觸摸事件-拖動view

2019-11-14 19:38:05

字體：大中小

來源：轉載

供稿：網友

案例：通過觸摸事件拖動imageView和view1和view2

注意：1.imgeview默認不能響應觸摸事件，2.視圖有三個子視圖，如何區分多個視圖

用storyBoard托人2個view和一個imageView，IBOutlet連線

案例圖片：

//讓imageView接受用戶觸摸

1 [self.imageView setUserInteractionEnabled:YES];

區分哪個視圖

1 [touch view] == self.imageView

觸摸事件代碼

 1 -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 2 { 3     //1.獲取用戶點擊 4     UITouch *touch = [touches anyObject]; 5     CGPoint location = [touch locationInView:self.view]; 6     CGPoint PReLocation = [touch previousLocationInView:self.view]; 7     CGPoint dertPoint = CGPointMake(location.x - preLocation.x, location.y - preLocation.y); 8     //2.判斷點擊了那個視圖 9     if ([touch view] == self.imageView) {10         NSLog(@"點擊了圖像");11         12         [self.imageView setCenter:CGPointMake(self.imageView.center.x + dertPoint.x, self.imageView.center.y + dertPoint.y)];13     }else if ([touch view] == self.redView){14         NSLog(@"點擊了 hongse");15         [self.redView setCenter:CGPointMake(self.redView.center.x + dertPoint.x, self.redView.center.y + dertPoint.y)];16         17     }else if ([touch view] == self.greenView){18         //提示最好不要直接用else處理，因為隨時有可能添加新的控件19         NSLog(@"點擊 green");20         [self.greenView setCenter:CGPointMake(self.greenView.center.x + dertPoint.x, self.greenView.center.y + dertPoint.y)];21     }22     23 }