製作一個滑動按鈕

Question

我想製作一個滑動按鈕，因此當用戶從右向左滑動按鈕時，按鈕也會從右向左繪製，最後它會推動另一個視圖，任何人都可以提供示例代碼它。

Answer 1

// make button 

UIButton*btn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
[btn setFrame:CGRectMake(50, 50, 50, 50)]; 
[btn addTarget:self action:@selector(wasDragged:withEvent:) 
       forControlEvents:UIControlEventTouchDragInside]; 
[self.view addSubview:btn]; 


// here swipe buttons 


- (void)wasDragged:(UIButton *)button withEvent:(UIEvent *)event 
{ 
    // get the touch 
    UITouch *touch = [[event touchesForView:button] anyObject]; 

    // get delta 
    CGPoint previousLocation = [touch previousLocationInView:button]; 
    CGPoint location = [touch locationInView:button]; 
    CGFloat delta_x = location.x - previousLocation.x; 
    CGFloat delta_y = location.y - previousLocation.y; 

    // move button 
    CGPoint moveBtnCenter = CGPointMake(button.center.x + delta_x, 
             button.center.y + delta_y); 
    button.center = moveBtnCenter; 

    NSArray* allSubViews = [self.view subviews]; 
    for (UIView*subView in allSubViews) 
    { 
     if ([subView isKindOfClass:[UIButton class]]) 
     { 
      CGPoint subViewCenter = subView.center; 
      if (CGPointEqualToPoint(moveBtnCenter, subViewCenter)) 
      { 
       subView.center = previousLocation; 
      } 
     } 
    } 
}