seperate iOS project from main project

Pod/Classes/Util/Category/NSString+JsonString.h

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+//
+//  NSString+JsonString.h
+//  Doric
+//
+//  Created by Insomnia on 2019/11/7.
+//
+
+
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface NSString (JsonString)
++ (NSString *)dc_convertToJsonWithDic:(NSDictionary *)dic;
+@end
+
+NS_ASSUME_NONNULL_END

Pod/Classes/Util/Category/NSString+JsonString.m

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+//
+//  NSString+JsonString.m
+//  Doric
+//
+//  Created by Insomnia on 2019/11/7.
+//
+
+#import "NSString+JsonString.h"
+#import "DoricUtil.h"
+
+@implementation NSString (JsonString)
++ (NSString *)dc_convertToJsonWithDic:(NSDictionary *)dic {
+    NSError *err;
+    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:&err];
+    NSString *jsonStr = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
+    
+    if (err) {
+        DoricLog(NSStringFromSelector(_cmd), @"Convert dictionary to json string failed.");
+        return nil;
+    }
+    return jsonStr;
+}
+@end