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https://github.com/jhurray/Swift2-Protocol-Extension-Example
Playground showing how to use swift2 protocol extensions to render errors in UIViews and UIViewControllers without subclassing
https://github.com/jhurray/Swift2-Protocol-Extension-Example
Last synced: 2 months ago
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Playground showing how to use swift2 protocol extensions to render errors in UIViews and UIViewControllers without subclassing
- Host: GitHub
- URL: https://github.com/jhurray/Swift2-Protocol-Extension-Example
- Owner: jhurray
- License: mit
- Created: 2015-09-27T23:15:40.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2016-06-07T20:47:11.000Z (about 8 years ago)
- Last Synced: 2024-01-28T08:08:13.845Z (5 months ago)
- Language: Swift
- Size: 153 KB
- Stars: 38
- Watchers: 4
- Forks: 3
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Lists
- Awesome-Swift-Playgrounds - Swift 2.0 Protocol Extension Example - Showing how to use Swift2 protocol extensions to render errors in UIViews and UIViewControllers without subclassing or creating classes. ⏳ (UIKit And Graphics / Machine Learning)
README
# Swift 2.0 Protocol Extension Example
Playground showing how to use Swift2 protocol extensions to render errors in UIViews and UIViewControllers without subclassing or creating classes
**UIViewControllers** will render an error as a toast banner
**UIViews** will render an error by adding a generic error label to the views top right corner.
This was inspired by a [sweet article](http://krakendev.io/blog/subclassing-can-suck-and-heres-why) by [KrakenDev](http://krakendev.io)
```swift
import UIKit
import XCPlayground
struct ErrorOptions {
let message: String
let tintColor: UIColor
init(message: String = "Error!", tintColor: UIColor = UIColor.clearColor()) {
self.message = message
self.tintColor = tintColor
}
}
typealias ErrorRenderingCompletionBlock = ()->()
protocol ErrorPopoverRenderer {
func presentError(errorOptions: ErrorOptions)
func presentError(errorOptions: ErrorOptions, completion : ErrorRenderingCompletionBlock?)
}
extension ErrorPopoverRenderer {
func presentError(errorOptions: ErrorOptions = ErrorOptions()) {
self.presentError(errorOptions, completion: nil)
}
}
extension ErrorPopoverRenderer where Self: UIViewController {
func presentError(errorOptions: ErrorOptions = ErrorOptions(), completion : ErrorRenderingCompletionBlock?) {
let errorBanner = UILabel()
errorBanner.backgroundColor = errorOptions.tintColor
errorBanner.textAlignment = .Center
errorBanner.adjustsFontSizeToFitWidth = true
errorBanner.font = UIFont.systemFontOfSize(20.0)
errorBanner.textColor = UIColor.whiteColor()
errorBanner.text = errorOptions.message
let height : CGFloat = 50
errorBanner.frame = CGRect(x: 0, y: -height, width: CGRectGetWidth(self.view.bounds), height: height)
self.view.addSubview(errorBanner)
UIView.animateWithDuration(0.8, animations: { () -> Void in
errorBanner.transform = CGAffineTransformMakeTranslation(0, height)
}) { (done1) -> Void in
UIView.animateWithDuration(0.8, delay: 0.5, options: UIViewAnimationOptions.CurveEaseOut, animations: { () -> Void in
errorBanner.transform = CGAffineTransformIdentity
}, completion: { (done2) -> Void in
errorBanner.removeFromSuperview()
if let completionBlock = completion {
completionBlock()
}
})
}
}
}
extension ErrorPopoverRenderer where Self: UIView {
func presentError(errorOptions: ErrorOptions = ErrorOptions(), completion : ErrorRenderingCompletionBlock?) {
let errorBanner = UILabel()
errorBanner.backgroundColor = errorOptions.tintColor
errorBanner.textAlignment = .Center
errorBanner.adjustsFontSizeToFitWidth = true
errorBanner.font = UIFont.systemFontOfSize(18.0)
errorBanner.text = "!"
errorBanner.textColor = UIColor.redColor()
let size : CGFloat = 32.0
let padding : CGFloat = 8.0
errorBanner.layer.cornerRadius = size/2.0
errorBanner.layer.borderColor = UIColor.redColor().CGColor
errorBanner.layer.borderWidth = 1.0
errorBanner.frame = CGRect(x: CGRectGetWidth(self.bounds) - size - padding, y: padding, width: size, height: size)
self.addSubview(errorBanner)
if let completionBlock = completion {
completionBlock()
}
}
}
extension UIViewController : ErrorPopoverRenderer {}
extension UIView : ErrorPopoverRenderer {}
let viewController = UIViewController()
viewController.view.frame = CGRect(x: 0, y: 0, width: 375, height: 667)
viewController.view.backgroundColor = UIColor.whiteColor()
XCPShowView("Controller View", view: viewController.view)
let errorOptions = ErrorOptions(message: "OMG an error!", tintColor: UIColor.redColor())
viewController.presentError(errorOptions) { () -> () in
viewController.view.presentError()
}
```