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Generate Metadata Exif for GPS
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// | |
// Generate EXIF GPS metadata | |
// Swift 3 | |
// Exif Version 2.2.0.0 supports decimal degrees | |
import Foundation | |
import CoreLocation | |
import ImageIO | |
extension CLLocation { | |
func exifMetadata(heading: CLHeading? = nil) -> NSMutableDictionary { | |
let GPSMetadata = NSMutableDictionary() | |
let altitudeRef = Int(self.altitude < 0.0 ? 1 : 0) | |
let latitudeRef = self.coordinate.latitude < 0.0 ? "S" : "N" | |
let longitudeRef = self.coordinate.longitude < 0.0 ? "W" : "E" | |
// GPS metadata | |
GPSMetadata[(kCGImagePropertyGPSLatitude as String)] = abs(self.coordinate.latitude) | |
GPSMetadata[(kCGImagePropertyGPSLongitude as String)] = abs(self.coordinate.longitude) | |
GPSMetadata[(kCGImagePropertyGPSLatitudeRef as String)] = latitudeRef | |
GPSMetadata[(kCGImagePropertyGPSLongitudeRef as String)] = longitudeRef | |
GPSMetadata[(kCGImagePropertyGPSAltitude as String)] = Int(abs(self.altitude)) | |
GPSMetadata[(kCGImagePropertyGPSAltitudeRef as String)] = altitudeRef | |
GPSMetadata[(kCGImagePropertyGPSTimeStamp as String)] = self.timestamp.isoTime() | |
GPSMetadata[(kCGImagePropertyGPSDateStamp as String)] = self.timestamp.isoDate() | |
GPSMetadata[(kCGImagePropertyGPSVersion as String)] = "2.2.0.0" | |
if let heading = heading { | |
GPSMetadata[(kCGImagePropertyGPSImgDirection as String)] = heading.trueHeading | |
GPSMetadata[(kCGImagePropertyGPSImgDirectionRef as String)] = "T" | |
} | |
return GPSMetadata | |
} | |
} | |
extension Date { | |
func isoDate() -> String { | |
let f = DateFormatter() | |
f.timeZone = TimeZone(abbreviation: "UTC") | |
f.dateFormat = "yyyy:MM:dd" | |
return f.string(from: self) | |
} | |
func isoTime() -> String { | |
let f = DateFormatter() | |
f.timeZone = TimeZone(abbreviation: "UTC") | |
f.dateFormat = "HH:mm:ss.SSSSSS" | |
return f.string(from: self) | |
} | |
} |
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