nsmutabledictionary

AppDelegate.m

    
    #import "AppDelegate.h"

    @implementation AppDelegate

    - (void)applicationDidFinishLaunching:(NSNotification *)aNotification
    {
      NSString *mainPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Desktop"];
      NSString *plist1 = [mainPath stringByAppendingString:@"plist1.plist"];
      NSString *plist2 = [mainPath stringByAppendingString:@"plist2.plist"];
    
      NSMutableDictionary *dict1 = [NSMutableDictionary dictionaryWithContentsOfFile:plist1];
      NSMutableDictionary *dict2 = [NSMutableDictionary dictionaryWithContentsOfFile:plist2];
    
      [dict1[@"Main"] addEntriesFromDictionary:dict2[@"Main"]];
	    NSLog(@"%@",dict1);
	  }
	  
	  /*
	  // output is:  {
                  Main =     {
                      DataStorage2 = {
                        A = "";
                        B = "";
                        C = "";
                          };
                      };
                  }
	  */
	  
	  @end

plist1.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Main</key>
	<dict>
		<key>DataStorage1</key>
		<dict>
			<key>A</key>
			<string></string>
			<key>B</key>
			<string></string>
			<key>C</key>
			<string></string>
		</dict>
	</dict>
</dict>
</plist>

plist2.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Main</key>
	<dict>
		<key>DataStorage2</key>
		<dict>
			<key>A</key>
			<string></string>
			<key>B</key>
			<string></string>
			<key>C</key>
			<string></string>
		</dict>
	</dict>
</dict>
</plist>