberBehaviors
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The NSDecimalBehaviors protocol declares three methods that control the discretionary aspects of working with NSDecimalNumber objects.
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NSDiscardableContent
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You implement this protocol when a class’s objects have subcomponents that can be discarded when not being used, thereby giving an application a smaller memory footprint.
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NSErrorRecoveryAttempting
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NSExtensionRequestHandling
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The NSExtensionRequestHandling protocol provides a life cycle hook into an app extension.
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NSFastEnumeration
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The fast enumeration protocol NSFastEnumeration must be adopted and implemented by objects used in conjunction with the for language construct used in conjunction with Cocoa objects.
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NSFileManagerDelegate
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The NSFileManagerDelegate protocol defines optional methods for managing operations involving the copying, moving, linking, or removal of files and directories.
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NSFilePresenter
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The NSFilePresenter protocol should be implemented by objects that allow the user to view or edit the content of files or directories.
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NSKeyValueCoding
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NSKeyValueObserving
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NSKeyedArchiverDelegate
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The NSKeyedArchiverDelegate protocol defines the optional methods implemented by delegates of NSKeyedArchiverobjects.
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NSKeyedUnarchiverDelegate
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The NSKeyedUnarchiverDelegate protocol defines the optional methods implemented by delegates of NSKeyedUnarchiver objects.
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NSLocking
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The NSLocking protocol declares the elementary methods adopted by classes that define lock objects.
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NSMachPortDelegate
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The NSMachPortDelegate protocol defines the optional methods implemented by delegates of NSMachPort objects.
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NSMetadataQueryDelegate
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The NSMetadataQueryDelegate protocol defines the optional methods implemented by delegates of NSMetadataQueryobjects.
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NSMutableCopying
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The NSMutableCopying protocol declares a method for providing mutable copies of an object.
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NSNetServiceBrowserDelegate
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The NSNetServiceBrowserDelegate protocol defines the optional methods implemented by delegates of NSNetServiceBrowser objects.
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NSNetServiceDelegate
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The NSNetServiceDelegate protocol defines the optional methods implemented by delegates of NSNetService objects.
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NSObject
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NSPortDelegate
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The NSPortDelegate protocol defines the optional methods implemented by delegates of NSPort objects.
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NSSecureCoding
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Conforming to the NSSecureCoding protocol indicates that an object handles encoding and decoding instances of itself in a manner that is robust against object substitution attacks.
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NSStreamDelegate
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The NSStreamDelegate protocol defines the optional methods implemented by delegates of NSStream objects.
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NSURLAuthenticationChallengeSender
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The NSURLAuthenticationChallengeSender protocol represents the interface that the sender of an authentication challenge must implement.
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NSURLConnectionDataDelegate
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The NSURLConnectionDataDelegate protocol describes methods that should be implemented by the delegate for an instance of the NSURLConnection class.
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NSURLConnectionDelegate
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The NSURLConnectionDelegate protocol defines methods common to the NSURLConnectionDataDelegate and NSURLConnectionDownloadDelegate protocols.
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NSURLConnectionDownloadDelegate
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The NSURLConnectionDownloadDelegate protocol describes methods that should be implemented by the delegate of instances of NSURLConnection created using Newsstand Kit’s downloadWithDelegate: method.
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NSURLProtocolClient
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The NSURLProtocolClient protocol provides the interface used by NSURLProtocol subclasses to communicate with the URL loading system.
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NSURLSessionDataDelegate
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The NSURLSessionDataDelegate protocol defines the methods that a delegate of an NSURLSession object can implement to handle task-level events specific to data tasks and upload tasks.
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NSURLSessionDelegate
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The NSURLSessionDelegate protocol describes the methods that NSURLSession objects call on their delegates to handle session-level events.
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NSURLSessionDownloadDelegate
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The NSURLSessionDownloadDelegate protocol defines delegate methods that you should implement when using NSURLSession download tasks.
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NSURLSessionTaskDelegate
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The NSURLSessionTaskDelegate protocol defines the task-specific delegate methods that you should implement when working with any type of NSURLSession task.
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NSUserActivityDelegate
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An object conforming to the NSUserActivityDelegate protocol works with an NSUserActivity object, which encapsulates the state of a user activity in an application on a particular device and enables the same activity to be continued on another device.
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NSXMLParserDelegate
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The NSXMLParserDelegate protocol defines the optional methods implemented by delegates of NSXMLParser objects.
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