用键B的字典中相同NSarray中的字符串替换键A中的字典NSarray中的NSString部分

Question

I have an array of dictionary in the following format.

mainArray[0] = { "key1" : "aText", "key2" :"Text to replace A" }
mainArray[1] = { "key1" : "bText", "key2" :"Text to replace B" }

and so on.

I have an nsstring which can contain any random text. But if there is an occurrence of "aText" in the string it has to be replaced with the corresponding key2 value as "Text to replace A" and similarly for the rest of the array.

How can this be done just by using nspredicates / with out any looping?

NOTE:

My current solution is as follows:

NSArray arrayForKey1 = [mainArray valueForKey:@"key1"]; 
NSArray arrayForKey2 = [mainArray valueForKey:@"key2"]; 

for (int i = 0; i < mainArray.count; i ++) { 
   MyString = [MyString stringByReplacingOccurrencesOfString : [arrayForKey1 objectAtIndex:i]
                                                  withString : [arrayForKey2 objectAtIndex:i]
                                                     options : NSCaseInsensitiveSearch
                                                       range : NSMakeRange(0, MyString.length)
              ]; 
}

Answer 1

The key1 and key2 keys are useless if you want to map aText to Text to replace a .

What you could have is:

NSMutableString *input = [@"aText apple bText banana cText carrot" mutableCopy];
NSDictionary *replacements = { @"aText" : @"Text to replace a",
                               @"bText" : @"Text to replace b",
                               @"cText" : @"Text to replace c" };


for (NSString *rep in replacements)
{
    [input replaceOccurrencesOfString:rep withString:[replacements objectForKey:rep]];
}

This will work as long as the replacement strings do not contain any of the search strings, otherwise they could be replaced twice.