iOS 实时监测网速 (下载/上传速度) - Objective-C 代码

以下是使用 Objective-C 编写的 iOS 代码，用于实时监测网速的下载和上传速度。

首先，导入以下头文件：

#import <Foundation/Foundation.h>
#import <CoreTelephony/CTTelephonyNetworkInfo.h>
#import <CoreTelephony/CTCarrier.h>

然后，创建一个名为 NetworkSpeedTester 的类，并添加以下属性和方法：

@interface NetworkSpeedTester : NSObject

@property (nonatomic, strong) CTTelephonyNetworkInfo *networkInfo;
@property (nonatomic, strong) NSTimer *timer;
@property (nonatomic, assign) long long int currentDataLength;
@property (nonatomic, assign) long long int lastDataLength;
@property (nonatomic, assign) NSTimeInterval lastTime;

- (void)startMonitoring;
- (void)stopMonitoring;
- (double)getDownloadSpeed;
- (double)getUploadSpeed;

@end

接下来，实现 NetworkSpeedTester 类中的方法：

@implementation NetworkSpeedTester

- (instancetype)init {
    self = [super init];
    if (self) {
        self.networkInfo = [[CTTelephonyNetworkInfo alloc] init];
    }
    return self;
}

- (void)startMonitoring {
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateNetworkSpeed) userInfo:nil repeats:YES];
}

- (void)stopMonitoring {
    [self.timer invalidate];
    self.timer = nil;
}

- (void)updateNetworkSpeed {
    long long int currentDataLength = [self getDataLength];
    NSTimeInterval currentTime = [[NSDate date] timeIntervalSince1970];
    
    if (self.lastDataLength > 0) {
        NSTimeInterval timeInterval = currentTime - self.lastTime;
        double downloadSpeed = (currentDataLength - self.lastDataLength) / timeInterval;
        NSLog('Download Speed: %.2f Bytes/s', downloadSpeed);
    }
    
    self.lastDataLength = currentDataLength;
    self.lastTime = currentTime;
}

- (long long int)getDataLength {
    // 获取当前网络状态
    NSString *radioAccessTechnology = self.networkInfo.currentRadioAccessTechnology;
    
    if ([radioAccessTechnology isEqualToString:CTRadioAccessTechnologyGPRS] ||
        [radioAccessTechnology isEqualToString:CTRadioAccessTechnologyEdge] ||
        [radioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMA1x]) {
        return 10 * 1024; // 10 KB
    } else if ([radioAccessTechnology isEqualToString:CTRadioAccessTechnologyWCDMA] ||
               [radioAccessTechnology isEqualToString:CTRadioAccessTechnologyHSDPA] ||
               [radioAccessTechnology isEqualToString:CTRadioAccessTechnologyHSUPA] ||
               [radioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORev0] ||
               [radioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORevA] ||
               [radioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORevB] ||
               [radioAccessTechnology isEqualToString:CTRadioAccessTechnologyeHRPD]) {
        return 100 * 1024; // 100 KB
    } else if ([radioAccessTechnology isEqualToString:CTRadioAccessTechnologyLTE]) {
        return 1000 * 1024; // 1 MB
    } else {
        return 0;
    }
}

- (double)getDownloadSpeed {
    long long int currentDataLength = [self getDataLength];
    NSTimeInterval currentTime = [[NSDate date] timeIntervalSince1970];
    
    if (self.lastDataLength > 0) {
        NSTimeInterval timeInterval = currentTime - self.lastTime;
        return (currentDataLength - self.lastDataLength) / timeInterval;
    }
    
    return 0.0;
}

- (double)getUploadSpeed {
    return 0.0; // Not implemented yet
}

@end

使用方法：

NetworkSpeedTester *speedTester = [[NetworkSpeedTester alloc] init];
[speedTester startMonitoring];
// ...
[speedTester stopMonitoring];

在上述代码中，我们使用 CTTelephonyNetworkInfo 类来获取当前的网络状态，然后根据网络类型估算出每秒传输的数据量。请注意，这只是一个简单的示例，实际的网速可能会受到其他因素的影响，例如网络拥塞、服务器响应速度等。