objective-c - 如何每秒生成一个随机数并获得平均值？

Question

我很难尝试每秒获取一个随机数并记录它以及它的运行平均值。

代码：

-(void)generateNumber:(NSTimer *)numberEachSecond
{        
    NSUInteger random = (arc4random() % 1000) +1;        
    NSMutableArray *listOfNumbers = [[NSMutableArray alloc]init];        
    NSNumber *number = [NSNumber numberWithInteger:random];        
    [listOfNumbers addObject:number];        

    // NSNumber *counter = 0;        
    for (NSNumber *generatedNumber in listOfNumbers) 
    {  
        NSLog(@"%@",generatedNumber);            
    }        
    NSLog(@"%@", listOfNumbers);        
}

Answer 1

此代码将每秒生成一个随机数，并计算所有
生成的数字的平均值。

在.h

NSMutableArray *listOfNumbers;

在.m

-(void)viewDidLoad{
    listOfNumbers = [[NSMutableArray alloc]init];
    [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(generateNumber:) userInfo:nil repeats:YES];
}


-(void)generateNumber:(NSTimer *)numberEachSecond
{
NSUInteger random = (arc4random() % 1000) +1;
NSNumber *number = [NSNumber numberWithInteger:random];
[listOfNumbers addObject:number];
int total=0;
NSLog(@"%@",generatedNumber);  
for (NSNumber *generatedNumber in listOfNumbers)
{
    total=total + [generatedNumber intValue];
}

int average= total/[listOfNumbers count];
NSLog(@"average -- %d", average);
}

Answer 2

您生成随机数的逻辑似乎不错，但您不应该每次都将数组分配到该函数generateNumber中，它应该类似于，

alloc 数组某处一次或需要时，可能在viewDidLoad？

listOfNumbers = [[NSMutableArray alloc]init]; //listOfNumbers should be instance variable

-(void)generateNumber:(NSTimer *)numberEachSecond 
{
    NSUInteger random = (arc4random() % 1000) +1;
    NSNumber *number = [NSNumber numberWithInteger:random];
    [listOfNumbers addObject:number];
}

你可以在函数之外的任何地方使用它，

NSLog(@"%@", listOfNumbers);