[英]Gesture recognizer and button actions
我有一個看起來像這樣的視圖層次結構:
UIView (A)
UIView > UIImageView
UIView > UIView (B)
UIView > UIView (B) > Rounded Rect Button
UIView > UIView (B) > UIImageView
UIView > UIView (B) > UILabel
我已將手勢識別器附加到我的 UIView (B) 上。 我面臨的問題是,我沒有對 UIView (B) 內的圓角矩形按鈕執行任何操作。 singleTap 手勢識別器捕獲/覆蓋按鈕的 Touch Up Inside 事件。
我怎樣才能讓它工作? 我認為響應者鏈層次結構將確保優先考慮按鈕觸摸事件,並且它會被觸發! 我錯過了什么?
這是一些相關的代碼:
#pragma mark -
#pragma mark View lifecycle (Gesture recognizer setup)
- (void)viewDidLoad {
[super viewDidLoad];
// double tap gesture recognizer
UITapGestureRecognizer *dtapGestureRecognize = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTapGestureRecognizer:)];
dtapGestureRecognize.delegate = self;
dtapGestureRecognize.numberOfTapsRequired = 2;
[self.viewB addGestureRecognizer:dtapGestureRecognize];
// single tap gesture recognizer
UITapGestureRecognizer *tapGestureRecognize = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapGestureRecognizer:)];
tapGestureRecognize.delegate = self;
tapGestureRecognize.numberOfTapsRequired = 1;
[tapGestureRecognize requireGestureRecognizerToFail:dtapGestureRecognize];
[self.viewB addGestureRecognizer:tapGestureRecognize];
// add gesture recodgnizer to the grid view to start the edit mode
UILongPressGestureRecognizer *pahGestureRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGestureRecognizerStateChanged:)];
pahGestureRecognizer.delegate = self;
pahGestureRecognizer.minimumPressDuration = 0.5;
[self.viewB addGestureRecognizer:pahGestureRecognizer];
[dtapGestureRecognize release];
[tapGestureRecognize release];
[pahGestureRecognizer release];
}
#pragma mark -
#pragma mark Button actions
- (IBAction)buttonTouchUpInside:(id)sender {
NSLog(@"%s, %@", __FUNCTION__, sender);
}
#pragma mark -
#pragma mark Gesture recognizer actions
- (void)singleTapGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer {
NSLog(@"%s", __FUNCTION__);
}
- (void)doubleTapGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer {
NSLog(@"%s", __FUNCTION__);
}
- (void)longPressGestureRecognizerStateChanged:(UIGestureRecognizer *)gestureRecognizer {
switch (gestureRecognizer.state) {
case UIGestureRecognizerStateEnded: {
NSLog(@"%s", __FUNCTION__);
break;
}
default:
break;
}
}
在“shouldReceiveTouch”方法中,您應該添加一個條件,如果觸摸位於按鈕中,則該條件將返回 NO。
這是來自蘋果SimpleGestureRecognizers 的例子。
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
// Disallow recognition of tap gestures in the segmented control.
if ((touch.view == yourButton)) {//change it to your condition
return NO;
}
return YES;
}
希望它會有所幫助
編輯
正如丹尼爾指出的那樣,您必須符合UIGestureRecognizerDelegate
才能使其工作。
沙尼
我也有同樣的問題,然后我嘗試
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
if ([touch.view isKindOfClass:[UIButton class]]) { //change it to your condition
return NO;
}
return YES;
}
它現在完美地工作.......
一般來說,我們使用下面的委托方法來避免各種 UIControl 中的觸摸:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
if (([touch.view isKindOfClass:[UIControl class]])) {
return NO;
}
return YES;
}
注意:不要做這個檢查(檢查recognizer.view 類類型)gestureRecognizerShouldBegin,它不會工作。
這是一個Swift 3.0版本:
extension UIViewController: UIGestureRecognizerDelegate {
public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
if touch.view is UIButton {
return false
}
return true
}
不要忘記:
Make your tapper object delegate to self (eg: tapper.delegate = self)
這是一個 Swift 版本:
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
if (touch.view!.isKindOfClass(UIButton)) {
return false
}
return true
}
不要忘記:
UIGestureRecognizerDelegate
tapper.delegate = self
)我認為最好的解決方案是使用下面的代碼片段:
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
CGPoint touchLocation = [touch locationInView:self.view];
return !CGRectContainsPoint(self.menuButton.frame, touchLocation);
}
Vivienne 的 Swift 版本回答:
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
let location = touch.location(in: view)
return !someView.frame.contains(location)
}
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