如何在自定义UIView下面的MKMapview中启用touchEvents（滚动和平移）？ [英] How to enable touchEvents (scroll and pan) in MKMapview below a custom UIView?

问题描述

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简而言之，我想弄清楚如何扩展在MKMapView（mapView）之上的自定义视图（geometryView）中实现的几何体（点，线和多边形）。

In a nutshell, I am trying to figure out how to scale the geometry (point, line, and polygon) implemented in a custom view (geometryView) on top of MKMapView (mapView).

我做的是..

1. 创建DrawMapViewController。在底部工具栏上添加UIBarButtonItems（MAP，PT，LN，PG）。

1. Create DrawMapViewController. Add the UIBarButtonItems (MAP, PT, LN, PG) on the bottom toolbar.

当您点击地图按钮时，您可以平移/缩放地图。这将通过设置geometryView.hidden = YES;

When you click on map button, you are able to pan/zoom on the Map. This enables the mapView by setting the geometryView.hidden = YES;

启用mapView。单击三个几何按钮中的任何一个时，geometryView将显示geometryView.hidden = NO，因此，启用touchEvents并从GeometryView.drawRect的方法中绘制几何。

When any of the three geometry buttons is clicked, the geometryView is displayed by geometryView.hidden = NO, thus, enabling touchEvents and drawing the geometry from GeometryView.drawRect's method.

图层排序如下：mapView位于geometryView的底部。

Layer ordering is as follows: mapView is at the bottom of geometryView.

-geometryView

-geometryView

-mapView

我的问题是什么？
理想情况下，在地图模式下以及当用户进行平移和缩放时，我希望是否可以从geometryView显示绘图。但是当用户点击map时，geometryView.hidden = YES，因此绘图消失。如果我使geometryView可见，那么用户与geometryView交互而不是mapView，因此没有缩放和平移。

What is my problem? Ideally, during "map" mode and when the user is panning and zooming, I am hoping if its possible to display the drawing from geometryView. But when the user hits "map", then geometryView.hidden = YES, thus the drawing disappears. If I make geometryView visible, then the user interacts with geometryView not mapView, so there's no zooming and panning.

在自定义视图显示时，是否可以在自定义视图下方处理MKMapView的touchEvents（平移/缩放）？非常感谢任何其他想法/方法。

Is it possible to handle touchEvents (pan/zoom) of MKMapView below a custom view while the custom View is displayed? Any other ideas/approaches is very much appreciated.

谢谢，

Rupert

GeometryView列表：

GeometryView Listing:

@synthesize mapview, pinFactory;

- (id)initWithFrame:(CGRect)frame{
    if (self = [super initWithFrame:frame]) {
    }
    return self;
}

- (void)drawRect:(CGRect)rect {
    // Drawing code
    NSLog(@"DrawRect called");

    CGContextRef context = UIGraphicsGetCurrentContext();

    // Drawing lines with a white stroke color
    CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1.0);
    // Draw them with a 2.0 stroke width so they are a bit more visible.
    CGContextSetLineWidth(context, 2.0);

    if(pinFactory.geometryState == 2){  //Draw Line

        if( [pinFactory actualPinCount] > 1){

            Pin *pin1 = (Pin *)[[pinFactory pinArray] objectAtIndex:0];
            CGPoint pt1 = pin1.touchLocation;
            CGContextMoveToPoint(context, pt1.x, pt1.y);

            for (int i = 1; i < ([pinFactory actualPinCount]); i++)
            {
                Pin *pin2 = (Pin *)[[pinFactory pinArray] objectAtIndex:i];
                CGPoint pt2 = pin2.touchLocation;
                CGContextAddLineToPoint(context, pt2.x, pt2.y);
            }

            CGContextStrokePath(context);
        }
    }
    else if(pinFactory.geometryState == 3){ //Draw Polygon
        //if there are two points, draw a line first.
        //if there are three points, fill the polygon
        if( [pinFactory actualPinCount] == 2){

            Pin *pin1 = (Pin *)[[pinFactory pinArray] objectAtIndex:0];
            CGPoint pt1 = pin1.touchLocation;
            CGContextMoveToPoint(context, pt1.x, pt1.y);

            Pin *pin2 = (Pin *)[[pinFactory pinArray] objectAtIndex:1];
            CGPoint pt2 = pin2.touchLocation;
            CGContextAddLineToPoint(context, pt2.x, pt2.y);

