ios - How to declare URLDecode? - iphone

Question

I'm trying to get access token,when I decode URL it's getting an error,I think am declaring wrong here.How to declare URLDecode to get access token?
in .h file
#interface NSString (URLDecode)
-(NSString *)URLDecode;
#end
in .m file
-(NSString *)URLDecode
{
NSString *result = [(NSString*)self stringByReplacingOccurrencesOfString:#"+" withString:#" "];
result = [result stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
return result;
}
- (NSDictionary*)parsePairs:(NSString*)urlStr
{
NSRange r = [urlStr rangeOfString:#"="];
if(r.length == 0)
{
return nil;
}
//Here I'm getting an error
NSString* token = [[urlStr substringFromIndex:r.location + 1 ] URLDecode];
NSCharacterSet* objectMarkers;
objectMarkers = [NSCharacterSet characterSetWithCharactersInString:#"{}"];
token = [token stringByTrimmingCharactersInSet:objectMarkers];
NSError* regexError;
NSMutableDictionary* pairs = [NSMutableDictionary dictionaryWithCapacity:10];
NSRegularExpression* regex;
regex = [NSRegularExpression regularExpressionWithPattern:#"\"([^\"]*)\":\"([^\"]*)\""
options:0
error:&regexError];
NSArray* matches = [regex matchesInString:token
options:0
range:NSMakeRange(0, token.length)];
for(NSTextCheckingResult* result in matches)
{
for(int n = 1; n < [result numberOfRanges]; n += 2)
{
NSRange r = [result rangeAtIndex:n];
if(r.length > 0)
{
NSString* name = [token substringWithRange:r];
r = [result rangeAtIndex:n + 1];
if(r.length > 0)
{
NSString* value = [token substringWithRange:r];
[pairs setObject:value forKey:name];
}
}
}
}
regex = [NSRegularExpression regularExpressionWithPattern:#"\"([^\"]*)\":([0-9]*)"
options:0
error:&regexError];
matches = [regex matchesInString:token
options:0
range:NSMakeRange(0, token.length)];
for(NSTextCheckingResult* result in matches)
{
for(int n = 1; n < [result numberOfRanges]; n += 2)
{
NSRange r = [result rangeAtIndex:n];
if(r.length > 0)
{
NSString* name = [token substringWithRange:r];
r = [result rangeAtIndex:n + 1];
if(r.length > 0)
{
NSString* value = [token substringWithRange:r];
NSNumber* number = [NSNumber numberWithInt:[value intValue]];
[pairs setObject:number forKey:name];
}
}
}
}
return pairs;
}
Any ideas?

Answer 1

You need to make a cetgory of NSString in your Xcode project as :
1.
Then do as :
Then when you click Next button a cetgory will be created of NSString . Then use add code in that. And then Import this category in your class as :
#import "NSString+URLDecode.h"
and then call method declared in category over NSString as
NSString *decodedUrlStr = [urlStr URLDecode];
Hope it helps you.