手势识别器（UIGestureRecognizer）- UISwipeGestureRecognizer(轻扫)

//
//  ViewController.m


#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 给imageView添加手势
    self.imageView.userInteractionEnabled = YES;
    
    // 创建『轻扫』手势，默认方向是往右滑
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
    
    // 设置滑动的方向
    /*
     UISwipeGestureRecognizerDirectionRight
     UISwipeGestureRecognizerDirectionLeft
     UISwipeGestureRecognizerDirectionUp
     UISwipeGestureRecognizerDirectionDown
     */
    swipe.direction = UISwipeGestureRecognizerDirectionDown;
    
    [self.imageView addGestureRecognizer:swipe];
    
    
    // 注意点：如果想要一个控件支持多个方向的滑动，必须创建多个轻扫手势
    UISwipeGestureRecognizer *swipeUP = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
    swipe.direction = UISwipeGestureRecognizerDirectionUp;
    [self.imageView addGestureRecognizer:swipeUP];

}


- (void)swipe:(UISwipeGestureRecognizer *)recognizer
{
    NSLog(@"滑动啦");
}

@end