_Nullable -> nullable

src/objective-c/GRPCClient/private/GRPCCronetChannelFactory.h

@@ -24,12 +24,12 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface GRPCCronetChannelFactory : NSObject<GRPCChannelFactory>
 
-+ (instancetype _Nullable)sharedInstance;
++ (nullable instancetype)sharedInstance;
 
-- (grpc_channel *_Nullable)createChannelWithHost:(NSString *)host
-                                     channelArgs:(NSDictionary *_Nullable)args;
+- (nullable grpc_channel *)createChannelWithHost:(NSString *)host
+                                     channelArgs:(nullable NSDictionary *)args;
 
-- (instancetype _Nullable)init NS_UNAVAILABLE;
+- (nullable instancetype)init NS_UNAVAILABLE;
 
 @end
 

src/objective-c/GRPCClient/private/GRPCInsecureChannelFactory.h

@@ -23,12 +23,12 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface GRPCInsecureChannelFactory : NSObject<GRPCChannelFactory>
 
-+ (instancetype _Nullable)sharedInstance;
++ (nullable instancetype)sharedInstance;
 
-- (grpc_channel *_Nullable)createChannelWithHost:(NSString *)host
-                                     channelArgs:(NSDictionary *_Nullable)args;
+- (nullable grpc_channel *)createChannelWithHost:(NSString *)host
+                                     channelArgs:(nullable NSDictionary *)args;
 
-- (instancetype _Nullable)init NS_UNAVAILABLE;
+- (nullable instancetype)init NS_UNAVAILABLE;
 
 @end
 

src/objective-c/GRPCClient/private/GRPCSecureChannelFactory.h

@@ -23,15 +23,15 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface GRPCSecureChannelFactory : NSObject<GRPCChannelFactory>
 
-+ (instancetype _Nullable)factoryWithPEMRootCertificates:(NSString *_Nullable)rootCerts
-                                              privateKey:(NSString *_Nullable)privateKey
-                                               certChain:(NSString *_Nullable)certChain
++ (nullable instancetype)factoryWithPEMRootCertificates:(nullable NSString *)rootCerts
+                                              privateKey:(nullable NSString *)privateKey
+                                               certChain:(nullable NSString *)certChain
                                                    error:(NSError **)errorPtr;
 
-- (grpc_channel *_Nullable)createChannelWithHost:(NSString *)host
-                                     channelArgs:(NSDictionary *_Nullable)args;
+- (nullable grpc_channel *)createChannelWithHost:(NSString *)host
+                                     channelArgs:(nullable NSDictionary *)args;
 
-- (instancetype _Nullable)init NS_UNAVAILABLE;
+- (nullable instancetype)init NS_UNAVAILABLE;
 
 @end
 

src/objective-c/tests/APIv2Tests/APIv2Tests.m

@@ -81,20 +81,20 @@ static const NSTimeInterval kTestTimeout = 16;
   return self;
 }
 
-- (void)receivedInitialMetadata:(NSDictionary *_Nullable)initialMetadata {
+- (void)receivedInitialMetadata:(NSDictionary *)initialMetadata {
   if (self->_initialMetadataCallback) {
     self->_initialMetadataCallback(initialMetadata);
   }
 }
 
-- (void)receivedRawMessage:(GPBMessage *_Nullable)message {
+- (void)receivedRawMessage:(GPBMessage *)message {
   if (self->_messageCallback) {
     self->_messageCallback(message);
   }
 }
 
-- (void)closedWithTrailingMetadata:(NSDictionary *_Nullable)trailingMetadata
-                             error:(NSError *_Nullable)error {
+- (void)closedWithTrailingMetadata:(NSDictionary *)trailingMetadata
+                             error:(NSError *)error {
   if (self->_closeCallback) {
     self->_closeCallback(trailingMetadata, error);
   }