Question

有一种委托方法：

    <div class="section">
        <div class="container">
            <div class="row">
                <div class="col-md-12">
                    <form role="form" method="post" id="main-form" action="">
                        <div class="col-md-12 container-fluid row text-center">
                            <div class="form-group col-md-3">
                                <label class="" for="myList">*Item Name</label>
                                <br>
                                <select class="col-md-12 form-control" id="myList1" name="itemlist1" onChange="setItemUnit();showAmount();">
                                    <option value="None">Select Items<br></option>
                                    <option value="soap">Soap</option>
                                    <option value="detergent">Detergent</option>
                                    <option value="handwash">Hand Wash</option>
                                    <option value="wire">Wire</option>
                                </select>
                            </div>
                            <div class="form-group col-md-2 text-center">
                                <label class="" for="unit1">UOM</label>
                                <p class="form-control text-right" id="unit1">NA</p>
                            </div>
                            <div class="form-group col-md-2 text-center">
                                <label class="control-label" for="rate1">*Rate/Unit</label>
                                <p class="form-control text-right" id="rate1">0</p>
                            </div>
                            <div class="form-group col-md-2 text-center">
                                <label class="control-label" for="qty1">*Ordered Qty</label>
                                <input class="form-control text-right" id="qty1" placeholder="0" type="number" onChange="showAmount();">
                            </div>
                            <div class="form-group col-md-3 text-center">
                                <label class="control-label" for="amt1">*Amount(Rs.)</label>
                                <p class="form-control text-right" id="amt1"></p>
                            </div>
                        </div>
                        <div class="col-md-12 container-fluid row text-justify">
                            <div class="form-group col-md-3">
                                <select class="col-md-12 form-control" id="myList2" name="itemlist2" onChange="setItemUnit2();showAmount();">
                                    <option value="None">Select Items</option>
                                    <option value="soap">Soap</option>
                                    <option value="detergent">Detergent</option>
                                    <option value="handwash">Hand Wash</option>
                                    <option value="wire">Wire</option>
                                </select>
                            </div>
                            <div class="form-group col-md-2 text-center">
                                <p class="form-control text-right" id="unit2">NA</p>
                            </div>
                            <div class="form-group col-md-2 text-center">
                                <p class="form-control text-right" id="rate2">0</p>
                            </div>
                            <div class="form-group col-md-2 text-center">
                                <input class="form-control text-right" id="qty2" placeholder="0" type="number" onChange="showAmount();">
                            </div>
                            <div class="form-group col-md-3 text-center">
                                <p class="form-control text-right" id="amt2"></p>
                            </div>
                        </div>
                        <div class="col-md-12 container-fluid row text-justify">
                            <div class="form-group col-md-3">
                                <select class="col-md-12 form-control" id="myList3" name="itemlist3" onChange="setItemUnit3();showAmount();">
                                    <option value="None">Select Items</option>
                                    <option value="soap">Soap</option>
                                    <option value="detergent">Detergent</option>
                                    <option value="handwash">Hand Wash</option>
                                    <option value="wire">Wire</option>
                                </select>
                            </div>
                            <div class="form-group col-md-2 text-center">
                                <p class="form-control text-right" id="unit3">NA</p>
                            </div>
                            <div class="form-group col-md-2 text-center">
                                <p class="form-control text-right" id="rate3">0</p>
                            </div>
                            <div class="form-group col-md-2 text-center">
                                <input class="form-control text-right" id="qty3" placeholder="0" type="number" onChange="showAmount();">
                            </div>
                            <div class="form-group col-md-3 text-center">
                                <p class="form-control text-right" id="amt3"></p>
                            </div>
                        </div>

                        <div class="col-md-12 container-fluid row text-justify" id="adder">
                            <div class="form-group col-md-12">
                                <button class="btn btn-block btn-primary" onclick="addNewItem();">Add more Items+</button>
                            </div>
                        </div>

                        <div class="col-md-12 container-fluid row text-justify">
                            <div class="form-group col-md-2 col-md-offset-7 text-center">
                                <label class="control-label text-primary" for="">*Total Qty</label>
                                <p class="form-control text-right" name="qty-total" id="qty-total"></p>
                                <!--<a class="btn btn-info btn-block"><p name="qty-total" id="qty-total"></p></a>-->
                            </div>
                            <div class="form-group col-md-2 text-center">
                                <label class="control-label text-primary" for="amt-total">*Total Amount(Rs.)Σ</label>
                                <p class="form-control text-right" name="amt-total" id="amt-total"></p>
                                <!--<a class="btn btn-info btn-block"><p name="amt-total" id="amt-total"></p></a>-->
                            </div>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>

...但它已被弃用，所以我用这个方法替换它：

- (BOOL)application:(UIApplication *)application 
            openURL:(NSURL *)url    
  sourceApplication:(NSString *)sourceApplication 
         annotation:(id)annotation 
{
    return [[FBSDKApplicationDelegate sharedInstance] application:application
                                                          openURL:url
                                                sourceApplication:sourceApplication
                                                       annotation:annotation];
}

如何从NSDictionary中仅使用字符串对象，以及类似于id。

Answer 1

这是Objective C轻量级泛型的语法。此功能主要用于修复Objective C - Swift互操作性问题。

NSDictionary<NSString *,id>意味着，字典键应该是NSString类型，它的值可以是任何类型的对象（id）。

下面是从NSDictionary<NSString *,id>获取值的示例，我希望这可以帮助您根据从Facebook登录获得的响应来提取NSString对象和id。

    //Assign Generic Value.
    float fltT = 98564.5f;
    NSMutableDictionary<NSString *, id> *_generic;
    _generic = [[NSMutableDictionary alloc] init];
    _generic[@"genericValue"] = [NSNumber numberWithFloat:fltT];
    NSLog(@"Assigned Generic Value:%@",_generic);

    //Access generic values from NSMutableDictionary
    NSLog(@"Access Generic Value:%@",_generic[@"genericValue"]);

这是输出日志： -

Answer 2

您可以在方法内部进行日志记录或调试，并查看值。

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation{
  NSLog(@"sourceApplication: %@,annotation: %@",sourceApplication,annotation);
  //return ...
}

日志为：sourceApplication: com.apple.SafariViewService,annotation: (null)

在保留方法中：

-(BOOL) application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary<NSString *,id> *)options{
NSLog(@"%@", options);
//return ...

}

日志是：

UIApplicationOpenURLOptionsOpenInPlaceKey = 0;
    UIApplicationOpenURLOptionsSourceApplicationKey = "com.apple.SafariViewService";

所以你可以像那样替换你的代码

return [[FBSDKApplicationDelegate sharedInstance] application:app
                                                          openURL:url
                                                sourceApplication:[options valueForKey:@"UIApplicationOpenURLOptionsSourceApplicationKey"]
                                                       annotation:nil];

但我认为使用第一种方法是可以的，不需要使用这种方法：D 或者您可以在此链接上阅读有关Apple文档的更多信息：https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIApplicationDelegate_Protocol/index.html?hl=ar

快乐的编码;

NSDictionary只返回一个对象

2 个答案: