Swipe to "like" or "dislike" any view, just like Tinder.app. Build a flashcard app, a photo viewer, and more, in minutes, not hours!
- Use
UIView+MDCSwipeToChooseto add a swipe gesture and callbacks to anyUIView. - Use
MDCSwipeToChooseViewto get a UI nearly identical to Tinder.app in just a few lines of code.
You may view slides on some the architecture decisions that went into this library here.
Place the following in your Podfile and run pod install:
pod "MDCSwipeToChoose"Check out the sample app for an example of how to use MDCSwipeToChooseView to build the UI in the GIF above.
NOTE: You must run
pod installin theExamples/LikedOrNopedirectory before building the example app.
Every public class contains documentation in its header file.
The following is an example of how you can use MDCSwipeToChooseView to display a photo. The user can choose to delete it by swiping left, or save it by swiping right.
#import <MDCSwipeToChoose/MDCSwipeToChoose.h>
// ... in a view controller
#pragma mark - Creating and Customizing a MDCSwipeToChooseView
- (void)viewDidLoad {
[super viewDidLoad];
// You can customize MDCSwipeToChooseView using MDCSwipeToChooseViewOptions.
MDCSwipeToChooseViewOptions *options = [MDCSwipeToChooseViewOptions new];
options.likedText = @"Keep";
options.likedColor = [UIColor blueColor];
options.nopeText = @"Delete";
options.onPan = ^(MDCPanState *state){
if (state.thresholdRatio == 1.f && state.direction == MDCSwipeDirectionLeft) {
NSLog(@"Let go now to delete the photo!");
}
};
MDCSwipeToChooseView *view = [[MDCSwipeToChooseView alloc] initWithFrame:self.view.bounds
options:options];
view.imageView.image = [UIImage imageNamed:@"photo"];
[self.view addSubview:view];
}
#pragma mark - MDCSwipeToChooseDelegate Callbacks
// This is called when a user didn't fully swipe left or right.
- (void)viewDidCancelSwipe:(UIView *)view {
NSLog(@"Couldn't decide, huh?");
}
// Sent before a choice is made. Cancel the choice by returning `NO`. Otherwise return `YES`.
- (BOOL)view:(UIView *)view shouldBeChosenWithDirection:(MDCSwipeDirection)direction {
if (direction == MDCSwipeDirectionLeft) {
return YES;
} else {
// Snap the view back and cancel the choice.
[UIView animateWithDuration:0.16 animations:^{
view.transform = CGAffineTransformIdentity;
view.center = [view superview].center;
}];
return NO;
}
}
// This is called then a user swipes the view fully left or right.
- (void)view:(UIView *)view wasChosenWithDirection:(MDCSwipeDirection)direction {
if (direction == MDCSwipeDirectionLeft) {
NSLog(@"Photo deleted!");
} else {
NSLog(@"Photo saved!");
}
}To use objective-c code from swift, you need to use bridging-header.
#ifndef BridgingHeader_h
#define BridgingHeader_h
#import <UIKit/UIKit.h>
#import <MDCSwipeToChoose/MDCSwipeToChoose.h>
#endif
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let options = MDCSwipeToChooseViewOptions()
options.delegate = self
options.likedText = "Keep"
options.likedColor = UIColor.blue
options.nopeText = "Delete"
options.nopeColor = UIColor.red
options.onPan = { state -> Void in
if state?.thresholdRatio == 1 && state?.direction == .left {
print("Photo deleted!")
}
}
let view = MDCSwipeToChooseView(frame: self.view.bounds, options: options)
view?.imageView.image = UIImage(named: "photo.png")
self.view.addSubview(view!)
}
}
extension ViewController: MDCSwipeToChooseDelegate {
// This is called when a user didn't fully swipe left or right.
func viewDidCancelSwipe(_ view: UIView) -> Void{
print("Couldn't decide, huh?")
}
// Sent before a choice is made. Cancel the choice by returning `false`. Otherwise return `true`.
func view(_ view: UIView, shouldBeChosenWith: MDCSwipeDirection) -> Bool {
if shouldBeChosenWith == .left {
return true
} else {
// Snap the view back and cancel the choice.
UIView.animate(withDuration: 0.16, animations: { () -> Void in
view.transform = CGAffineTransform.identity
view.center = view.superview!.center
})
return false
}
}
// This is called when a user swipes the view fully left or right.
func view(_ view: UIView, wasChosenWith: MDCSwipeDirection) -> Void {
if wasChosenWith == .left {
print("Photo deleted!")
