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[英]How to get UIImage metadata from UIImagePickerController in swift ? like ".location"
[英]iOS Swift. How to get a GPS metadata from just a UIImage (NSURL)?
引用僅具有NSURL的圖像。 如何從中獲取GPS元數據? 當然,我可以從NSURL加載UIImage,但那又怎么樣?
我在這里找到的大多數答案都是關於UIImagePicker,然后使用ALAssets,但我沒有這樣的選擇。
回答我自己的問題。 獲取GPS元數據的記憶有效且快速的方法是
let options = [kCGImageSourceShouldCache as String: kCFBooleanFalse]
if let data = NSData(contentsOfURL: url), imgSrc = CGImageSourceCreateWithData(data, options) {
let metadata = CGImageSourceCopyPropertiesAtIndex(imgSrc, 0, options) as Dictionary
let gpsData = metadata[kCGImagePropertyGPSDictionary] as? [String : AnyObject]
}
第二個選擇是
if let img = CIImage(contentsOfURL: url), metadata = img.properties(),
gpsData = metadata[kCGImagePropertyGPSDictionary] as? [String : AnyObject] { … }
它在Swift中看起來更好但使用更多內存(通過Profiler測試)。
Swift 3的更新版本:
let options = [kCGImageSourceShouldCache as String: kCFBooleanFalse]
if let data = NSData(contentsOfURL: url), let imgSrc = CGImageSourceCreateWithData(data, options as CFDictionary) {
let metadata = CGImageSourceCopyPropertiesAtIndex(imgSrc, 0, options as CFDictionary) as? [String : AnyObject]
if let gpsData = metadata?[kCGImagePropertyGPSDictionary as String] {
//do interesting stuff here
}
}
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