在开发中经常遇到通过URL来获取参数，下面总结了几个方法
通过 NSURLComponents 获取
/**
获取url的所有参数
@param url 需要提取参数的url
@return NSDictionary
*/
-(NSDictionary *)paramerWithURL:(NSURL *) url {
NSMutableDictionary *paramer = [[NSMutableDictionary alloc]init];
//创建url组件类
NSURLComponents *urlComponents = [[NSURLComponents alloc] initWithString:url.absoluteString];
//遍历所有参数，添加入字典
[urlComponents.queryItems enumerateObjectsUsingBlock:^(NSURLQueryItem * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
[paramer setObject:obj.value forKey:obj.name];
}];
return paramer;
}
通过 key 来获取 url 中的参数值 未获取到返回空字符串
- (NSString *)getParamByKey:(NSString *)key URLString:(NSString *)url
{
NSError *error;
NSString *regTags = [[NSString alloc] initWithFormat:@"(^|&|\\?)+%@=+([^&]*)(&|$)", key];
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regTags
options:NSRegularExpressionCaseInsensitive
error:&error];
// 执行匹配的过程
NSArray *matches = [regex matchesInString:url
options:0
range:NSMakeRange(0, [url length])];
for (NSTextCheckingResult *match in matches) {
NSString *tagValue = [url substringWithRange:[match rangeAtIndex:2]];
return tagValue;
}
return @"";
}
也可以通过简单易懂的方法
- (NSMutableDictionary *)parseURLParameters:(NSString *)url{
NSRange range = [url rangeOfString:@"?"];
if (range.location == NSNotFound) return nil;
NSMutableDictionary *parameters = [NSMutableDictionary dictionary];
NSString *parametersString = [url substringFromIndex:range.location + 1];
if ([parametersString containsString:@"&"]) {
NSArray *urlComponents = [parametersString componentsSeparatedByString:@"&"];
for (NSString *keyValuePair in urlComponents) {
NSArray *pairComponents = [keyValuePair componentsSeparatedByString:@"="];
NSString *key = [pairComponents.firstObject stringByRemovingPercentEncoding];
NSString *value = [pairComponents.lastObject stringByRemovingPercentEncoding];
if (key == nil || value == nil) {
continue;
}
id existValue = [parameters valueForKey:key];
if (existValue != nil) {
if ([existValue isKindOfClass:[NSArray class]]) {
NSMutableArray *items = [NSMutableArray arrayWithArray:existValue];
[items addObject:value];
[parameters setValue:items forKey:key];
} else {
[parameters setValue:@[existValue, value] forKey:key];
}
} else {
[parameters setValue:value forKey:key];
}
}
} else {
NSArray *pairComponents = [parametersString componentsSeparatedByString:@"="];
if (pairComponents.count == 1) {
return nil;
}
NSString *key = [pairComponents.firstObject stringByRemovingPercentEncoding];
NSString *value = [pairComponents.lastObject stringByRemovingPercentEncoding];
if (key == nil || value == nil) {
return nil;
}
[parameters setValue:value forKey:key];
}
return parameters;
}
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