Building MXMetricPayload

payload_build.m

    // Build payload
    MXMetricPayload *payload = [MXMetricPayload alloc];
    SEL selector = @selector(initWithAppVersion:withMutipleAppVersions:withTimeStampBegin:withTimeStampEnd:);
    NSMethodSignature *signature = [MXMetricPayload instanceMethodSignatureForSelector:selector];
    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
    [invocation setTarget:payload];
    [invocation setSelector:selector];
    
    NSString *appVersion = @"10";
    NSArray *appVersions = @[appVersion];
    NSDate *startDate = [NSDate date];
    NSDate *endDate = [NSDate date];
    [invocation setArgument:&appVersion atIndex:2];
    [invocation setArgument:&appVersions atIndex:3];
    [invocation setArgument:&startDate atIndex:4];
    [invocation setArgument:&endDate atIndex:5];
    
    [invocation invoke];
    
    // Add metrics
    MXCPUMetric *cpuMetric = [MXCPUMetric alloc];
    [cpuMetric performSelector:@selector(initWithCumulativeCPUTimeMeasurement:) withObject:[NSNumber numberWithDouble:42]];
    [payload performSelector:@selector(setCpuMetrics:) withObject:cpuMetric];
    
    // Put payload to caches
    NSString *path = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES)[0];
    path = [path stringByAppendingPathComponent:@"Caches/MetricKit/Reports"];
    
    NSError *error = nil;
    if(![[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:&error]) {
        NSLog(@"Failed to create directory \"%@\". Error: %@", path, error);
        return;
    }
    
    NSString *filePath = [path stringByAppendingPathComponent:@"report"];
    [NSKeyedArchiver archiveRootObject:payload toFile:filePath];