变更记录

方案名称

手势 - 实现手势操作介绍

关键字

手势 \ Gesture Recognizer \ 手势操作

需求场景

1. 需要对页面增加手势操作响应时

参考链接

1. Apple documentation
2. iOS手势识别的详细使用：拖动、缩放、旋转、点击、手势依赖、自定义手势
3. UIGestureRecognizer Tutorial in iOS 5: Pinches, Pans, and More!

详细内容

SDK 提供的手势

自定义手势举例

定义 TickleGestureRecognizer

1. TickleGestureRecognizer.h ```objective-c

   import

typedef enum { DirectionUnknown = 0, DirectionLeft, DirectionRight } Direction;

@interface TickleGestureRecognizer : UIGestureRecognizer

@property (assign) int tickleCount; @property (assign) CGPoint curTickleStart; @property (assign) Direction lastDirection;

@end

2. TickleGestureRecognizer.m
```objective-c
#import "TickleGestureRecognizer.h"
#import <UIKit/UIGestureRecognizerSubclass.h>

#define REQUIRED_TICKLES        2
#define MOVE_AMT_PER_TICKLE     25

@implementation TickleGestureRecognizer
@synthesize tickleCount;
@synthesize curTickleStart;
@synthesize lastDirection;

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch * touch = [touches anyObject];
    self.curTickleStart = [touch locationInView:self.view];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

    // Make sure we've moved a minimum amount since curTickleStart
    UITouch * touch = [touches anyObject];
    CGPoint ticklePoint = [touch locationInView:self.view];
    CGFloat moveAmt = ticklePoint.x - curTickleStart.x;
    Direction curDirection;
    if (moveAmt < 0) {
        curDirection = DirectionLeft;
    } else {
        curDirection = DirectionRight;
    }
    if (ABS(moveAmt) < MOVE_AMT_PER_TICKLE) return;

    // Make sure we've switched directions
    if (self.lastDirection == DirectionUnknown ||
        (self.lastDirection == DirectionLeft && curDirection == DirectionRight) ||
        (self.lastDirection == DirectionRight && curDirection == DirectionLeft)) {

        // w00t we've got a tickle!
        self.tickleCount++;
        self.curTickleStart = ticklePoint;
        self.lastDirection = curDirection;

        // Once we have the required number of tickles, switch the state to ended.
        // As a result of doing this, the callback will be called.
        if (self.state == UIGestureRecognizerStatePossible && self.tickleCount > REQUIRED_TICKLES) {
            [self setState:UIGestureRecognizerStateEnded];
        }
    }

}

- (void)resetState {
    self.tickleCount = 0;
    self.curTickleStart = CGPointZero;
    self.lastDirection = DirectionUnknown;
    if (self.state == UIGestureRecognizerStatePossible) {
        [self setState:UIGestureRecognizerStateFailed];
    }
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self resetState];
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self resetState];
}

@end

使用 TickleGestureRecognizer

1. ViewController.h ```objective-c // Add to top of file

   import "TickleGestureRecognizer.h"

// Add after @interface @property (strong) AVAudioPlayer * hehePlayer;

• (void)handleTickle:(TickleGestureRecognizer *)recognizer; ```

• ViewController.m ```objective-c // After @implementation @synthesize hehePlayer;

// In viewDidLoad, right after TODO TickleGestureRecognizer * recognizer2 = [[TickleGestureRecognizer alloc] initWithTarget:self action:@selector(handleTickle:)]; recognizer2.delegate = self; [view addGestureRecognizer:recognizer2];

// At end of viewDidLoad self.hehePlayer = [self loadWav:@"hehehe1"];

// Add at beginning of handlePan (gotta turn off pan to recognize tickles) return;

// At end of file

• (void)handleTickle:(TickleGestureRecognizer *)recognizer { [self.hehePlayer play]; } ```

效果图

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备注

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