How to take the parameter from URL scheme.

Question

I am using URL scheme in my iPhone app,from a page I switch user to safari,and a button click from Web page,I am reverting back to app At that time ,some parameters are passed by the web page like

 myapp://parameter=1

How can I find this parameter from my app ? I have placed a break point in

    -(BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)ur

but while revert back.it is not get called.

Solution 1

You can use this url host to find out the parameters, where parameters could be of any kind, anything after http:// or custom tag custom:// will be caught in the following code

 NSString *urlParameter = [[url host] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

If you have multiple parameters then you could use componentsSeparatedByString method to separate the parameters

Solution 2

NSString *query = [url query];
NSArray *queryComponents = [query componentsSeparatedByString:@"&"];

Now you got all strings in queryComponents like

param1=value

Now you can get first value like that

NSArray *firstParam = [[queryComponents objectAtIndex:0] componentsSeparatedByString:@"="];

[firstParam objectAtIndex:0] is the name of param
[firstParam objectAtIndex:1] is value of the param

Solution 3

Try this code. this ll useful even if you had numbers of parameters and values in url.

NSURL *url = [NSURL URLWithString:@"xyz.com/result.php?data1=1123660801&data2=250072028055&presult=SUCCESS"];

NSURLComponents *components = [NSURLComponents componentsWithURL:url resolvingAgainstBaseURL:NO];
NSArray *queryItems = [components queryItems];

NSMutableDictionary *dict = [NSMutableDictionary new];

for (NSURLQueryItem *item in queryItems)
{
    [dict setObject:[item value] forKey:[item name]];
}

Comments

[nsgulliver]

@Mert I have tried query for my custom links when I created, I never got anything inside query, might be because I had custom parameters after customtag:// so i preferred using [url host]

[nsgulliver]

just use in this -(BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url method, just try to NSLog the value there when you click the custom link, it will print out parameter=1

[Mert]

If you have a URL like that customschema://myhost/?param=1&secondParam=2 it works. It is common, the urls look like this. I use myhost for different actions in my app like showAlert, showsomeview etc... Then I can check what to do

[Mert]

You can use it in your -(BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url method. You have the url here

[2am]

Do you have any idea how this can be achieved in vanilla c++? Is there an equivalent function in Carbon?

[Ahmad Al-Attal]

this should be the answer, just make it more specific to answer the question.