            CGContextStrokePath(context);
        }
        else if([pinFactory actualPinCount] > 2){

            //fill with a blue color
            CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1.0);

            Pin *pin1 = (Pin *)[[pinFactory pinArray] objectAtIndex:0];
            CGPoint pt1 = pin1.touchLocation;
            CGContextMoveToPoint(context, pt1.x, pt1.y);

            for (int i = 1; i < ([pinFactory actualPinCount]); i++)
            {

                Pin *pin2 = (Pin *)[[pinFactory pinArray] objectAtIndex:i];
                CGPoint pt2 = pin2.touchLocation;
                CGContextAddLineToPoint(context, pt2.x, pt2.y);
            }

            CGContextClosePath(context);

            CGContextDrawPath(context, kCGPathFillStroke);
        }
    }
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    [self setNeedsDisplay];

    UITouch* aTouch = [touches anyObject];
    location = [aTouch locationInView:self];
    NSLog(@"touchesBegan: x:%f, y:%f", location.x, location.y );

    CLLocationCoordinate2D coordinate = [mapview convertPoint:location toCoordinateFromView:self];

    switch (pinFactory.geometryState) {
        case 1:{
            if( [pinFactory actualPinCount] == 1){
                //[UIView beginAnimations:@"stalk" context:nil];
                //[UIView setAnimationDuration:1];
                //[UIView setAnimationBeginsFromCurrentState:YES];

                Pin *pin = (Pin *)[pinFactory getObjectAtIndex:0];
                [mapview removeAnnotation:pin];
                [pinFactory removeObject:pin];

                Pin *newPin = [[Pin alloc] initWithCoordinate:coordinate initLocation:location withTitle:@"My Pin"];
                [pinFactory addObject:newPin];
                [mapview addAnnotation:newPin];

                [newPin release];

                //[UIView commitAnimations];
            }
            else{
                //Lets add a new pin to the geometry
                Pin *pin = [[Pin alloc] initWithCoordinate:coordinate initLocation:location withTitle:@"My Pin"];
                [pinFactory addObject:pin];
                [mapview addAnnotation:pin];

                [pin release];
            }
            break;
        }
        case 2:{
            //Lets add a new pin
            Pin *pin = [[Pin alloc] initWithCoordinate:coordinate initLocation:location withTitle:@"My Pin"];
            [pinFactory addObject:pin];
            [mapview addAnnotation:pin];

            [pin release];
            [self setNeedsDisplay];

            break;
        }
        case 3:{
            //Lets add a new pin
            Pin *pin = [[Pin alloc] initWithCoordinate:coordinate initLocation:location withTitle:@"My Pin"];
            [pinFactory addObject:pin];
            [mapview addAnnotation:pin];

            [pin release];
            [self setNeedsDisplay];

            break;
        }
        default:
            break;
    }
}


- (void)dealloc {
    [super dealloc];
}


@end

DrawMapViewController列表：

DrawMapViewController Listing:

#import "DrawMapViewController.h"
#import "Pin.h"

@implementation DrawMapViewController

@synthesize mapview, mapBarButton, pointBarButton, lineBarButton, polygonBarButton, geometryView;

/*  State represents state of the map
 *  0 = map
 *  1 = point
 *  2 = line
 *  3 = polygon
 */

// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
        // Custom initialization
        self.title = @"Map";
    }
    return self;
}


// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
    mapview.mapType = MKMapTypeSatellite;


    NSMutableArray *pinArray = [[NSMutableArray alloc] initWithObjects:nil];
    pinFactory = [[PinFactory alloc] initWithArray:pinArray]; 
    pinFactory.map = mapview;
    [pinArray release];

    geometryView = [[GeometryView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 372.0f)];
    geometryView.pinFactory = pinFactory;
    geometryView.mapview = mapview;
    geometryView.backgroundColor = [UIColor clearColor];
    [self.view addSubview:geometryView];

    [self changeButtonAndViewState:0];
}


/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [mapBarButton release];
    [pointBarButton release];
    [lineBarButton release];
    [polygonBarButton release];

    [super dealloc];
}

- (IBAction)mapBarButtonPressed{
    NSLog(@"mapBarButtonPressed");
    [self changeButtonAndViewState:0];
}

