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UTI
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cockscomb
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No content
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No content
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gion-matsuri.jpg
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ion-matsuri.jpg
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JPEG
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JPEG
image/jpeg
.jpeg public.jpeg
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PNG
image/png
.png public.png
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PNG
image/png
.png public.png
Extension MIME Type UTI
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File Types
have many representations
• Extension — .jpeg
• MIME Type — image/jpeg
• UTI — public.jpeg
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File Types
have many representations
• Extension
• for file name
• MIME Type
• for Internet (Content-Type)
• UTI?
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Uniform Type Identifier
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Uniform Type Identifier
• Used inside iOS/OS X
• Have inheritance
• public.content/public.data → public.image
→ public.jpeg
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let manager = PHImageManager.defaultManager()
manager.requestImageDataForAsset(asset,
options: options) {
(data, dataUTI, orientation, info) in
// Do something
}
Get image data from Photos
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let manager = PHImageManager.defaultManager()
manager.requestImageDataForAsset(asset,
options: options) {
(data, dataUTI, orientation, info) in
// Do something
}
Get image data from Photos
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UTI → Extension
UTTypeCopyPreferredTagWithClass(
"public.jpeg",
kUTTagClassFilenameExtension
).takeRetainedValue()
// jpeg
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MIME Type → UTI
UTTypeCreatePreferredIdentifierForTag(
kUTTagClassMIMEType,
"image/jpeg",
nil
).takeRetainedValue()
// public.jpeg
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MIME Type → Extension
func extensionFromMIMEType(MIMEType: String) -> String
{
let uti = UTTypeCreatePreferredIdentifierForTag(
kUTTagClassMIMEType,
MIMEType,
nil
).takeRetainedValue()
let ext = UTTypeCopyPreferredTagWithClass(
uti,
kUTTagClassFilenameExtension
).takeRetainedValue()
return ext as String
}
extensionFromMIMEType("image/jpeg")
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cockscomb/UTIKit
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MIME Type → Extension
func extensionFromMIMEType(MIMEType: String) -> String
{
let uti = UTTypeCreatePreferredIdentifierForTag(
kUTTagClassMIMEType,
MIMEType,
nil
).takeRetainedValue()
let ext = UTTypeCopyPreferredTagWithClass(
uti,
kUTTagClassFilenameExtension
).takeRetainedValue()
return ext as String
}
extensionFromMIMEType("image/jpeg")
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MIME Type → Extension
import UTIKit
UTI(MIMEType: "image/jpeg").filenameExtension
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Create your file type
CFBundleTypeIconFiles
CFBundleTypeName
Awesome File Format
LSItemContentTypes
info.cockscomb.awesome
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Uniform Type Identifier
• Can convert to file extension and MIME Type
• Can be simple to use with UTIKit ✌
• Can be defined your own one
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