CAFilter是一个私有类，可以通过设置layer.filters实现实时滤镜效果，不过私有类API有被拒风险。
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| ///CAFilter
@interface CAFilter : NSObject <NSSecureCoding, NSCopying>
@property (readonly) NSString* type;
@property (copy) NSString* name;
@property (getter=isEnabled) BOOL enabled;
@property BOOL cachesInputImage;
+ (instancetype)filterWithType:(NSString *)type;
+ (instancetype)filterWithName:(NSString *)name;
+ (NSArray <NSString *> *)filterTypes;
- (instancetype)initWithType:(id)type;
- (instancetype)initWithName:(id)name;
- (void)setDefaults;
@end
///五行代码实现APP黑白滤镜
self.window.layer.filters = @[({
CIFilter *filter = [NSClassFromString(@"CAFilter") filterWithName:@"colorSaturate"]; // 看是 CIFilter，实际上是 CAFilter
[filter setValue:@0 forKey:@"inputAmount"];
filter;
})];
目前支持的滤镜名（iOS 13）有以下这些：
* multiplyColor
* colorAdd
* colorSubtract
* colorMonochrome
* colorMatrix
* colorHueRotate
* colorSaturate参数**inputAmount**
* colorBrightness
* colorContrast
* colorInvert
* compressLuminance
* meteor
* luminanceToAlpha
* bias
* distanceField
* gaussianBlur参数**inputRadius**
* luminanceMap
* luminanceCurveMap
* curves
* averageColor
* lanczosResize
* pageCurl
* vibrantDark
* vibrantLight
* vibrantColorMatrix
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