将图像从滚动视图拖动到视图而不会影响其位置

Posted 2021-04-21

如何确保滚动条中的图像能够从滚动条拖动到imageview？

我也想实现一个'摆动'。当用户在滚动条内轻击图像时，图像摆动并跟随用户的触摸到另一视图。我开始制作子视图，但是当图像在普通视图上显示时，它的位置会变为视图顶部而不是底部。

当我触摸图像时，如何确保：

• 图像摆动着
• 图像进入另一个视图。
• 图像跟随我的触摸位置

---

(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:self.view];

    image1.userInteractionEnabled = YES;
    [self.view addSubview:image1];

    if([touch view] == image1){

        image1.center = location;
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:0.14];
        [UIView setAnimationRepeatAutoreverses:YES];
        [UIView setAnimationRepeatCount:1000000];

        image1.transform = CGAffineTransformMakeRotation(69);
        image1.transform = CGAffineTransformMakeRotation(-69);

        [UIView commitAnimations];
        image1.center = CGPointMake(30,870);          
    }

-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *) event {

    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:self.view];

    if([touch view] == image1){
        image1.userInteractionEnabled = YES;
        [self.view addSubview:image1];
        image1.center = location;
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:0.14];
        [UIView setAnimationRepeatAutoreverses:YES];
        [UIView setAnimationRepeatCount:1000000];

        image1.transform = CGAffineTransformMakeRotation(69);
        image1.transform = CGAffineTransformMakeRotation(-69);

        [UIView commitAnimations];  
    }

答案

我没有使用'touches functions'，而是使用了gestureRecognizers。您可以在特定图像上放置识别器（LongpressRecognizer的TapRecognizer）。当用户按下图像时，App识别触摸。之后，您可以使用“[self.view addSubview：yourImage]”功能将图像放在普通视图顶部的子视图中;

这是一个片段

首先，在viewDidLoad，viewDidAppear或viewWillappear方法中声明gesturerecognizer

UILongPressGestureRecognizer *longPress =
    [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressed:)];
    longPress.minimumPressDuration = 0.7;
    [yourimage addGestureRecognizer:longPress1];

之后您使用委托功能

-(void)longPressed:(UILongPressGestureRecognizer *)sender {

    CGPoint location = [sender locationInView:self.view];

    [self.view addSubview:yourimage];
    yourimage.center = location;
    //perform a transform (wiggle or scale)
    if([(UILongPressGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) {
        yourimage.transform = CGAffineTransformMakeScale(1.0, 1.0);
        //stop the transform

    }   
}

希望这能帮助你解决Elppa问题