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2013/06/18

[iOS] 滑動手勢 - UISwipeGestureRecognizer


我是UISwipeGestureRecognizer,我幫您辨識使用者滑動的手勢











第1步:建立一個名為"UISwipeGestureRecognizer"的"Single View Application"專案
 

第2步:拖拉一個UISwipeGestureRecognizer,以便辨識使用者滑動的事件。



第3步:處理UISwipeGestureRecognizer滑動後產生的事件,在此以UIAlertView簡單顯示一個被滑動的訊息。

  • 3.1 對UISwipeGestureRecognizer按鈕按右鍵打開選單,找到代表按鈕被按下的"selector"事件,並拖拉右方圓點至ViewController類別的定義中(.h)。



  • 3.2 於"Name"欄位中輸入"swipe",並按下"Connect"。


  • 3.3 此時會產生一個名為"swipe:"方法,其已與Interface Builder連結。


  • 3.4 打開"ViewController.m"檔案,並找到swipe:方法,透過UIAlertView顯示"抓到滑動事件了!"的字樣


- (IBAction)swipe:(id)sender { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"抓到滑動訊息了!" delegate:nil cancelButtonTitle:@"關閉" otherButtonTitles:nil, nil]; [alert show]; }



第4步:為底層的View加上滑動的手勢辨識能力。對View按右鍵,找到"gestureRecognizers",按住拖拉至UISwipeGestureRecognizer上。





第5步:執行,向右滑動觸發滑動事件






想要向上、向下或向左滑?! 沒問題,透過UISwipeGestureRecognizer上的"Swipe"屬性可以決定所要偵測的滑動方向,而"Touches"屬性則決定了要多少支手指同時滑動才觸發滑動事件。



官方手勢參考資料 Link




檔案連結:UISwipeGestureRecognizer.zip