"iOS 官方文档1：事件处理指南及手势检测"

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The Event Handling Guide for iOS provides comprehensive information on how to handle events in iOS applications. The guide covers various aspects of event handling, including gestures, touch events, motion events, and remote control events. It emphasizes the ease with which UIKit allows developers to detect and handle different types of events in their applications. The guide starts by providing an overview of events in iOS and the role of UIKit in simplifying event detection for developers. It explains how an event travels along a specific path in search of an object to handle it, and introduces the concept of UIEvent, which encapsulates touch, shake-motion, and remote control events. The guide also outlines how multitouch events are received when users interact with the app's views, motion events are received when users move their devices, and remote control events are received when users manipulate multimedia controls. To make the most of the Event Handling Guide for iOS, developers should have a basic understanding of iOS development and the UIKit framework. The guide also provides references to related documentation and resources for further information. In summary, the Event Handling Guide for iOS is a comprehensive resource for iOS developers looking to understand and implement event handling in their applications. It covers a wide range of topics related to event detection and provides practical guidance on leveraging the capabilities of UIKit for effective event handling. By following the recommendations and examples provided in the guide, developers can enhance the user experience of their iOS applications through responsive and intuitive event handling.

Using Interface Builder to Add a Gesture Recognizer to Your App

Within Interface Builder in Xcode, add a gesture recognizer to your app the same way you add any object to

your user interface—drag the gesture recognizer from the object library to a view. When you do this, the gesture

recognizer automatically becomes attached to that view. You can check which view your gesture recognizer

is attached to, and if necessary, change the connection in the nib file.

After you create the gesture recognizer object, you need to create and connect an action method. This method

is called whenever the connected gesture recognizer recognizes its gesture. If you need to reference the gesture

recognizer outside of this action method, you should also create and connect an outlet for the gesture recognizer.

Your code should look similar to Listing 1-1.

Listing 1-1 Adding a gesture recognizer to your app with Interface Builder

@interface APLGestureRecognizerViewController ()

@property (nonatomic, strong) IBOutlet UITapGestureRecognizer *tapRecognizer;

@end

@implementation

- (IBAction)displayGestureForTapRecognizer:(UITapGestureRecognizer *)recognizer

// Will implement method later...

}

@end

Adding a Gesture Recognizer Programmatically

You can create a gesture recognizer programmatically by allocating and initializing an instance of a concrete

UIGestureRecognizer subclass, such as UIPinchGestureRecognizer. When you initialize the gesture

recognizer, specify a target object and an action selector, as in Listing 1-2. Often, the target object is the view’s

view controller.

If you create a gesture recognizer programmatically, you need to attach it to a view using the

addGestureRecognizer: method. Listing 1-2 creates a single tap gesture recognizer, specifies that one tap

is required for the gesture to be recognized, and then attaches the gesture recognizer object to a view. Typically,

you create a gesture recognizer in your view controller’s viewDidLoad method, as shown in Listing 1-2.

Listing 1-2 Creating a single tap gesture recognizer programmatically

- (void)viewDidLoad {

[super viewDidLoad];

Gesture Recognizers

Responding to Events with Gesture Recognizers

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"iOS 官方文档1：事件处理指南及手势检测"

Event Handling Guide for iOS

Event Handling Guide for iOS 中文翻译版1

iOS 10 App Development Essentials

[Vue warn]: Invalid event arguments: event validation failed for event "click".

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