iphone - 拖回同一位置

Question

我在我的应用程序中使用拖动选项，因为我想将对象设置在相同的位置，即在拖动回相同的位置后，我尝试使用以下编码将它设置为其他位置，我应该在此进行哪些更改，

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint touchPoint = [[touches anyObject] locationInView:self.view];
if (touchPoint.x > self.img1.frame.origin.x &&
    touchPoint.x < self.img1.frame.origin.x + self.img1.frame.size.width &&
    touchPoint.y > self.img1.frame.origin.y &&
    touchPoint.y < self.img1.frame.origin.y + self.img1.frame.size.height )
{
    self.img1.backgroundColor = self.img1.backgroundColor;

}
self.img1.frame = CGRectMake(self.homePosition.x, self.homePosition.y,
                                   self.img1.frame.size.width,
                                   self.img1.frame.size.height);
}

Answer 1

在.h

CGPoint startPt;

在.m

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    startPt = [[touches anyObject] locationInView:self.view];

}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint touchPoint = [[touches anyObject] locationInView:self.view];
if (touchPoint.x > self.img1.frame.origin.x &&
    touchPoint.x < self.img1.frame.origin.x + self.img1.frame.size.width &&
    touchPoint.y > self.img1.frame.origin.y &&
    touchPoint.y < self.img1.frame.origin.y + self.img1.frame.size.height )
{
    self.img1.backgroundColor = self.img1.backgroundColor;

}
self.img1.frame = CGRectMake(startPt.x, startPt.y,
                                   self.img1.frame.size.width,
                                   self.img1.frame.size.height);
}