從基於cgfloat的表查找中返回最接近的8個cgfloat

Question

我正在嘗試創建此方法。 叫這個

-(NSMutableArray*) getEightClosestSwatchesFor:(CGFloat)hue
{
NSString *myFile = [[NSBundle mainBundle] pathForResource:@"festival101" ofType:@"plist"];
NSMutableArray* myArray = [NSArray arrayWithContentsOfFile:myFile];

for (NSDictionary *dict in myArray) 
{
    NSLog(@"[plistData valueForKey:aKey] string] is %f", [[dict valueForKey:@"hue"] floatValue]) ;

}

return myArray;

}

差不多，我正在將cgfloat傳遞給此方法，然后需要檢查具有100個元素的色相鍵的plist文件。 我需要將我的色相與所有色相進行比較，並獲得8個最接近的色相，最后將它們包裝到數組中並返回。

什么是最有效的方法？ 提前致謝。

Answer 1

如果有人感興趣，這是我的方法。 隨時對此發表評論。

-(NSArray*)eightClosestSwatchesForHue:(CGFloat)hue
{

NSMutableArray *updatedArray  = [[NSMutableArray alloc] initWithCapacity:100];
NSString *myFile = [[NSBundle mainBundle] pathForResource:@"festival101" ofType:@"plist"];
NSMutableArray* myArray = [NSArray arrayWithContentsOfFile:myFile];



for (NSDictionary *dict in myArray) 
{
    CGFloat differenceHue = fabs(hue - [[dict valueForKey:@"hue"] floatValue]);
    //create  a KVA for the differenceHue here and  then add it to the dictionary and add this dictionary to the array.
    NSDictionary* tempDict = [NSDictionary dictionaryWithObjectsAndKeys:
    [dict valueForKey:@"id"], @"id",
    [NSNumber numberWithFloat:differenceHue], @"differenceHue",
     [dict valueForKey:@"color"], @"color",
    nil];

    [updatedArray addObject:tempDict]; 
}



//now we have an array of dictioneries with values we want. we need to sort this from little to big now.
NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"differenceHue"  ascending:YES];
[updatedArray sortUsingDescriptors:[NSArray arrayWithObjects:descriptor,nil]];

[descriptor release];

//now get the first 8 elements and get rid of the remaining.
NSArray *finalArray = [updatedArray subarrayWithRange:NSMakeRange(0,8)];
[updatedArray release];
return finalArray;
}