Iphone : Problem regarding replacing String?

I Want Replace String ':' by '/',

I am Using this code to replace

NSString *newPath = [imgPath stringByReplacingOccurrencesOfString:@":" withString:@"/"];

But at a time, I get this error

-[__NSCFDictionary stringByReplacingOccurrencesOfString:withString:]: unrecognized selector sent to instance 0x664e650

W开发者_JAVA技巧hat Should I do ?

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1. imgPath is NSDictionary should be NSString.
2. If imgpath is NSStRING, probably it is released already

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I feel there might be some structured organized way the data in your NSString. I faced a similar situation . I had my data with recursive {}. You should replace NSString *imgPath to NSDictionary *dictPath . Having done that read your fields with [dictPath objectForKey:@"key"] than read the fields again in NSString and remove special characters.