CODEWITHSUNDEEP
ios
jimrice
jimrice

Reputation: 452

Replace multiple placeholders in string

What I am looking to do is use placeholders in a string and replace the placeholders with data specific to the user. I can setup the placeholders to be anything so basically I am looking to do the following:

  1. Setup placeholders in a string (up to 4 placeholders)
  2. Replace those placeholders with strings I specify

Here is what I have. I currently have a url that has a set of placeholders like so. http://example.com/resource?placeholder1=placeholder2 or http://placeholder1:[email protected]/something?placeholder3

How do I properly label the placeholders and replace them?

Thank you in advance for any help.

Upvotes: 1

Views: 1148

Answers (3)

Abdul91
Abdul91

Reputation: 726

This might help you.

#define placeHolder1 @"<>p1p1p1<>"
#define placeHolder2 @"<>p2p2p2<>"

And place this in a function of yours where you want to replace strings

    NSString * string = [NSString stringWithFormat:@"http://example.com/resource?%@=%@",placeHolder1,placeHolder2];

    NSLog(@"string  %@",string);

    NSString * replacerForP1 = @"123";
    NSString * replacerForP2 = @"741";

    string = [string stringByReplacingOccurrencesOfString:placeHolder1
                                      withString:replacerForP1];

    string = [string stringByReplacingOccurrencesOfString:placeHolder2
                                      withString:replacerForP2];

    NSLog(@"string  %@",string);

It would be best to keep your placeholder strings in the constants defined somewhere. And ofcourse the replacement of those placeholders will be dynamic as you said so cannot make them constants.

Tell me if this helps or if you require further assistance in the matter.

Upvotes: 0

Bista
Bista

Reputation: 7903

Quote : "I want to replace placeholder1 with an NSString I have already created called value1 and placeholder2 with an NSString called key1."

NSString *mainUrl = "http://example.com/resource";
NSString *string1 = "value1";
NSString *string2 = "value2";

Now change your URL:

NSString *newURL = [NSString NSStringWithFormat:@"%@?%@=%@",mainUrl,string1,string2];

This will generate newURL : http://example.com/resource?value1=value2

Upvotes: 0

ondermerol
ondermerol

Reputation: 546

You can use the stringByReplacingOccurrencesOfString method as below


NSString *strUrl = @"http://example.com/resource?placeholder1=placeholder2";
strUrl = [strUrl stringByReplacingOccurrencesOfString:@"placeholder1" withString:@"value1"];
strUrl = [strUrl stringByReplacingOccurrencesOfString:@"placeholder2" withString:@"key1"];

Upvotes: 3

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