ios replace substring by new substring

Question

I have a string like below -

<html> 
<head> 
</head> 
<body>

<p>***Some Text***.</p>

<p><iframe allowfullscreen="" frameborder="0" height="360" src="//www.some-domain.com/embed/mwOFWJUOpv8" width="600"></iframe></p></body>

I want to replace some of parameters in the iframe tag at the bottom of string as -

<iframe allowfullscreen="" frameborder="0" height="new vlaue" src="//www.some-domain.com/embed/mwOFWJUOpv8" width="new value"></iframe>

I can successfully grab out string starting from "<iframe" to "</iframe>" with the required changes. I am getting problem to replace that whole <iframe ...</iframe> with new string.

So my result should be like this -

<html> 
    <head> 
    </head> 
    <body>

    <p>***Some Text***.</p>

    <p><iframe allowfullscreen="" frameborder="0" height="new vlaue" src="//www.some-domain.com/embed/mwOFWJUOpv8" width="new value"></iframe></p></body>

EDIT : - I have followed this approach, but could not replace whole iframe tag in string.

Please help me out!

check this answer, similar but same approach can be used stackoverflow.com/questions/16207919/… — Jay
– Jay, Commented Jan 19, 2015 at 6:54

gabbler · Accepted Answer · 2015-01-19 07:23:32Z

1

Give it a try like this. Suppose str is the grabbed out string mentioned in your post.

str = [str stringByReplacingOccurrencesOfString:@"width=\"600\"" withString:@"width=\"new value\""];

Edit

NSString *theStr= @"<iframe allowfullscreen=\"\" frameborder=\"0\" height=\"360\" src=\"//www.some-domain.com/embed/mwOFWJUOpv8\" width=\"600\"></iframe>";
NSString *replacedStr = [theStr stringByReplacingOccurrencesOfString:@"width=\"600\"" withString:@"width=\"new value\""];

NSRange range1 = [sourceStr rangeOfString:@"<iframe"];
NSRange range2 = [sourceStr rangeOfString:@"iframe>"];

NSRange range3 = NSMakeRange(range1.location, range2.location + range2.length - range1.location);

NSString *finalStr = [sourceStr stringByReplacingCharactersInRange:range3 withString:replacedStr];

edited Jan 19, 2015 at 7:23

answered Jan 19, 2015 at 6:57

gabbler

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1 Comment

Nayan Over a year ago

I can grab out substring, and make changes as I want successfully, problem I am getting is to replace that grabbed substring in original string!

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