Question

我正在思考iOS上的Google Map街景视图引脚拖放系统。用户从另一个视图中选择一个引脚（让我们说UINavigationBar）并将其拖动到地图上的某个位置然后放下它。

我有点迷失了。您是否有此类互动的工作流程？

Answer 1

这是一项相当复杂的任务，但可以分为几个简单的步骤。

制作一个自定义UIView，触摸后会跟随触摸动作。

实施例

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    _originalPosition = self.view.center;
    _touchOffset = CGPointMake(self.view.center.x-position.x,self.view.center.y-position.y);
}

-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{        
    UITouch *touch = [touches anyObject];
    CGPoint position = [touch locationInView: self.view.superview];

    [UIView animateWithDuration:.001
                          delay:0.0
                        options:UIViewAnimationOptionCurveEaseInOut
                     animations:^ {

                         self.view.center = CGPointMake(position.x+_touchOffset.x, position.y+_touchOffset.y);
                     }
                     completion:^(BOOL finished) {}];
}

-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    CGPoint positionInView = [touch locationInView:self.view];
    CGPoint newPosition;
    if (CGRectContainsPoint(_desiredView.frame, positionInView)) {
        newPosition = positionInView;
        // _desiredView is view where the user can drag the view
    } else {
        newPosition = _originalPosition;
        // its outside the desired view so lets move the view back to start position
    }

    [UIView animateWithDuration:0.4
                          delay:0.0
                        options:UIViewAnimationOptionCurveEaseInOut
                     animations:^ {
                         self.view.center = newPosition
                         // to 
                     }
                     completion:^(BOOL finished) {}];

}

当用户松开手指时，您必须获取触摸位置。
计算地图视图坐标中的触摸位置并放置图钉。

希望它指出你正确的方向。

MKMapView引脚从另一个视图拖动

1 个答案:

实施例