Will的部落格

swipe手勢指一根或多跟手指在螢幕上往某個方塊快速移動，

並可利用direction設定移動方向，

numberOfTouchedRequired屬性設定多少跟手指，

一個swipe手勢只能處理一個方向，需要處理兩個或兩個以上，

得再新增swipe手勢元件，以上為用storyboard的方法，

以下範例可在螢幕上滑動手勢並透過NSLog顯示手指滑動方向，

p.s 此範例因有四個方向，所以要拖入handleSwipe四個元件並設定方向屬性

 //viewcontroller.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(IBAction)handleSwipe:(UISwipeGestureRecognizer *)sender
{
    switch (sender.direction) {
        case UISwipeGestureRecognizerDirectionRight:
            NSLog(@"right");
            break;
        case UISwipeGestureRecognizerDirectionLeft:
            NSLog(@"lefe");
            break;
        case UISwipeGestureRecognizerDirectionUp:
            NSLog(@"up");
            break;
        case UISwipeGestureRecognizerDirectionDown:
            NSLog(@"down");
            break;
            
        default:
            break;
    }
}
@end

若要用code流派控制swipe以下為範例程式碼 

UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(functionName:)];
    UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(functionName:)];
    UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(functionName:)];
    UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(functionName:)];

    [swipeRight setDirection:UISwipeGestureRecognizerDirectionRight];
    [swipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
    [swipeUp setDirection:UISwipeGestureRecognizerDirectionUp];
    [swipeDown setDirection:UISwipeGestureRecognizerDirectionDown];

    [swipeLeft setNumberOfTouchesRequired:1];
    [swipeRight setNumberOfTouchesRequired:1];
    [swipeUp setNumberOfTouchesRequired:1];
    [swipeDown setNumberOfTouchesRequired:1];

    [self.view addGestureRecognizer:swipeLeft];
    [self.view addGestureRecognizer:swipeUp];
    [self.view addGestureRecognizer:swipeDown];
    [self.view addGestureRecognizer:swipeRight];

最後紀錄多個手勢產生碰撞的處理方式  

[pan requireGestureRecognizerToFail:swipeRight]; //swipeRight發生fail，就回頭觸發pan
[pan requireGestureRecognizerToFail:swipeLeft];