I was looking for a simple way to build URL’s with long parameter lists.
There were two problems that I ran into:
- The CFURLCreateStringByAddingPercentEscapes method apparently isn’t completely fool proof.
- [NSString stringWithFormat] gets messy with a lot of parameters.
So I created a class to trivialize the handling of this circumstance.
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#import <Foundation/Foundation.h> @interface UrlParameterBuilder : NSObject { NSMutableDictionary* parameters; } -(UrlParameterBuilder*)init; -(UrlParameterBuilder*)initWithParameterDictionary:(NSDictionary*)parameterDictionary; -(void)addParamWithTitle:(NSString*)title andValue:(NSString*)value; -(NSString*)getUrlString; @end |
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#import "URLParameterBuilder.h" @implementation UrlParameterBuilder -(UrlParameterBuilder*)init { self = [super init]; parameters = [NSMutableDictionary dictionary]; return self; } -(UrlParameterBuilder*)initWithParameterDictionary:(NSDictionary*)parameterDictionary { self = [super init]; parameters = [NSMutableDictionary dictionaryWithDictionary:parameterDictionary]; return self; } -(void)addParamWithTitle:(NSString*)title andValue:(NSString*)value { [parameters setObject:value forKey:title]; } -(NSString*)getUrlString { NSMutableString* result = [NSMutableString string]; BOOL firstIterationComplete = NO; for (NSString* key in parameters) { [result appendFormat:@"%c%@=%@", firstIterationComplete ? '&' : '?', key, [self urlEncodeString:[parameters objectForKey:key]] ]; firstIterationComplete = YES; } return [NSString stringWithString:result]; } -(NSString*)urlEncodeString:(NSString*)unencodedString { NSString* encodedString = (__bridge NSString*)CFURLCreateStringByAddingPercentEscapes( NULL, (__bridge CFStringRef)unencodedString, NULL, CFSTR("!*'();:@&=+$,/?%#[]\" "), kCFStringEncodingUTF8); return encodedString; } @end |
The usage is quite simple:
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UrlParameterBuilder* builder = [[UrlParameterBuilder alloc] initWithParameterDictionary:@{ @"First param":@")+]*&[}{)+]*htnaoeunsht Jibberish", @"user":@"Username", @"query":@"Some query.", }]; if (we_want_sorting) { [builder addParamWithTitle:@"sort" andValue:@"desc"]; } NSog(@"Nicely encoded params: %@", [builder getUrlString]); |