iOS iPhone中的可拖动按钮，以便在触摸结束后将其自身重新放置在其原始位置。 [英] Drag-able button in iOS iPhone such that it repositions itself in its orignal position after touch ended.

问题描述

我正在制作一个应用程序，其中有用于不同颜色的不同按钮，如果我在特定视图上拖动该颜色按钮，则其颜色必须更改为该按钮的颜色，并且该颜色按钮应重新放置在其原始位置。我尝试了各种方法，例如开始触摸和结束触摸，但这似乎无法解决我的问题。我还尝试了可在各种uicontrolstate上触发的自定义方法，但它也无法正常工作。请帮我解决这个问题。

I am making an app where there are different buttons for different colors, if i drag this color button on a specific view its color must change to this button's color and the color button should reposition in its orignal location. I tried various methods like touches began and touches ended but it doesn't seem to solve my issue. I also tried customized methods which fire on various uicontrolstate but it didnt work as well. plz help me out with this.

推荐答案

我认为您使用touchesBegan，touchesMoved和touchesEnded可以解决问题。

I think you use touchesBegan,touchesMoved and touchesEnded can solve the problem.

touchesBe开始标记orignPosition。

touchesBegan is to mark the orignPosition.

CGPoint orignPosition;
CGColor buttonColor;
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    UIView *touchView = [touch view];
        if ([touchView isKindOfClass:[UIButton class]]) 
        {
            orignPosition = (UIButton *)touchView.center;
            buttonColor = (UIButton *)touchView.backgroundColor;
        }
}

touchesMoved是用手指移动按钮

touchesMoved is to let the button move with your finger

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    UIView *touchView = [touch view];
    CGPoint movedPoint = [touch locationInView:yourMainView];
        CGPoint deltaVector = CGPointMake(movedPoint.x - lastTouchPoint.x, movedPoint.y - lastTouchPoint.y);
    lastTouchPoint = movedPoint;

    if ([touchView isKindOfClass:[UIButton class]])
        {
        touchView.center = CGPointMake(touchView.center.x + deltaVector.x, touchView.center.y + deltaVector.y);
        }
}

touchesEnded是判断是否更改您的特殊视图颜色

touchesEnded is to judge whether change your special view`s color

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{   
    UITouch *touch = [touches anyObject];
    UIView *touchView = [touch view];
        CGPoint movedPoint = [touch locationInView:scrollView];
        if ([touchView isKindOfClass:[UIButton class]]) 
        {
            [UIView beginAnimations:nil context:nil];
            [UIView setAnimationDuration:0.3];
            (UIButton *)touchView.center = orignPosition;
            [UIView commitAnimations];
        }
        if(CGRectContainsPoint(specialView.frame, [touch locationInView:yourMainView]))
        {
            [yourMainView setBackgroundColor:buttonColor];
        }
}

这篇关于iOS iPhone中的可拖动按钮，以便在触摸结束后将其自身重新放置在其原始位置。的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！