Ios 平移手势识别器重置
我已经在我的按钮上添加了一个平移手势,当我在没有任何附加代码的情况下移动它时,一切都很好,但是当我添加一些代码时,按钮开始重置到其原始位置,下面的示例中对此进行了注释 为什么会这样?这是什么原因Ios 平移手势识别器重置,ios,reset,uipangesturerecognizer,Ios,Reset,Uipangesturerecognizer,我已经在我的按钮上添加了一个平移手势,当我在没有任何附加代码的情况下移动它时,一切都很好,但是当我添加一些代码时,按钮开始重置到其原始位置,下面的示例中对此进行了注释 为什么会这样?这是什么原因 - (IBAction)handlePan:(UIPanGestureRecognizer *)recognizer { switch([recognizer state]){ case UIGestureRecognizerStateBegan: { UIButton *bu
- (IBAction)handlePan:(UIPanGestureRecognizer *)recognizer {
switch([recognizer state]){
case UIGestureRecognizerStateBegan: {
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setFrame:recognizer.view.frame];
[button setBackgroundColor: [UIColor redColor]];
// [self.view insertSubview:button belowSubview:recognizer.view];
_tempButton = button;
}break;
case UIGestureRecognizerStateChanged: {
CGPoint translation = [recognizer translationInView:self.view];
recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, recognizer.view.center.y + translation.y);
[recognizer setTranslation:CGPointMake(0, 0) inView:self.view];
}break;
}
}
将您在UIGestureRecognitzerStateChanged案例中添加的代码移动到操作方法的标题中:
CGPoint translation = [recognizer translationInView:self.view];
recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x,
recognizer.view.center.y + translation.y);
[recognizer setTranslation:CGPointMake(0, 0) inView:self.view];
之后,您要做的另一件事是在切换方法中创建另一个案例:
//This checks if you ended the pan gesture (removed finger from object)
case UIGestureRecognizerStateEnded:
{
CGPoint velocity = [recognizer velocityInView:self.view];
CGFloat magnitude = sqrtf((velocity.x * velocity.x) + (velocity.y * velocity.y));
CGFloat slideMult = magnitude / 200;
NSLog(@"magnitude: %f, slideMult: %f", magnitude, slideMult);
float slideFactor = 0.1 * slideMult; // Increase for more of a slide
CGPoint finalPoint = CGPointMake(recognizer.view.center.x + (velocity.x * slideFactor),
recognizer.view.center.y + (velocity.y * slideFactor));
finalPoint.x = MIN(MAX(finalPoint.x, 0), self.view.bounds.size.width);
finalPoint.y = MIN(MAX(finalPoint.y, 0), self.view.bounds.size.height);
[UIView animateWithDuration:slideFactor*2 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
recognizer.view.center = finalPoint;
} completion:nil];
}
因此,我在上面的UIgestureRecognitzerStateEnded状态中所做的是,我选择了用户发送图像的最后一点。之后,我将图像的中心设置为图像最后一刻的点。因此,现在图像将不会返回到上一点,但它将保留在用户拍摄的位置