Image Filter View Controller

02. TH FilterViewController.m

#import "FISViewController.h"
@interface FISViewController ()

@property(strong, nonatomic) CIContext *context;
@property(strong, nonatomic) CIFilter *filter;
@property(strong, nonatomic) CIImage *beginImage;
@property(strong, nonatomic) NSMutableArray *arrayOfFilters;
@property(strong, nonatomic) NSString *filtersName;

@end

@implementation FISViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.theImageView.image = self.imageToProcess;
    self.filterNamesPicker.delegate=self;
    self.filterNamesPicker.dataSource =self;
    
    FISFilterObject *oneObject = [[FISFilterObject alloc] initWithName:@"CISepiaTone"];
    FISFilterObject *twoObject = [[FISFilterObject alloc] initWithName:@"CIToneCurve"];
    FISFilterObject *threeObject = [[FISFilterObject alloc] initWithName:@"CIColorMatrix"];
    
    FISFilterObject *fourObject = [[FISFilterObject alloc] initWithName:@"CIHueAdjust"];
    FISFilterObject *fiveObject = [[FISFilterObject alloc] initWithName:@"CIDotScreen"];
    FISFilterObject *sixObject = [[FISFilterObject alloc] initWithName:@"CIHoleDistortion"];
    
    FISFilterObject *sevenObject = [[FISFilterObject alloc] initWithName:@"CIGaussianBlur"];
    FISFilterObject *eightObject = [[FISFilterObject alloc] initWithName:@"Mutiple Filters"];
    FISFilterObject *nineObject = [[FISFilterObject alloc] initWithName:@"CIGammaAdjust"];
    
    NSArray *filters =@[oneObject, twoObject, threeObject, fourObject, fiveObject, sixObject, sevenObject,eightObject, nineObject];
    
    self.arrayOfFilters = [[NSMutableArray alloc] initWithArray:filters];

    
	// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
    
    return 1;
    
}

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
    
    return  [self.arrayOfFilters count];
    //NSLog(@"The number of filters %d", [self.arrayOfFilters count]);
}


-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    
    FISFilterObject *theObject= self.arrayOfFilters[row];
   // NSLog(@"the row number is %d", row );
    
   // NSLog(@"The filter Name is %@", theObject.filterName);
    return theObject.filterName;
    
}

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
    
    FISFilterObject *filters = self.arrayOfFilters[row];
    self.filtersName = filters.filterName;
    
    
}

- (IBAction)sliderEffect:(id)sender {
    
    UISlider *mySlider = (UISlider *)sender;
    
    float theValue = mySlider.value;
    
    self.context = [CIContext contextWithOptions:nil];
    
      NSInteger number = [self.filterNamesPicker selectedRowInComponent:0];
       FISFilterObject *temp= self.arrayOfFilters[number];
    NSLog(@"Filter Name %@", temp.filterName);
    
    if ([self.filtersName isEqualToString:@"CISepiaTone" ]) {
        
        self.beginImage = [[CIImage alloc] initWithImage: self.imageToProcess];
        CIFilter * blurFilter = [CIFilter filterWithName:self.filtersName];
        
        [blurFilter setValue:self.beginImage forKey:kCIInputImageKey];
        [blurFilter setValue:@(theValue) forKey:@"inputIntensity"];
        
        
        CGImageRef ref = [self.context createCGImage:blurFilter.outputImage fromRect:[blurFilter.outputImage extent]];
        
        self.theImageView.image = [UIImage imageWithCGImage:ref];
        
        CGImageRelease(ref);
        
    }else if ([self.filtersName isEqualToString:@"CIToneCurve"]){
        
        
        self.beginImage = [[CIImage alloc] initWithImage: self.imageToProcess];
        
        CIFilter * blurFilter = [CIFilter filterWithName:self.filtersName];
        
        [blurFilter setDefaults];
        [blurFilter setValue:self.beginImage forKey:kCIInputImageKey];
        [blurFilter setValue:[CIVector vectorWithX:0.0  Y:0.0] forKey:@"inputPoint0"]; // default
        [blurFilter setValue:[CIVector vectorWithX:0.27 Y:0.26] forKey:@"inputPoint1"];
        [blurFilter setValue:[CIVector vectorWithX:theValue  Y:0.80] forKey:@"inputPoint2"];
        [blurFilter setValue:[CIVector vectorWithX:0.7  Y:1.0] forKey:@"inputPoint3"];
        [blurFilter setValue:[CIVector vectorWithX:1.0  Y:theValue] forKey:@"inputPoint4"]; // default
        
        CGImageRef ref = [self.context createCGImage:blurFilter.outputImage fromRect:[blurFilter.outputImage extent]];
        
        self.theImageView.image = [UIImage imageWithCGImage:ref];
        
        CGImageRelease(ref);
        
        
    }else if ([self.filtersName isEqualToString:@"CIColorMatrix"]){
        
        
        self.beginImage = [[CIImage alloc] initWithImage: self.imageToProcess];
        
        
        
        CIFilter *filterColorMatrix = [CIFilter filterWithName:@"CIColorMatrix"];
        [filterColorMatrix setValue:self.beginImage forKey:kCIInputImageKey];
        
        CIVector *greenVector = [CIVector vectorWithX:mySlider.value Y:mySlider.value Z:0 W:0];
        [filterColorMatrix setValue:greenVector forKey:@"inputGVector"];
        
        
        CGImageRef ref = [self.context createCGImage:filterColorMatrix.outputImage fromRect:[filterColorMatrix.outputImage extent]];
        //
        self.theImageView.image = [UIImage imageWithCGImage:ref];
        //
        CGImageRelease(ref);
        
