ios - 使用 Swift 3 调用 Objective-C 方法

Question

我要疯了。

根据 StackOverflow 和其他网站上的一些答案，我正在尝试在 Swift 中调用 Objective-c 方法。但是我在初始化方法时遇到了一些错误...

#error : Cannot convert value of type '()' to specified type 'getEvents'

是因为 Swift 3 吗？我在这里做错了什么？

这是我的完整代码:

getEvents.h

#import <Foundation/Foundation.h>

@interface getEvents : NSString

+(NSString *) objGetEvents:(NSString *)latitude andLon:(NSString *)longitude andRadius:(NSString *)radius andMeasure:(NSString *)measure;

@end

getEvents.m

#import "getEvents.h"

@implementation getEvents

+(NSString *) objGetEvents:(NSString *)latitude andLon:(NSString *)longitude andRadius:(NSString *)radius andMeasure:(NSString *)measure {

    NSString *link = [[NSString alloc] initWithFormat: @"http://some.website/file.php?lat=%@&lon=%@&ms=%@&dist=%@", latitude, longitude, measure, radius];

    NSData *myData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[link stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLFragmentAllowedCharacterSet]]]];

    return [[NSString alloc] initWithData:myData encoding:NSUTF8StringEncoding];

}

@end

ListEvents.swift

func getEvents() {
    let getEventsObj:getEvents = getEvents()
    // error: Cannot convert value of type '()' to specified type 'getEvents'

    let jsonString = getEventsObj.objGetEvents(latitude, andLon: longitude, andRadius: searchRadius, andMeasure: searchMeasure) as NSString 
    // error: Static member 'objGetEvents' cannot be used on instance of type 'getEvents'

    print(jsonString)
}

附言。我在 Extension-Bridging-Header.h 中导入“getEvents.h”

---

我正在尝试使用 Objective-C NSData 因为 NSData on Swift 并获取我在这个问题中指定的 URL 的内容: https://stackoverflow.com/questions/40194517/nsdatacontentsof-options-works-on-the-simulator-but-not-on-the-device

Answer 1

您已经声明了一个类函数，不需要创建一个实例。

你的代码应该是这样的:

 func getEvents() {
        let jsonString = getEvents.objGetEvents(latitude, andLon: longitude, andRadius: searchRadius, andMeasure: searchMeasure) as NSString 

        print(jsonString)
    }