CODEWITHSUNDEEP
iphoneobjective-ciosxcodensmutablearray
pixelbitlabs
pixelbitlabs

Reputation: 1934

How to check if an NSMutableArray contains an object which contains certain text?

How can I check if an NSMutableArray contains an object which contains certain text? Then, if there is one piece of text which has been found, it will replace it with another bit of text.

Thanks

Upvotes: 2

Views: 2491

Answers (3)

vdaubry
vdaubry

Reputation: 11439

You can either iterate on your array, do the checking on each object and then replace if necessary.

Or you could use something fancier with :

- (void)makeObjectsPerformSelector:(SEL)aSelector withObject:(id)anObject

I havent tried it but you could create a method in your object that takes a dictionary, or an array with first element being the text to compare and second element the text to replace :

- (void) replaceTextWithParameters:(NSArray*)parameters {
    if([self.yourText isEqualToString:[parameters objectAtIndex:0]) {
        self.yourText = [parameters objectAtIndex:1];
    }
}

Then you would only have to call :

NSArray *parameterArray = [NSArray arrayWithObjects:@"Text to search", @"replacementText", nil];
[yourArray makeObjectsPerformSelector:@selector(replaceTextWithParameters:) withObject:parameterArray];

It would be a lot faster at run time than looping on each element of your array (especially if you have many elements)

Upvotes: -1

Sree
Sree

Reputation: 907

You can perform a check inside a for loop for all objects in the NSMutableArray , use [object rangeOfString:@"text"] for check the range.

Upvotes: 1

Jacob Relkin
Jacob Relkin

Reputation: 163238

Something like this should work:

@interface NSMutableArray (JRAdditions) 

- (void) replaceStringObjectsContainingString:(NSString *) str withString:(NSString *) newString;

@end

@implementation NSMutableArray (JRAdditions)

- (void) replaceStringObjectsContainingString:(NSString *) str withString:(NSString *) newString {

   for(unsigned i = 0; i < [self count]; ++i) {
      id obj = [self objectAtIndex:i];

      if(![obj isKindOfClass:[NSString class]]) continue;

      NSString *replaced = [str stringByReplacingOccurrencesOfString:str withString:newString];
      [self replaceObjectAtIndex:i withObject:replaced];

   }
}

@end

You'd then use it as such:

NSMutableArray *array = ...;

[array replaceStringObjectsContainingString:@"blah" withString:@"foo"];

Upvotes: 2

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