我正在檢測用戶是否已按下2秒鐘：UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)]; longPress.minimumPressDuration = 2.0; [self addGestureRecognizer:longPress]; [longPress release];這是我處理長按的方式：-(void)handleLongPress:(UILongPressGestureRecognizer*)recognizer{ NSLog(@"double oo");}當(dāng)我按下2秒鐘以上時，文本“ double oo”被打印兩次。為什么是這樣？我該如何解決？
3 回答
海綿寶寶撒
TA貢獻(xiàn)1809條經(jīng)驗 獲得超8個贊
UILongPressGestureRecognizer是連續(xù)事件識別器。您必須查看狀態(tài)以查看這是事件的開始，中間還是結(jié)束，并采取相應(yīng)的措施。即，您可以在開始之后放棄所有事件，或者僅根據(jù)需要查看運動。從 類參考：
長按手勢是連續(xù)的。當(dāng)在指定時間段內(nèi)（minimumPressDuration）按下了允許的手指數(shù)（numberOfTouchesRequired），并且觸摸沒有移動超出允許的移動范圍（allowableMovement）時，手勢即開始（UIGestureRecognizerStateBegan）。每當(dāng)手指移動時，手勢識別器都會轉(zhuǎn)換為“更改”狀態(tài)，并且在任何手指抬起時手勢識別器都會終止（UIGestureRecognizerStateEnded）。
現(xiàn)在您可以像這樣跟蹤狀態(tài)
- (void)handleLongPress:(UILongPressGestureRecognizer*)sender {
if (sender.state == UIGestureRecognizerStateEnded) {
NSLog(@"UIGestureRecognizerStateEnded");
//Do Whatever You want on End of Gesture
}
else if (sender.state == UIGestureRecognizerStateBegan){
NSLog(@"UIGestureRecognizerStateBegan.");
//Do Whatever You want on Began of Gesture
}
}
白板的微信
TA貢獻(xiàn)1883條經(jīng)驗 獲得超3個贊
要檢查UILongPressGestureRecognizer的狀態(tài)，只需在選擇器方法上添加if語句：
- (void)handleLongPress:(UILongPressGestureRecognizer *)sender {
if (sender.state == UIGestureRecognizerStateEnded) {
NSLog(@"Long press Ended");
} else if (sender.state == UIGestureRecognizerStateBegan) {
NSLog(@"Long press detected.");
}
}
達(dá)令說
TA貢獻(xiàn)1821條經(jīng)驗 獲得超6個贊
您需要檢查正確的狀態(tài)，因為每種狀態(tài)都有不同的行為。您最有可能需要UIGestureRecognizerStateBegan帶有狀態(tài)UILongPressGestureRecognizer。
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]
initWithTarget:self
action:@selector(handleLongPress:)];
longPress.minimumPressDuration = 1.0;
[myView addGestureRecognizer:longPress];
[longPress release];
...
- (void)handleLongPress:(UILongPressGestureRecognizer *)gesture {
if(UIGestureRecognizerStateBegan == gesture.state) {
// Called on start of gesture, do work here
}
if(UIGestureRecognizerStateChanged == gesture.state) {
// Do repeated work here (repeats continuously) while finger is down
}
if(UIGestureRecognizerStateEnded == gesture.state) {
// Do end work here when finger is lifted
}
}
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