- (IBAction)pointBarButtonPressed{
    NSLog(@"pointBarButtonPressed");
    [self changeButtonAndViewState:1];

    if( [pinFactory actualPinCount] > 0){
        [self resetGeometry];
    }   
}

- (IBAction)lineBarButtonPressed{
    NSLog(@"lineBarButtonPressed");

    if( [pinFactory actualPinCount] > 0){
        [self resetGeometry];
    }

    [self changeButtonAndViewState:2];
}

- (IBAction)polygonBarButtonPressed{
    NSLog(@"polygonBarButtonPressed");

    if( [pinFactory actualPinCount] > 0){
        [self resetGeometry];
    }

    [self changeButtonAndViewState:3];
}

- (void)resetGeometry{
    NSLog(@"resetting geometry.. deleting all pins");
    [mapview removeAnnotations:[pinFactory pinArray]];

    NSMutableArray *array = [pinFactory pinArray];
    [array removeAllObjects];

    [geometryView setNeedsDisplay];
}

- (void)changeButtonAndViewState:(int)s{
    [pinFactory setGeometryState:s];

    mapBarButton.style = UIBarButtonItemStyleBordered;
    pointBarButton.style = UIBarButtonItemStyleBordered;
    lineBarButton.style = UIBarButtonItemStyleBordered;
    polygonBarButton.style = UIBarButtonItemStyleBordered;

    pointBarButton.enabled = YES;
    lineBarButton.enabled = YES;
    polygonBarButton.enabled = YES;

    switch ([pinFactory geometryState]) {
        case 0:{
            mapBarButton.style = UIBarButtonItemStyleDone;
            geometryView.hidden = YES;
            break;
        }
        case 1:{
            pointBarButton.enabled = NO;

            pointBarButton.style = UIBarButtonItemStyleDone;

            geometryView.hidden = NO;
            break;
        }
        case 2:{
            lineBarButton.enabled = NO;

            lineBarButton.style = UIBarButtonItemStyleDone;

            geometryView.hidden = NO;
            break;
        }
        case 3:{
            polygonBarButton.enabled = NO;

            polygonBarButton.style = UIBarButtonItemStyleDone;

            geometryView.hidden = NO;

            break;
        }
        default:
            break;
    }
}

-(void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animate{
    NSLog(@"regionDidChangeAnimated");
}

@end

推荐答案

嘿，我看到没有人回答你，我只知道该怎么做。不幸的是你不能拦截事件并将它们转发到mapView，所以像

Hey I see nobody has answered you, and I just figured out how to do this. Unfortunately you cannot intercept events and forward them to the mapView so something like

@interface MapOverlay
   MKMapView* map;
@end

@implementation
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
   // Do my stuff
   foo();
   bar();
   // Forward to the map
   [map touchesBegan....];
}
@end

这是你想要做的但它会不行。由于某种原因，你不能拦截地图的事件，也不能反向和子类化MKMapView并重载它的触摸方法。我发现这样做的唯一方法如下。

This is what you want to do but it WILL NOT WORK. For some reason you cannot intercept the map's events, nor can you do the reverse and subclass MKMapView and overload it's touch methods. The only way I have found to do this is as follows.

创建MapOverlay视图，将其设置为具有透明背景并禁用触摸。在MKMapView上叠加它。然后执行以下操作

Create your MapOverlay view, set it to have a transparent background and disable touches to it. Overlay this on top of your MKMapView. Then do the following

使用自定义类的子类UIWindow将所有触摸转发到叠加层，将逻辑处理为如果叠加层未隐藏，则转发 ，或在叠加层本身保持状态。无论如何它看起来像这样

Subclass UIWindow with a custom class that will forward all touches to your overlay, either handling the logic as "if the overlay is not hidden, then forward", or in the overlay itself keep state. Anyway it looks like this

@implementation CustomWindow

- (void)sendEvent:(UIEvent*)event
{
   [super sendEvent:event];
   // Forward the event to the overlay
}

当你转发时将事件覆盖到叠加层，首先检查触摸是否在mapView区域内，然后找出它们的触摸类型，然后在叠加层上调用正确的触摸方法。

When you are forwarding the event to the overlay, you first check if the touches are inside of your mapView region, then figure out what type of touches they are, then call the correct touch method on your overlay.

祝你好运！

这篇关于如何在自定义UIView下面的MKMapview中启用touchEvents（滚动和平移）？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！