Ios 数据从UNIUrlConnection中消失

我试图做的是将数据从Objective-C传递到swift文件

@IBAction func search(_ sender: Any) {

    let ingreArr = IngredientsText.text.components(separatedBy: [",", " "])
    var ingre:String = ingreArr[0]
    let sep:String = "%2C"
    for (index,element) in ingreArr.enumerated() {
        if (index >= 1) {
            ingre = ingre + sep + element
        }
    }
    let test = findByIngredients()
    // test.connectAPI(ingre, number: NumberOfResults.text)
    let result: Dictionary = test.connectAPI(ingre, number: NumberOfResults.text) as Dictionary

    let num:Int = result.count

    print(num)
}

最近，当我成功地将objective c文件与swift文件连接后，我可以打印从UNIUrlConnection获取的数据（这意味着swift和objective-c之间的连接工作正常）

然后创建一个NSMutableDictionary对象，并将这些数据添加到NSMutableDictionary中。我想将这个NSMutableDictionary对象传递到我的swift文件，以便在我的viewController上输出它们

但是，NSMutableDictionary在UNIUrlConnection内包含正确的数据，但在UNIUrlConnection外则不包含任何数据。因此，传递给swift文件的NSMutableDictionary始终不包含任何数据。我怎样才能解决这个问题

这是我的目标c文件

#import <Foundation/Foundation.h>
#import <UNIRest.h>
#import "findByIngredients.h"

@implementation findByIngredients

-(NSMutableDictionary*) connectAPI:(NSString*) ingredients Number:(NSString*) number{

NSMutableDictionary *temp = [NSMutableDictionary dictionaryWithCapacity:10];

NSString* url = @"https://spoonacular-recipe-food-nutrition-v1.p.mashape.com/recipes/findByIngredients?fillIngredients=false";
if (![ingredients  isEqual: @""]) {
    NSString* ingre = @"&ingredients=";
    ingre = [ingre stringByAppendingString:ingredients];
    url = [url stringByAppendingString:ingre];
}
else {
    NSString* ingre = @"&ingredients=<required>";
    url = [url stringByAppendingString:ingre];
}
NSString* LL = @"&limitLicense=false";
url = [url stringByAppendingString:LL];
if (![number  isEqual: @""]) {
    NSString* numberOfReturn = @"&number=";
    numberOfReturn = [numberOfReturn stringByAppendingString:number];
    url = [url stringByAppendingString:numberOfReturn];
}
NSString* ranking = @"&ranking=1";
url = [url stringByAppendingString:ranking];

// These code snippets use an open-source library. http://unirest.io/objective-c
NSDictionary *headers = @{@"X-Mashape-Key": @"KEY", @"Accept": @"application/json"};
UNIUrlConnection *asyncConnection = [[UNIRest get:^(UNISimpleRequest *request) {
    [request setUrl:url];
    [request setHeaders:headers];
}] asJsonAsync:^(UNIHTTPJsonResponse *response, NSError *error) {
    NSInteger code = response.code;
    NSDictionary *responseHeaders = response.headers;
    UNIJsonNode *body = response.body;
    NSData *rawBody = response.rawBody;

    if (rawBody) {
        id allKeys = [NSJSONSerialization JSONObjectWithData:rawBody options:0 error:&error];

        for (int i=0; i<[allKeys count]; i++) {
            NSDictionary *arrayResult = [allKeys objectAtIndex:i];
            // NSString* myNewString = [NSString stringWithFormat:@"%d", i];
            NSString *key = [arrayResult objectForKey:@"id"];
            NSString *value = [arrayResult objectForKey:@"title"];
            [temp setObject:value forKey:key];
            NSLog(@"id=%@",[arrayResult objectForKey:@"id"]);
            NSLog(@"title=%@",[arrayResult objectForKey:@"title"]);
        }
    }

    int size = [temp count];
    NSLog(@"temp size is %d",size);

    NSLog(@"successfully test API");
}];

// int size = [temp count];
// NSLog(@"temp size is %d",size);

return temp;
}

@end

---

num是0。

asyncConnection

&

asJsonAsync:

这给mis留下了很多异步的印象。我猜呢<代码>打印（num）在

NSLog之前调用（@“dic3大小为%d”，大小）。使用闭包/块。没错，在NSLog之前调用print（num）。我试图做的是将NSMutableDictionary从Objective-C传递到swift文件。但是，它不起作用。有什么想法吗？你必须创建一个块（在Objective-C中）并在Swift中使用它（称为闭包）。关于这一点有很多疑问，但只有一种语言，但逻辑是一样的。对不起。。。在搜索块和闭包之后，我仍然不知道如何更改我的代码。。。我对目标c和斯威夫特很陌生。你能提供更多的信息，比如一个例子，让我可以试试吗？非常感谢…
-（void）connectAPI:（NSString*）成分编号：（NSString*）带块编号：（void（^）（NSMutableDictionary*）块整数大小=[temp count]；如果（block）{block（temp）；}
对于Swift部分，我不使用Swift，所以我不知道。