wnagrodzki/DragGestureRecognizer
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Adds DragGestureRecognizer

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This commit is contained in:
Wojciech Nagrodzki 2016-09-06 18:39:34 +02:00
parent f5c92a7dee
commit 1e9a2fc40b
Signed by: wnagrodzki
GPG key ID: E9D0EB0302264569
2 changed files with 77 additions and 0 deletions
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7
DragGestureRecognizer.xcodeproj/project.pbxproj
View file

@ -7,6 +7,7 @@
objects = {
/* Begin PBXBuildFile section */
2E0800EE1D78B2F2004371A1 /* DragGestureRecognizer.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2E0800ED1D78B2F2004371A1 /* DragGestureRecognizer.swift */; };
2EA02D0D1D78A64800FEB930 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2EA02D0C1D78A64800FEB930 /* AppDelegate.swift */; };
2EA02D0F1D78A64800FEB930 /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2EA02D0E1D78A64800FEB930 /* ViewController.swift */; };
2EA02D121D78A64800FEB930 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 2EA02D101D78A64800FEB930 /* Main.storyboard */; };
@ -34,6 +35,7 @@
/* End PBXContainerItemProxy section */
/* Begin PBXFileReference section */
2E0800ED1D78B2F2004371A1 /* DragGestureRecognizer.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = DragGestureRecognizer.swift; sourceTree = "<group>"; };
2EA02D091D78A64800FEB930 /* DragGestureRecognizer.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = DragGestureRecognizer.app; sourceTree = BUILT_PRODUCTS_DIR; };
2EA02D0C1D78A64800FEB930 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
2EA02D0E1D78A64800FEB930 /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
@ -103,6 +105,7 @@
2EA02D131D78A64800FEB930 /* Assets.xcassets */,
2EA02D151D78A64800FEB930 /* LaunchScreen.storyboard */,
2EA02D181D78A64800FEB930 /* Info.plist */,
2E0800ED1D78B2F2004371A1 /* DragGestureRecognizer.swift */,
);
path = DragGestureRecognizer;
sourceTree = "<group>";
@ -261,6 +264,7 @@
files = (
2EA02D0F1D78A64800FEB930 /* ViewController.swift in Sources */,
2EA02D0D1D78A64800FEB930 /* AppDelegate.swift in Sources */,
2E0800EE1D78B2F2004371A1 /* DragGestureRecognizer.swift in Sources */,
);
runOnlyForDeploymentPostprocessing = 0;
};
@ -505,6 +509,7 @@
2EA02D331D78A64800FEB930 /* Release */,
);
defaultConfigurationIsVisible = 0;
defaultConfigurationName = Release;
};
2EA02D341D78A64800FEB930 /* Build configuration list for PBXNativeTarget "DragGestureRecognizerTests" */ = {
isa = XCConfigurationList;
@ -513,6 +518,7 @@
2EA02D361D78A64800FEB930 /* Release */,
);
defaultConfigurationIsVisible = 0;
defaultConfigurationName = Release;
};
2EA02D371D78A64800FEB930 /* Build configuration list for PBXNativeTarget "DragGestureRecognizerUITests" */ = {
isa = XCConfigurationList;
@ -521,6 +527,7 @@
2EA02D391D78A64800FEB930 /* Release */,
);
defaultConfigurationIsVisible = 0;
defaultConfigurationName = Release;
};
/* End XCConfigurationList section */
};

70
DragGestureRecognizer/DragGestureRecognizer.swift Normal file
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@ -0,0 +1,70 @@
//
// DragGestureRecognizer.swift
// DragGestureRecognizer
//
// Created by Wojciech Nagrodzki on 01/09/16.
// Copyright © 2016 Wojciech Nagrodzki. All rights reserved.
//
import UIKit
import UIKit.UIGestureRecognizerSubclass
/// `DragGestureRecognizer` is a subclass of `UILongPressGestureRecognizer` that allows for tracking translation similarly to `UIPanGestureRecognizer`.
class DragGestureRecognizer: UILongPressGestureRecognizer {
/// The total translation of the drag gesture in the coordinate system of the specified view.
/// - parameters:
/// - view: The view in whose coordinate system the translation of the drag gesture should be computed. Pass `nil` to indicate window.
func translation(in view: UIView?) -> CGPoint {
// not attached to a view or outside window
guard let window = self.view?.window else { return CGPoint() }
// gesture not in progress
guard let initialTouchLocationInWindow = initialTouchLocationInWindow else { return CGPoint() }
let inView = view ?? window
let initialLocation = initialTouchLocationsInViews[inView] ?? window.convert(initialTouchLocationInWindow, to: inView)
let currentLocation = location(in: inView)
return CGPoint(x: currentLocation.x - initialLocation.x, y: currentLocation.y - initialLocation.y)
}
/// Sets the translation value in the coordinate system of the specified view.
/// - parameters:
/// - translation: A point that identifies the new translation value.
/// - view: A view in whose coordinate system the translation is to occur. Pass `nil` to indicate window.
func setTranslation(_ translation: CGPoint, in view: UIView?) {
// not attached to a view or outside window
guard let window = self.view?.window else { return }
// gesture not in progress
guard let _ = initialTouchLocationInWindow else { return }
let inView = view ?? window
let currentLocation = location(in: inView)
let initialLocation = CGPoint(x: currentLocation.x - translation.x, y: currentLocation.y - translation.y)
initialTouchLocationsInViews[inView] = initialLocation
}
override var state: UIGestureRecognizerState {
didSet {
switch state {
case .began:
initialTouchLocationInWindow = location(in: nil)
case .ended, .cancelled, .failed:
initialTouchLocationInWindow = nil
initialTouchLocationsInViews = [:]
case .possible, .changed:
break
}
}
}
private var initialTouchLocationInWindow: CGPoint?
private var initialTouchLocationsInViews = [UIView: CGPoint]()
}