如何将内容处理表单数据保存到NSString

// 表单数据
NSDictionary *formData = @{@"name": @"John", @"age": @"25", @"email": @"john@example.com"};

// 创建NSMutableString对象
NSMutableString *string = [NSMutableString string];

// 遍历表单数据
[formData enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSString *value, BOOL *stop) {
    // 拼接表单字段名称和值
    NSString *field = [NSString stringWithFormat:@"%@=%@", key, value];
    
    // 对表单字段进行编码
    NSString *encodedField = [field stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
    
    // 添加到NSMutableString对象
    [string appendString:encodedField];
    
    // 添加分隔符
    [string appendString:@"&"];
}];

// 移除最后一个分隔符
if (string.length > 0) {
    [string deleteCharactersInRange:NSMakeRange(string.length - 1, 1)];
}

// 将NSMutableString对象转换为NSString对象
NSString *result = [string copy];

// 输出结果
NSLog(@"%@", result);