How to escape an NSString to use in NSURL? [closed]

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Closed 7 years ago.

Got this code so far for my send button:

NSString* urlString = [NSString stringWithFormat:@"http://server.com/ios/add.php?user=iPhone+App&message=%@", messageBox.text stringByAddingPercentEscapesUsingEncoding : NSUFT8StringEncoding];
NSURL *add = [NSURL URLWithString:urlString];

However I do get the error "Expected ':'

回答1:

You need to separate the two string construction calls

NSString* urlString = [[NSString stringWithFormat:@"http://server.com/ios/add.php?user=iPhone+App&message=%@", messageBox.text] stringByAddingPercentEscapesUsingEncoding : NSUTF8StringEncoding];
NSURL *add = [NSURL URLWithString:urlString];

回答2:

The proper way is not to escape the entire URL. You should only escape individual parameter values.

NSString* urlString = [NSString stringWithFormat:@"http://server.com/ios/add.php?user=iPhone+App&message=%@", [messageBox.text stringByAddingPercentEscapesUsingEncoding : NSUFT8StringEncoding]];

Better yet, for readability and easier debugging, do this:

NSString *escapedText = [messageBox.text stringByAddingPercentEscapesUsingEncoding:NSUFT8StringEncoding];
NSString* urlString = [NSString stringWithFormat:@"http://server.com/ios/add.php?user=iPhone+App&message=%@", escapedText];

回答3:

Try:

NSString* urlString = [[NSString stringWithFormat:@"http://server.com/ios/add.php?user=iPhone+App&message=%@", messageBox.text] stringByAddingPercentEscapesUsingEncoding : NSUFT8StringEncoding];

回答4:

Separate the NSString method to see it clearly:

NSString* urlString = [[NSString stringWithFormat:@"http://server.com/ios/add.php?user=iPhone+App&message=%@", messageBox.text] stringByAddingPercentEscapesUsingEncoding : NSUFT8StringEncoding];

回答5:

NSURL will automatically url encode the string when you call NSURL urlWithString this code is not needed.

来源：https://stackoverflow.com/questions/13014398/how-to-escape-an-nsstring-to-use-in-nsurl