我們都知道UIGestureRecognizer只支援iOS3.2以上的環境
但是讀過
Jesse的文章之後,我覺得我可以很放心的去使用這個API
網路上也很多這類的文章,詳細的原理可以參考
官方文件
我僅針對我實作過程中所遇到的問題 貼上一些個人的解法跟筆記
在一陣copy paste過後,程式編譯似乎沒什麼問題,可是就是手勢沒反應
1
| [self.imageView addGestureRecognizer:tapGestureRecognize];
|
因為人家的事件是發生在UIView上面…不是UIimageView
2. 那不指定self.view可以換成別的subview嗎?
當然可以阿,在接收到gesture時filter掉我們不接受的view或是特定範圍,
使用下面這個event function
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| - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
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3. 喂～沒反應阿! gestureRecognizer: shouldReceiveTouch: 根本就沒有觸發進來阿
喔～我想您跟我的煩惱是一樣滴,因為沒花一些時間k文件才會出現觀念上的問題
UIGestureRecogizer根本就沒有委託來處理這樣的event,當然會遲遲等不到event的發生阿
所以呢？
所以開始貼一些code吧
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| //.h
@interface showDigitNumberController : UIViewController
//.m
// Create the Swipe Gesture Recognizer
UISwipeGestureRecognizer *SwipeRecognizer = nil;
SwipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self
action:@selector(mySwipeGestureRecognizer:)];
[SwipeRecognizer setDirection:(UISwipeGestureRecognizerDirectionUp)];
[self.view addGestureRecognizer:SwipeRecognizer];
// assign the delegate here
SwipeRecognizer.delegate = self;
[SwipeRecognizer release];
SwipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self
action:@selector(mySwipeGestureRecognizer:)];
[SwipeRecognizer setDirection:(UISwipeGestureRecognizerDirectionDown)];
[self.view addGestureRecognizer:SwipeRecognizer];
[SwipeRecognizer release];
// Create Single Tap Gesture Recognizer
UITapGestureRecognizer *tapGestureRecognize = [[UITapGestureRecognizer alloc] initWithTarget:self
action:@selector(myTapGestureRecognizer:)];
tapGestureRecognize.numberOfTapsRequired = 1;
[self.view addGestureRecognizer:tapGestureRecognize];
[tapGestureRecognize release];
- (void)mySwipeGestureRecognizer:(UISwipeGestureRecognizer *)Sender {
switch(Sender.direction){
case UISwipeGestureRecognizerDirectionUp:
// do something
break;
case UISwipeGestureRecognizerDirectionDown:
// do something
break;
case UISwipeGestureRecognizerDirectionLeft:
// do something
break;
case UISwipeGestureRecognizerDirectionRight:
// do something
break;
default:
break;
}
}
- (void)myTapGestureRecognizer:(UITapGestureRecognizer *)Sender{
// do something
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldReceiveTouch:(UITouch *)touch {
}
|
4. 誠如先前所講的,若是要讓指定的subview接受gesture的event就是在這個function裡實作
網路上所提到的作法也是百百種
//有將superview給filter掉的作法
//UIView *gview; //This is the superview containing the buttons
//if([gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]])
// return !([touch.view isKindOfClass:[UIButton class]] && [touch.view
//isDescendentOfView:gview]);
//也有使用touch.view == menu1Btn || touch.view == menu2Btn …龐大if判斷式的作法
//http://stackoverflow.com/questions/4556944/a-tips-for-testing-existence-of-subviews
//就連官方sample code的作法也是if判斷的作法
//if ((touch.view == segmentedControl) && (gestureRecognizer == tapRecognizer)) {
// return NO;
//}
//return YES;
我的作法也是把不想接受到的gesture event的物件給填進去,不過沒有預期的效果
那到底怎麼偵測一個subview的手勢呢?
a. 首先我在
xib裡面view底下又多加了一個UIView, 並且指定我要的範圍大小
b. 在.h及.m裡將這個UIView的getter setter設定好,並確定xib的link有拉好
c. 在原先指定
addGestureRecognizer的view換成custom的這個就好了耶
