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2014年7月23日 星期三

iOS 開發筆記 - 使用 UITapGestureRecognizer / UISwipeGestureRecognizer 偵測 UIView Click/Tap/Swipe Event (手指點擊、滑動事件)

沒把玩過,趁颱風天筆記一下 :P

One Click (Single Tap):

- (void)viewDidLoad {
[super viewDidLoad];
UITapGestureRecognizer *tapGestureRecognizer;
tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTap:)];
tapGestureRecognizer.numberOfTapsRequired = 1;
[self.view addGestureRecognizer:tapGestureRecognizer];
}

- (void)singleTap:(UIGestureRecognizer *)recognizer {
NSLog(@"singleTap: %@", NSStringFromCGPoint([recognizer locationInView:[recognizer.view superview]]));
}


Double Click (Double Tap):

- (void)viewDidLoad {
[super viewDidLoad];
UITapGestureRecognizer *tapGestureRecognizer;
tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTap:)];
tapGestureRecognizer.numberOfTapsRequired = 2;
[self.view addGestureRecognizer:tapGestureRecognizer];
}

- (void)doubleTap:(UIGestureRecognizer *)recognizer {
NSLog(@"doubleTap: %@", NSStringFromCGPoint([recognizer locationInView:[recognizer.view superview]]));
}


Swipe Up:

- (void)viewDidLoad {
[super viewDidLoad];
UISwipeGestureRecognizer *swipeGestureRecognizer;
swipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeUp:)];
swipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionUp;
[self.view addGestureRecognizer:swipeGestureRecognizer];
}

- (void)swipeUp:(UIGestureRecognizer *)recognizer {
NSLog(@"swipeUp: %@", NSStringFromCGPoint([recognizer locationInView:[recognizer.view superview]]));
}


Swipe Down:

- (void)viewDidLoad {
[super viewDidLoad];
UISwipeGestureRecognizer *swipeGestureRecognizer;
swipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeDown:)];
swipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionDown;
[self.view addGestureRecognizer:swipeGestureRecognizer];
}

- (void)swipeDown:(UIGestureRecognizer *)recognizer {
NSLog(@"swipeDown: %@", NSStringFromCGPoint([recognizer locationInView:[recognizer.view superview]]));
}


Swipe Left:

- (void)viewDidLoad {
[super viewDidLoad];
UISwipeGestureRecognizer *swipeGestureRecognizer;
swipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeLeft:)];
swipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:swipeGestureRecognizer];
}

- (void)swipeLeft:(UIGestureRecognizer *)recognizer {
NSLog(@"swipeLeft: %@", NSStringFromCGPoint([recognizer locationInView:[recognizer.view superview]]));
}


Swipe Right:

- (void)viewDidLoad {
[super viewDidLoad];
UISwipeGestureRecognizer *swipeGestureRecognizer;
swipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRight:)];
swipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:swipeGestureRecognizer];
}

- (void)swipeRight:(UIGestureRecognizer *)recognizer {
NSLog(@"swipeRight: %@", NSStringFromCGPoint([recognizer locationInView:[recognizer.view superview]]));
}


其他部分,大概是注意 UIView 跟 UIViewController 內定已經有把 events 接收處理的事項,例如 UIScrollView 就有捲動事件,假設 UIScrollView 只有提供左右捲動的功能,那就偵測不到 SwipeLeft 跟 SwipeRight ,但 SwipeUp 跟 SwipeDown 仍可以。而 Single Tap 跟 Double Tap 之間,基本上兩者存在時,點擊兩下的過程中,Single Tap Action 跟 Double Tap Action 都會被執行,並且 Single Tap Action 會先被執行。

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