Creating URL query parameters from NSDictionary objects in ObjectiveC

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////  Http.m//  test////  Created by robin on 14-4-4.//  Copyright (c) 2014年 robin. All rights reserved.//#import "Http.h"@implementation Http//  参数URL加密+(NSString*)urlEscape:(NSString *)unencodedString {    NSString *s = (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(NULL,                                                                                        (CFStringRef)unencodedString,                                                                                        NULL,                                                                                        (CFStringRef)@"!*'\"();:@&=+$,/?%#[]% ",                                                                                        kCFStringEncodingUTF8));    return s;}// 把参数放到URL尾部+(NSString*)addQueryStringToUrl:(NSString *)url params:(NSDictionary *)params {    NSMutableString *urlWithQuerystring = [[NSMutableString alloc] initWithString:url];    // 转换参数    if (params) {        for(id key in params) {            NSString *sKey = [key description];            NSString *sVal = [[params objectForKey:key] description];            // 需要添加 add ?k=v or &k=v ?            if ([urlWithQuerystring rangeOfString:@"?"].location == NSNotFound) {                [urlWithQuerystring appendFormat:@"?%@=%@", [Http urlEscape:sKey], [Http urlEscape:sVal]];            } else {                [urlWithQuerystring appendFormat:@"&%@=%@", [Http urlEscape:sKey], [Http urlEscape:sVal]];            }        }    }    return urlWithQuerystring;}@end

For Example:

NSDictionary *params = @{@"params1":@"params", @"params2":@"paramswww"}; NSString *urlWithQuerystring = [self addQueryStringToUrl:@"https://www.baidu.com/login" params:params];

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