obj-c 实现java System.currentTimeMillis()

    NSTimeInterval time = [[NSDate date] timeIntervalSince1970];
    time *=1000.0;
    long long dTime = [[NSNumber numberWithDouble:time] longLongValue]; // 将double转为long long型
    NSString *curTime = [NSString stringWithFormat:@"%llu",dTime]; // 输出long long型
    NSLog(@"---------time:%@",curTime);