iPhone上可以拖动的按钮网格

我创建了一个简单的应用程序,可以满足你的需要。您可以在以下位置找到来源:

http://github.com/st3fan/iphone-experiments/tree/master/Miscellaneous/ColorPalette/

它只是一个容器视图( PaletteView 收到一个触摸,它找到触摸下的视图,然后告诉它的代理( PaletteViewDelegate

在4.0.2版本的iphone4上测试。

您可以使用touchesbeated+touchemoved+touchesend方法创建用户从头到尾触摸的按钮列表。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{
    // interactions is the NSMutableArray where you store the pressed/dragged buttons
    // we need to clear it when we start a new checkForInteractions
    [interactions removeAllObjects];

    UITouch *touch = [touches anyObject];
    [self checkForInteractions:touch];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    [self checkForInteractions:touch];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    [self checkForInteractions:touch];
    // here you'd call a function that'd use the buttons on the array,
    // to do whatever you wanted with them
    // it can also be copied to touchesMoved, to trigger the interactions
    // as the user's finger is moving, rather than only when it stops
    [self useInteractions];
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event 
{
    // if the touch was cancelled, clear the interactions
    [interactions removeAllObjects];
}
- (void) checkForInteractions : (UITouch *) touch
{
    if ([touch view] == myButton1 || [touch view] == myButton2)
    {
        // check if the object had already been added to the array
        if ( ![interactions containsObject:[touch view]] )
        {
            [interactions addObject:[touch view]];
        }
    }
}

我希望这有帮助:)

我想你可能会有点运气 UIGestureRecognizer