如何在運行時找到CIFIlter類別？

Question

我正在使用此[CIFilter filterNamesInCategories:nil]來獲取可用過濾器的列表，但是如何獲取類別列表？ 我當然可以通過過濾器列表進行枚舉，並讀取每個過濾器中的類別來構建一個集合，但是有更好的方法嗎？

Answer 1

我是這樣做的：

NSMutableSet  * categories = [NSMutableSet set];
for (NSString* filterName in [CIFilter filterNamesInCategories:nil])
{
    for (id value in  [[[CIFilter filterWithName:filterName] attributes] 
    valueForKey:@"CIAttributeFilterCategories"]) {
        [categories addObject:value];
    }
}
NSLog(@"%@", categories);

Answer 2

Swift 4.2版本就在這里。

  import CoreImage

  var results = NSMutableSet()
  let categories = CIFilter.filterNames(inCategory: nil)

  for category in categories {
      let attributes = CIFilter(name: category)?.attributes
      let filterCategories = attributes!["CIAttributeFilterCategories"]
      results.addObjects(from: filterCategories as! [Any])
  }

  print(results)

Answer 3

這來自文檔：

過濾類別鍵

過濾器類別。

extern NSString *kCICategoryDistortionEffect;
extern NSString *kCICategoryGeometryAdjustment;
extern NSString *kCICategoryCompositeOperation;
extern NSString *kCICategoryHalftoneEffect;
extern NSString *kCICategoryColorAdjustment;
extern NSString *kCICategoryColorEffect;
extern NSString *kCICategoryTransition;
extern NSString *kCICategoryTileEffect;
extern NSString *kCICategoryGenerator;
extern NSString *kCICategoryReduction;
extern NSString *kCICategoryGradient;
extern NSString *kCICategoryStylize;
extern NSString *kCICategorySharpen;
extern NSString *kCICategoryBlur;
extern NSString *kCICategoryVideo;
extern NSString *kCICategoryStillImage;
extern NSString *kCICategoryInterlaced;
extern NSString *kCICategoryNonSquarePixels;
extern NSString *kCICategoryHighDynamicRange ;
extern NSString *kCICategoryBuiltIn;

至於在運行時獲取它們，我沒有看到任何其他選項，除了枚舉它們。 這是答案