IOS截取URL中的参数

• 项目开发中需要截取URL中的参数

http://example.com?param1=value1&param2=param2

• 直接使用字符串分割

// Swift代码，IOS8以上extension String {    /// 从String中截取出参数    var urlParameters: [String: AnyObject]? {        // 判断是否有参数        guard let start = self.rangeOfString("?") else {            return nil        }        var params = [String: AnyObject]()        // 截取参数        let index = start.startIndex.advancedBy(1)        let paramsString = substringFromIndex(index)        // 判断参数是单个参数还是多个参数        if paramsString.containsString("&") {            // 多个参数，分割参数            let urlComponents = paramsString.componentsSeparatedByString("&")            // 遍历参数            for keyValuePair in urlComponents {                // 生成Key/Value                let pairComponents = keyValuePair.componentsSeparatedByString("=")                let key = pairComponents.first?.stringByRemovingPercentEncoding                let value = pairComponents.last?.stringByRemovingPercentEncoding                // 判断参数是否是数组                if let key = key, value = value {                    // 已存在的值，生成数组                    if let existValue = params[key] {                        if var existValue = existValue as? [AnyObject] {                            existValue.append(value)                        } else {                            params[key] = [existValue, value]                        }                    } else {                        params[key] = value                    }                }            }        } else {            // 单个参数            let pairComponents = paramsString.componentsSeparatedByString("=")            // 判断是否有值            if pairComponents.count == 1 {                return nil            }            let key = pairComponents.first?.stringByRemovingPercentEncoding            let value = pairComponents.last?.stringByRemovingPercentEncoding            if let key = key, value = value {                params[key] = value            }        }        return params    }}

// Objective-C IOS8以上@implementation NSString (Utils)/** *  截取URL中的参数 * *  @return NSMutableDictionary parameters */- (NSMutableDictionary *)getURLParameters {    // 查找参数    NSRange range = [self rangeOfString:@"?"];    if (range.location == NSNotFound) {        return nil;    }    NSMutableDictionary *params = [NSMutableDictionary dictionary];    // 截取参数    NSString *parametersString = [self substringFromIndex:range.location + 1];    // 判断参数是单个参数还是多个参数    if ([parametersString containsString:@"&"]) {        // 多个参数，分割参数        NSArray *urlComponents = [parametersString componentsSeparatedByString:@"&"];        for (NSString *keyValuePair in urlComponents) {            // 生成Key/Value            NSArray *pairComponents = [keyValuePair componentsSeparatedByString:@"="];            NSString *key = [pairComponents.firstObject stringByRemovingPercentEncoding];            NSString *value = [pairComponents.lastObject stringByRemovingPercentEncoding];            // Key不能为nil            if (key == nil || value == nil) {                continue;            }            id existValue = [params valueForKey:key];            if (existValue != nil) {                // 已存在的值，生成数组                if ([existValue isKindOfClass:[NSArray class]]) {                    // 已存在的值生成数组                    NSMutableArray *items = [NSMutableArray arrayWithArray:existValue];                    [items addObject:value];                    [params setValue:items forKey:key];                } else {                    // 非数组                    [params setValue:@[existValue, value] forKey:key];                }            } else {                // 设置值                [params setValue:value forKey:key];            }        }    } else {        // 单个参数        // 生成Key/Value        NSArray *pairComponents = [parametersString componentsSeparatedByString:@"="];        // 只有一个参数，没有值        if (pairComponents.count == 1) {            return nil;        }        // 分隔值        NSString *key = [pairComponents.firstObject stringByRemovingPercentEncoding];        NSString *value = [pairComponents.lastObject stringByRemovingPercentEncoding];        // Key不能为nil        if (key == nil || value == nil) {            return nil;        }        // 设置值        [params setValue:value forKey:key];    }    return params;}@end

• 使用案例：

// Swiftlet url = "http://example.com?param1=value1&param2=value2"let url1 = "http://example.com?param1=value1&param1=value2"let params = url.urlParameterslet params1 = url1.urlParameters// 字典print(params)// 数组print(params1)

Optional([“param1”: value1, “param2”: value2])
Optional([“param1”: ( value1, value2 ) ])

Objective-CNSString *url = @"http://example.com?param1=value1&param2=value2";NSString *url1 = @"http://example.com?param1=value1&param1=value2";NSDictionary *dic = [url getURLParameters];NSDictionary *dic1 = [url1 getURLParameters];NSLog(@"dic ---- \n%@", dic);NSLog(@"dic1 ---- \n%@", dic1);

2016-08-18 14:14:05.943 test[8591:784432] dic ---- {    param1 = value1;    param2 = value2;}2016-08-18 14:15:05.210 test[8625:788127] dic1 ---- {    param1 =     (        value1,        value2    );}

• 另一种方法则是使用系统的类 NSURLComponents

// Swiftlet url = "http://example.com?param1=value1&param2=value2"let urlComponents = NSURLComponents(string: url)let queryItems = urlComponents?.queryItemsfor item in queryItems! {    print(item.name)    print(item.value)}

以下方法和上面的截取方法一样，会更简洁：

// Swift代码，IOS8以上extension String {    /// 从String中截取出参数    var urlParameters: [String: AnyObject]? {            // 截取是否有参数            guard let urlComponents = NSURLComponents(string: self), queryItems = urlComponents.queryItems else {                return nil            }            // 参数字典            var parameters = [String: AnyObject]()            // 遍历参数            queryItems.forEach({ (item) in                // 判断参数是否是数组                if let existValue = parameters[item.name], value = item.value {                    // 已存在的值，生成数组                    if var existValue = existValue as? [AnyObject] {                        existValue.append(value)                    } else {                        parameters[item.name] = [existValue, value]                    }                } else {                    parameters[item.name] = item.value                }            })            return parameters        }}

待续