ios - 移动图像后如何固定图像的位置？

Question

我正在使用 - (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 移动图像。如何在移动图像后固定它的位置。我的意思是我会就像当我选择正确的位置时，图像应该不再移动。

Answer 1

将 PanGesture 添加到包含图像的 imageView。

UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panDetected:)];
[imageView addGestureRecognizer:panRecognizer];
//method to move imageView whereever you want in the view,you can also write conditions to restrict the imageView not to go beyond bounds.
- (void)panDetected:(UIPanGestureRecognizer *)panRecognizer
{
    CGPoint translation = [panRecognizer translationInView:self.view];
    CGPoint imageViewPosition = imageView.center;
    imageViewPosition.x += translation.x;
    imageViewPosition.y += translation.y;


    imageView.center = imageViewPosition;

    [panRecognizer setTranslation:CGPointZero inView:self.view];

//you can use if(panRecognizer.state==UIGestureRecognizerStateEnded){} condition to fix the position of the imageView.
}