如何将 int 数组中的元素与整数进行比较？

Question

我想将包含 int 值的数组与数字进行比较

示例 [1,2,30,1,40,200,10,500]

我该怎么做？

提前感谢

我这样做了，但它说操作数无效：

if ([placeName count])
{
    for (int i =0; i < [placeName count]; i++) 
    {
        NSArray *sortedArray=[placeName sortedArrayUsingFunction:intSort context:NULL];
        self.placeName = [NSMutableArray arrayWithArray:sortedArray];

        NSMutableArray *tempArray = [sortedArray objectAtIndex:i];

        NSDecimalNumber *Distance = [tempArray objectForKey:@"distance"];

        NSMutableArray *intDistanse=[Distance intValue];
        DLog(@"Distance%d", intDistanse);

        NSMutableArray *intDistanse=[Distance intValue];
        DLog(@"Distance%d", intDistanse);

        for(int j = 0; j < [intDistanse count]; j++)
        {
             if ( intDistanse[j] < 500 ) //here its says error
             {

                DLog(@"success");

             }
        }
    }
}

Answer 1

什么样的数组？ NSArray 还是语言数组？

最简单的方法是循环。在不知道数组类型的情况下，这是伪代码。

for(int i = 0; i < arrayCount; i++)
    if ( array[i] < 500 )
         .... got an element less than 500 ....

---

代码没有意义：

• 该代码应该生成大量编译器警告；每个警告都表示应该修复的错误。另外，尝试“构建和分析”。

• 每次循环都在对数组进行排序；浪费资源，没有意义

• 输入为 NSMutableArray* 的所有内容都没有意义；你真的有一个数组数组吗？

• ... 调用 objectForKey: 除了 NSDictionary 以外的任何东西都不起作用

• intValue 返回一个 (int)，而不是 NSMutableArray*

• 如果 intDistance 是一个 (int)，那么它应该只是 (intDistance

总的来说，我建议你退后一步，回顾一下Objective-C language guide 和一堆工作示例。

Answer 2

通常，您循环数组中的每个元素，检查每个元素是否小于 500。

例如：

int i;
for (i=0; i < THE_SIZE_OF_THE_ARRAY; ++i)
{
  if (array[i] < 500)
  {
    /* Do something */
  }
}

Answer 3

如果您想查看是否有至少一项符合您的条件：

bool found = false;
for(int i = 0; i < sizeof(example)/sizeof(example[0]); ++i)
{
    if(example[i] < 500)
    {
        found = true;
        break;
    }
}

如果您想检查所有项目是否符合您的条件：

bool found = true;
for(int i = 0; i < sizeof(example)/sizeof(example[0]); ++i)
{
    if(example[i] >= 500)
    {
        found = false;
        break;
    }
}

Answer 4

确实找到了类型转换的解决方案：

NSMutableArray *tempArray = [sortedArray objectAtIndex:i];
        //DLog(@"sortedArray%@", sortedArray);8=
        NSNumber *DistanceNum = [tempArray objectForKey:@"distance"];
        NSLog(@"distance%@:::",DistanceNum);
        NSInteger intDistance = (int)[DistanceNum floatValue];

        if(intDistance<500)
        {
            NSLog(@"h:)");
            NSString *notifications =@"Yes";
            [[AppHelper mDataManager] setObject:notifications forKey:@"notifications"]; 

            NSLog(@"notifications:%@",notifications);
            RemindMeViewController *object = [[RemindMeViewController alloc] initWithNibName:@"RemindMeViewController" bundle:nil];
            //  RemindMeViewController *object=[[RemindMeViewController alloc]initWithNibName];

            NSLog(@"notifications set");
            [object scheduleNotification];
        }

Answer 5

你可以很容易地做到这一点，只需实现观察者进行比较。下面只是一个实现自定义观察者比较的例子

@implementation NSArray (KVO)

- (void)addObserver:(NSObject *)observer toObjectsAtIndexes:(NSIndexSet *)indexes forKeyPath:(NSString *)keyPath options:(NSKeyValueObservingOptions)options context:(void *)context
{
    NSUInteger idx=[indexes firstIndex];
    while(idx!=NSNotFound)
    {
        [[self objectAtIndex:idx] addObserver:observer
                                   forKeyPath:keyPath
                                      options:options
                                      context:context];
        idx=[indexes indexGreaterThanIndex:idx];
    }
}

- (void)removeObserver:(NSObject *)observer fromObjectsAtIndexes:(NSIndexSet *)indexes forKeyPath:(NSString *)keyPath
{
    NSUInteger idx=[indexes firstIndex];
    while(idx!=NSNotFound)
    {
        [[self objectAtIndex:idx] removeObserver:observer
                                      forKeyPath:keyPath];
        idx=[indexes indexGreaterThanIndex:idx];
    }
}

-(void)addObserver:(id)observer forKeyPath:(NSString*)keyPath options:(NSKeyValueObservingOptions)options context:(void*)context;
{
    if([isa instanceMethodForSelector:_cmd]==[NSArray instanceMethodForSelector:_cmd])
        NSRaiseException(NSInvalidArgumentException,self,_cmd,@"not supported for key path %@ (observer was %@)", keyPath, observer);
    else
        [super addObserver:observer
                forKeyPath:keyPath
                   options:options
                   context:context];
}

-(void)removeObserver:(id)observer forKeyPath:(NSString*)keyPath;
{
    if([isa instanceMethodForSelector:_cmd]==[NSArray instanceMethodForSelector:_cmd])
        NSRaiseException(NSInvalidArgumentException,self,_cmd,@"not supported for key path %@ (observer was %@)", keyPath, observer);   
    else
        [super removeObserver:observer
                   forKeyPath:keyPath];
}
@end