轉自：http://blog.163.com/china_uv/blog/static/117137267201252102612185/

UISwipeGestureRecognizer 左右事件相同為非注釋代碼， 左右事件不同為注釋代碼。

@implementation GestureRecognizerViewController

-(id)init
{
??? if (self == [super init]) {
????????
??????? UISwipeGestureRecognizer *recognizer;????
??????? recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];????
??????? [recognizer setDirection:UISwipeGestureRecognizerDirectionLeft|UISwipeGestureRecognizerDirectionRight];
??????? [[self view] addGestureRecognizer:recognizer];????
??????? [recognizer release];
????????
//??????? recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];????
//??????? [recognizer setDirection:UISwipeGestureRecognizerDirectionLeft];
//??????? [[self view] addGestureRecognizer:recognizer];????
//??????? [recognizer release];
//????????
//??????? recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];????
//??????? [recognizer setDirection:UISwipeGestureRecognizerDirectionRight];
//??????? [[self view] addGestureRecognizer:recognizer];????
//??????? [recognizer release];
????????
??? }
????
??? return self;
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
??? self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
??? if (self) {
??????? // Custom initialization
??? }
??? return self;
}

- (void)viewDidLoad
{
??? [super viewDidLoad];
????
??? self.view.backgroundColor = [UIColor darkGrayColor];
}

- (void)viewDidUnload
{
??? [super viewDidUnload];
??? // Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
??? return (interfaceOrientation == UIInterfaceOrientationPortrait);
}


-(void) dealloc
{
??? for (UISwipeGestureRecognizer *recognizer in [[self view] gestureRecognizers]) {??
??????? [[self view] removeGestureRecognizer:recognizer];??
??? }?
????
??? [super dealloc];
}

// ------------------------------------------------------------------------

- (void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer{????
????
??? NSLog(@"direction ------------- %d", recognizer.direction);
????
????
??? if (recognizer.direction == (UISwipeGestureRecognizerDirectionLeft | UISwipeGestureRecognizerDirectionRight)) {????
??????? NSLog(@"left & right");??
??? }
????
//??? if (UISwipeGestureRecognizerDirectionLeft == recognizer.direction) {????
//??????? NSLog(@"left");??
//??? }
//????
//??? if (UISwipeGestureRecognizerDirectionRight == recognizer.direction) {????
//??????? NSLog(@"right");??
//??? }
}


感嘆下IOS的智慧，UISwipeGestureRecognizerDirection定義用的是位移。
typedef enum {
??? UISwipeGestureRecognizerDirectionRight = 1 << 0,
??? UISwipeGestureRecognizerDirectionLeft? = 1 << 1,
??? UISwipeGestureRecognizerDirectionUp??? = 1 << 2,
??? UISwipeGestureRecognizerDirectionDown? = 1 << 3
} UISwipeGestureRecognizerDirection;

轉載于:https://www.cnblogs.com/wangpei/p/4260046.html

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