Question

i am trying to have a drop area of an item and when the item drops on the wrong area it will go back to its original position.

我的守则如下:

UITouch *touch =[[event allTouches] anyObject];
    CGPoint dropPoint = CGPointMake(60, 520);
    location = [touch locationInView:self.view];


if([touch view]==image1 && CGPointEqualToPoint(location, dropPoint)){
   [image1 setFrame:CGRectMake(60, 520, 150, 184)];
    return;
} else
{
    [dad setFrame:CGRectMake(530, 225, 150, 184)];
}

i 我认为,我的错误是,如果指挥指挥,在指挥之前必须确切地表明这一点,即点点上的位置是正确的吗?

现在我不知道如何确定......

事先得到帮助!

Answer 1

由于CGPoint使用CGFloats(这意味着该地点必须如此精确,我并不认为大多数用户能够这样做),我最好的猜测是,它会处理下点问题。一种解决办法是利用CGRect和比较使用:

CGRectContainsPoint(dropRect, location);

注:比较:

[touch view] == image1

如果两点人提到同一物体(只要你知道UITouches的眼光财产会归还原先的看法,那么现在的感觉就会出现。

Answer 2

This line

[touch view]==image1

compares the pointers not the objects to which they point. This may be your problem. An easy solution is to use the tag property for UIViews to keep track of which image is currently the view for touch.

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