iOS 获取当前网速 (kb) 和网络状况 (好、中、差) - OC 代码示例

你可以使用 iOS 的 Reachability 库来获取当前网络状况，然后通过发送网络请求来测量当前的网速。以下是一个获取当前网速和网络状况的示例代码：

首先，下载并导入 Reachability 库，你可以从这里获取：https://github.com/tonymillion/Reachability

然后，创建一个名为 NetworkManager 的单例类，用于管理网络相关操作。在 NetworkManager.h 文件中，添加以下代码：

#import <Foundation/Foundation.h>

typdef NS_ENUM(NSUInteger, NetworkQuality) {
    NetworkQualityGood,
    NetworkQualityModerate,
    NetworkQualityPoor
};

@interface NetworkManager : NSObject

@property (nonatomic, assign, readonly) NetworkQuality networkQuality;
@property (nonatomic, assign, readonly) float currentDownloadSpeed;

+ (instancetype)sharedManager;

@end

在 NetworkManager.m 文件中，添加以下代码：

#import "NetworkManager.h"
#import "Reachability.h"

@interface NetworkManager ()

@property (nonatomic, strong) Reachability *reachability;
@property (nonatomic, assign) BOOL isMonitoring;

@end

@implementation NetworkManager

+ (instancetype)sharedManager {
    static NetworkManager *sharedInstance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{ 
        sharedInstance = [[self alloc] init];
    });
    return sharedInstance;
}

- (instancetype)init {
    self = [super init];
    if (self) {
        self.reachability = [Reachability reachabilityForInternetConnection];
        self.networkQuality = NetworkQualityGood;
        self.currentDownloadSpeed = 0.0;
    }
    return self;
}

- (void)startMonitoring {
    if (self.isMonitoring) {
        return;
    }
    
    self.isMonitoring = YES;
    [self.reachability startNotifier];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkStatusChanged:) name:kReachabilityChangedNotification object:nil];
}

- (void)stopMonitoring {
    if (!self.isMonitoring) {
        return;
    }
    
    self.isMonitoring = NO;
    [self.reachability stopNotifier];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:kReachabilityChangedNotification object:nil];
}

- (void)networkStatusChanged:(NSNotification *)notification {
    Reachability *reachability = notification.object;
    NetworkStatus status = reachability.currentReachabilityStatus;
    
    switch (status) {
        case NotReachable:
            self.networkQuality = NetworkQualityPoor;
            break;
            
        case ReachableViaWiFi:
            self.networkQuality = NetworkQualityGood;
            break;
            
        case ReachableViaWWAN:
            self.networkQuality = NetworkQualityModerate;
            break;
            
        default:
            break;
    }
}

- (void)testDownloadSpeedWithCompletion:(void (^)(float downloadSpeed))completion {
    NSURL *url = [NSURL URLWithString:'https://www.apple.com'];
    NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
    config.timeoutIntervalForRequest = 1.0;
    config.timeoutIntervalForResource = 1.0;
    NSURLSession *session = [NSURLSession sessionWithConfiguration:config];
    NSDate *startTime = [NSDate date];
    
    NSURLSessionDataTask *task = [session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        NSTimeInterval elapsedTime = fabs([startTime timeIntervalSinceNow]);
        float downloadSpeed = (float)data.length / elapsedTime / 1024.0;
        
        if (completion) {
            dispatch_async(dispatch_get_main_queue(), ^{ 
                completion(downloadSpeed);
            });
        }
    }];
    
    [task resume];
}

@end

现在，你可以在你的 ViewController 中使用 NetworkManager 获取当前的网速和网络状况。例如，你可以在视图加载时开始监听网络状态，并在需要时获取当前的网速。以下是一个示例代码：

#import "ViewController.h"
#import "NetworkManager.h"

@interface ViewController ()

@property (nonatomic, strong) NetworkManager *networkManager;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.networkManager = [NetworkManager sharedManager];
    [self.networkManager startMonitoring];
    
    // 获取当前网速
    [self.networkManager testDownloadSpeedWithCompletion:^(float downloadSpeed) {
        NSLog('Current download speed: %.2f kb/s', downloadSpeed);
    }];
}

@end

这样，你就可以通过 NetworkManager 获取当前的网速和网络状况了。在上面的示例中，我们使用了一个简单的网页请求来测量网速，你可以根据自己的需求进行修改。