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下面創建一個手勢識別是移動整個視圖:對整個視圖使用UIPanGestureRecognizer移動子視圖
UIPanGestureRecognizer * recognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
recognizer.delegate = self;
[self.view addGestureRecognizer:recognizer];
- (IBAction)handlePan:(UIPanGestureRecognizer *)recognizer {
CGPoint translation = [recognizer translationInView:self.view];
recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x,
recognizer.view.center.y + translation.y);
[recognizer setTranslation:CGPointMake(0, 0) inView:self.view];
}
但我只想移動子視圖之一。我不能這樣做:
[self.theSubview addGestureRecognizer:recognizer];
因爲我想識別整個屏幕上的手勢。應該移動的對象可能很小,我不想強制用戶「抓」它。我如何修改處理器方法來移動子視圖?