iOS -- Core Image

• CIContext. All of the processing of a core image is done in a CIContext. This is somewhat similar to a Core Graphics or OpenGL context.
• CIImage. This class hold the image data. It can be creating from a UIImage, from an image file, or from pixel data.
• CIFilter. The filter class has a dictionary that defines the attributes of the particular filter that it represents. Examples of filters are vibrance filters, color inversion filters, cropping filters, and much more.

1.declare

@implementation ViewController

{

    CIContext *context;

    CIFilter *filter;

    CIImage *beginImage;

}

2. change

    NSString *filePath = [[NSBundle mainBundle]pathForResource:@"image" ofType:@"png"];

    

    NSURL *fileNameAndPath = [NSURL fileURLWithPath:filePath];

    

    beginImage = [CIImage imageWithContentsOfURL:fileNameAndPath];

    

    context = [CIContext contextWithOptions:nil];

    

    filter = [CIFilter filterWithName:@"CISepiaTone" keysAndValues:kCIInputImageKey,beginImage,@"inputIntensity",@0.8, nil];

    

    CIImage *outputImage = [filter outputImage];

    

    CGImageRef cgimg = [context createCGImage:outputImage fromRect:[outputImage extent]];

    UIImage *newImage = [UIImage imageWithCGImage:cgimg];

    

    self.imageView.image = newImage;

iOS - URL SCHEME

To configure URL SCHEME

In Xcode project, info.

Open the app in code:

  NSString *format = @"birdland://";

    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:format]];

   

    [[UIApplication sharedApplication] openURL:url];