        
    }else if ([self.filtersName isEqualToString:@"CIHueAdjust"]){
        
        
        self.beginImage = [[CIImage alloc] initWithImage: self.imageToProcess];
        
        CIFilter * blurFilter = [CIFilter filterWithName:self.filtersName];
        
        [blurFilter setValue:self.beginImage forKey:kCIInputImageKey];
        [blurFilter setValue:[NSNumber numberWithDouble:-2*M_PI/theValue] forKey:@"inputAngle"];
        
        CGImageRef ref = [self.context createCGImage:blurFilter.outputImage fromRect:[blurFilter.outputImage extent]];
        
        self.theImageView.image = [UIImage imageWithCGImage:ref];
        
        CGImageRelease(ref);
        
        
    }else if ([self.filtersName isEqualToString:@"CIDotScreen"]){
        
        self.beginImage = [[CIImage alloc] initWithImage: self.imageToProcess];
        
        CIFilter * blurFilter = [CIFilter filterWithName:self.filtersName];
        
        [blurFilter setValue:self.beginImage forKey:@"inputImage"];
        
        [blurFilter setValue:[NSNumber numberWithFloat:theValue+20.00] forKey:@"inputWidth"];
        
        [blurFilter setValue:[NSNumber numberWithFloat:theValue] forKey:@"inputAngle"];
        
        [blurFilter setValue:[NSNumber numberWithFloat:0.70] forKey:@"inputSharpness"];
        
        CGImageRef ref = [self.context createCGImage:blurFilter.outputImage fromRect:[blurFilter.outputImage extent]];
        
        self.theImageView.image = [UIImage imageWithCGImage:ref];
        
        CGImageRelease(ref);
        
    }else if ([self.filtersName isEqualToString:@"CIHoleDistortion"]){
        
        self.beginImage = [[CIImage alloc] initWithImage: self.imageToProcess];
        
        CIFilter * blurFilter = [CIFilter filterWithName:self.filtersName];
        
        
        [blurFilter setValue:self.beginImage forKey:@"inputImage"];
        
        [blurFilter setValue:[CIVector vectorWithX:150 Y:150] forKey:@"inputCenter"];
        [blurFilter setValue:[NSNumber numberWithFloat:theValue +100] forKey:@"inputRadius"];
        
        CGImageRef ref = [self.context createCGImage:blurFilter.outputImage fromRect:[blurFilter.outputImage extent]];
        
        self.theImageView.image = [UIImage imageWithCGImage:ref];
        
        CGImageRelease(ref);
        
        
    }else if ([self.filtersName isEqualToString:@"CIGaussianBlur"]){
        
        self.beginImage = [[CIImage alloc] initWithImage: self.imageToProcess];
        
        CIFilter * blurFilter = [CIFilter filterWithName:self.filtersName];
        
        
        blurFilter = [CIFilter filterWithName: @"CIGaussianBlur"];
        [blurFilter setValue:self.beginImage forKey: @"inputImage"];
        [blurFilter setValue:[NSNumber numberWithFloat: theValue +1] forKey: @"inputRadius"];
        CIImage *resultImage = [blurFilter valueForKey: @"outputImage"];
        
        
        CGImageRef ref = [self.context createCGImage:resultImage fromRect:[resultImage extent]];
        
        self.theImageView.image = [UIImage imageWithCGImage:ref];
        
        CGImageRelease(ref);
        
        
        
    }else if ([self.filtersName isEqualToString:@"Mutiple Filters"]){
        
        self.beginImage = [[CIImage alloc] initWithImage: self.imageToProcess];
        
        
        CIFilter *filterColorMatrix = [CIFilter filterWithName:@"CIColorMatrix"];
        [filterColorMatrix setValue:self.beginImage forKey:kCIInputImageKey];
        
        CIVector *greenVector = [CIVector vectorWithX:1 Y:theValue Z:0 W:0];
        [filterColorMatrix setValue:greenVector forKey:@"inputGVector"];
        
        CIImage *result = [filterColorMatrix outputImage];
        
        
        CIFilter *filterBloom = [CIFilter filterWithName:@"CIBloom"];
        [filterBloom setValue:result forKey:kCIInputImageKey];
        [filterBloom setValue:[NSNumber numberWithDouble:5.0] forKey:@"inputRadius"];
        [filterBloom setValue:[NSNumber numberWithDouble:2.0] forKey:@"inputIntensity"];
        result = [filterBloom valueForKey:kCIOutputImageKey];
        
        CGImageRef ref = [self.context createCGImage:result fromRect:[result extent]];
        
        self.theImageView.image = [UIImage imageWithCGImage:ref];
        
        CGImageRelease(ref);
        
        
    }else if ([self.filtersName isEqualToString:@"CIGammaAdjust"]){
        
        self.beginImage = [[CIImage alloc] initWithImage: self.imageToProcess];
        
        CIFilter * blurFilter = [CIFilter filterWithName:self.filtersName];
        
        [blurFilter setValue:self.beginImage forKey:@"inputImage"];
        
        [blurFilter setValue:[NSNumber numberWithFloat:theValue+1] forKey:@"inputPower"];
        
        
        CGImageRef ref = [self.context createCGImage:blurFilter.outputImage fromRect:[blurFilter.outputImage extent]];
        
        self.theImageView.image = [UIImage imageWithCGImage:ref];
        
        CGImageRelease(ref);
        
        
    }else{
        
        return;
    }
    

    
}
- (IBAction)saveButtonTapped:(id)sender {
    
    
    self.savedImage = self.theImageView.image;
   
    [self.delegate setFilteredImage:self.savedImage];
    
    [self dismissViewControllerAnimated:YES completion:nil];
    
}

@end

Cowritten with Steve Zhou