ImageScout is a Swift implementation of fastimage. It allows you to find the size and type of a remote image by downloading as little as possible.
Why?
Sometimes you need to know the size of a remote image before downloading it, such as
using a custom layout in a UICollectionView
.
How?
ImageScout parses the image data as it is downloaded. As soon as it finds out the size and type of image, it stops the download. The downloaded data is below 60 KB in most cases.
Install
Use Git submodules. You want to add the file(s) in source
to your Xcode project.
Usage
The only method you will be using is scoutImageWithURI()
, with the following full signature:
func scoutImageWithURI(URI: String, completion: (NSError?, CGSize, ScoutedImageType) -> ())
Here's an example:
let scout = ImageScout()
scout.scoutImageWithURI("http://.../image-scout-logo.png") { error, size, type in
if let unwrappedError = error {
println(unwrappedError.code)
} else {
println("Size: \(size)")
println("Type: \(type.rawValue)")
}
}
If the image is not successfully parsed, the error will contain more info about the reason.
In that case, the size is going to be CGSizeZero
and the type .Unsupported
.
- Error code 100: Invalid URI parameter.
- Error code 101: Image is corrput or malformatted.
- Error code 102: Not an image or unsopported image format URL.
Compatibility
- iOS 7.0 and above.
- Compiles with Xcode 6.1 and above.
License
See LICENSE.