iOS:add protection for SIGSEGV

doric-iOS/Pod/Classes/Engine/DoricJSEngine.h

@@ -40,7 +40,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)destroyContext:(NSString *)contextId;
 
-- (JSValue *)invokeDoricMethod:(NSString *)method, ...;
+- (JSValue *)invokeDoricMethod:(NSString *)method, ... NS_REQUIRES_NIL_TERMINATION;
 
 - (JSValue *)invokeDoricMethod:(NSString *)method arguments:(va_list)args;
 

doric-iOS/Pod/Classes/Engine/DoricJSEngine.m

@@ -228,7 +228,7 @@ - (void)callbackTimer:(NSTimer *)timer {
         NSDictionary *userInfo = timer.userInfo;
         NSNumber *timerId = [userInfo valueForKey:@"timerId"];
         NSNumber *repeat = [userInfo valueForKey:@"repeat"];
-        
+
         __strong typeof(_self) self = _self;
         @try {
             [self invokeDoricMethod:DORIC_TIMER_CALLBACK, timerId, nil];