} else {
print("Photo saved!")
}
}
}If you're using CocoaPods 0.36+ (perhaps because you want to include pods that contain Swift code) and you've included the use_frameworks! directive in your Podfile, then you've converted all your pods (including MDCSwipeToChoose) into frameworks. Therefore, you'll need to include the line
import MDCSwipeToChoose...in your Swift files (even if you're using a bridging header).
You don't have to use a subclass of MDCChooseView. You can use the mdc_swipeToChooseSetup: method on any UIView to enable swipe-to-choose.
In the following example, we adjust the opacity of a UIWebView when it's panned left and right.
#import <MDCSwipeToChoose/MDCSwipeToChoose.h>
// ... in a view controller
- (void)viewDidLoad {
[super viewDidLoad];
MDCSwipeOptions *options = [MDCSwipeOptions new];
options.delegate = self;
options.onPan = ^(MDCPanState *state){
switch (state.direction) {
case MDCSwipeDirectionLeft:
self.webView.alpha = 0.5f - state.thresholdRatio;
break;
case MDCSwipeDirectionRight:
self.webView.alpha = 0.5f + state.thresholdRatio;
break;
case MDCSwipeDirectionNone:
self.webView.alpha = 0.5f;
break;
}
};
[self.webView mdc_swipeToChooseSetup:options];
}##Swiping in Swift
The following is an example of how you can use MDCSwipeToChooseView to display a photo in swift. The user can choose to delete it by swiping left, or save it by swiping right.
First you must create a BridgingHeader.h file
#ifndef ProjectName_BridgingHeader_h
#define ProjectName_BridgingHeader_h
#import <UIKit/UIKit.h>
#import <MDCSwipeToChoose/MDCSwipeToChoose.h>
#endifYou must then add the bridging header file to the project by navigating to Build Settings then searching for 'Bridging Header'. Double click the field and type: ProjectName/BridgingHeader.h as the value
// Creating and Customizing a MDCSwipeToChooseView
override func viewDidLoad(){
super.viewDidLoad()
// You can customize MDCSwipeToChooseView using MDCSwipeToChooseViewOptions.
let options:MDCSwipeToChooseViewOptions = MDCSwipeToChooseViewOptions()
options.delegate = self
options.likedText = "Keep"
options.likedColor = UIColor.blue
options.nopeText = "Delete"
options.nopeColor = UIColor.red
options.onPan = { state -> Void in
if (state?.thresholdRatio == 1.0 && state?.direction == .left) {
print("Let go now to delete the photo!")
}
}
let view:MDCSwipeToChooseView = MDCSwipeToChooseView(frame:self.view.bounds, options:options)
view.imageView.image = UIImage(named:"photo")
self.view.addSubview(view)
}
// MDCSwipeToChooseDelegate Callbacks
// This is called when a user didn't fully swipe left or right.
func viewDidCancelSwipe(_ view: UIView) -> Void {
print("Couldn't decide, huh?")
}
// Sent before a choice is made. Cancel the choice by returning `false`. Otherwise return `true`.
func view(_ view:UIView, shouldBeChosenWith: MDCSwipeDirection) -> Bool {
if (shouldBeChosenWith == .left) {
return true
} else {
// Snap the view back and cancel the choice.
UIView.animate(withDuration: 0.16, animations: { () -> Void in
view.transform = CGAffineTransform.identity
view.center = self.view.center
})
return false
}
}
// This is called when a user swipes the view fully left or right.
func view(_ view: UIView, wasChosenWith: MDCSwipeDirection) -> Void{
if (wasChosenWith == .left) {
print("Photo deleted!")
} else {
print("Photo saved!")
}
}As of version 0.2.0, you may also swipe a view programmatically:
self.swipeToChooseView(mdc_swipe:MDCSwipeDirection.Left)
[self.swipeToChooseView mdc_swipe:MDCSwipeDirectionLeft];self.swipeToChooseView.mdc_swipe(.left)You may also disable the swiping gesture and only allowed to swipe programmatically
MDCSwipeToChooseViewOptions *options = [MDCSwipeToChooseViewOptions new];
options.swipeEnabled = NO;let options = MDCSwipeToChooseViewOptions()
options.swipeEnabled = falseAll the source code is distributed under the MIT license. See the LICENSE file for details. The license does not apply to the images used in the sample apps.
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