的iOS +的MKMapView用户基于触摸的图(iOS + MKMapView user touc

2019-08-07 03:53发布

站内文章 / 后端开发
6 0 0

我寻觅了很多关于这个问题，但他们都不做的正是我想要的。 很多教程告诉我如何添加线条和多边形的代码，但不能与写意画。

现在的问题是下列之一：

我建立一个房地产应用。 如果用户是在MKMapView它来绘制一个矩形/圆圈的能力/ ...大概只是他/她想要买/租到房子的某个区域。 然后我需要显示用户已选择的区域内对应的结果。

目前，我有一个UIView我之上MKMapView在那里我做了一些自定义绘制，有没有办法来翻译点从或坐标..？ 或者，这是完全没有做到这一点的呢？ 我也听说过MKMapOverlayView等。但我不完全知道如何使用它。

任何人都可以点我在正确的方向或者他有一些示例代码或教程，可以帮助我完成我什么需要？

谢谢

Answer 1:

我有一个应用程序，基本上做到这一点。 我有一个地图视图，在屏幕顶部的工具栏。 当您按下该工具栏上的按钮，你现在是在一个模式，你可以在地图上滑动手指。 开始和滑动的端将代表一个矩形的角。 该应用程序将绘制一个半透明的蓝色矩形覆盖，以显示您所选择的区域。 当你抬起手指，矩形选择完成，以及应用程序开始搜索在我的数据库位置。

我不处理的圈子，但我想你可以做同样的事情，你有两种选择模式（矩形或圆形）。 在圆形选择模式中，滑动开始和结束点可以表示圆心，和边缘（半径）。 或者说，一条直径线的两端。 我会离开的那部分给你。

履行

首先，我定义了一个透明覆盖层，用于处理选择（OverlaySelectionView.h）： 

#import <QuartzCore/QuartzCore.h>
#import <MapKit/MapKit.h>

@protocol OverlaySelectionViewDelegate
// callback when user finishes selecting map region
- (void) areaSelected: (CGRect)screenArea;
@end


@interface OverlaySelectionView : UIView {
@private    
    UIView* dragArea;
    CGRect dragAreaBounds;
    id<OverlaySelectionViewDelegate> delegate;
}

@property (nonatomic, assign) id<OverlaySelectionViewDelegate> delegate;

@end

和OverlaySelectionView.m： 

#import "OverlaySelectionView.h"

@interface OverlaySelectionView()
@property (nonatomic, retain) UIView* dragArea;
@end

@implementation OverlaySelectionView

@synthesize dragArea;
@synthesize delegate;

- (void) initialize {
    dragAreaBounds = CGRectMake(0, 0, 0, 0);
    self.userInteractionEnabled = YES;
    self.multipleTouchEnabled = NO;
    self.backgroundColor = [UIColor clearColor];
    self.opaque = NO;
    self.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
}

- (id) initWithCoder: (NSCoder*) coder {
    self = [super initWithCoder: coder];
    if (self != nil) {
        [self initialize];
    }
    return self;
}

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

- (void)drawRect:(CGRect)rect {
    // do nothing
}

#pragma mark - Touch handling

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch* touch = [[event allTouches] anyObject];
    dragAreaBounds.origin = [touch locationInView:self];
}

- (void)handleTouch:(UIEvent *)event {
    UITouch* touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:self];

    dragAreaBounds.size.height = location.y - dragAreaBounds.origin.y;
    dragAreaBounds.size.width = location.x - dragAreaBounds.origin.x;

    if (self.dragArea == nil) {
        UIView* area = [[UIView alloc] initWithFrame: dragAreaBounds];
        area.backgroundColor = [UIColor blueColor];
        area.opaque = NO;
        area.alpha = 0.3f;
        area.userInteractionEnabled = NO;
        self.dragArea = area;
        [self addSubview: self.dragArea];
        [dragArea release];
    } else {
        self.dragArea.frame = dragAreaBounds;
    }
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    [self handleTouch: event];
}

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

    if (self.delegate != nil) {
        [delegate areaSelected: dragAreaBounds];
    }
    [self initialize];
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    [self initialize];
    [self.dragArea removeFromSuperview];
    self.dragArea = nil;
}

#pragma mark -

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

@end

然后，我有实现上述（MapViewController.h）中定义的协议的类： 

#import "OverlaySelectionView.h"

typedef struct {
    CLLocationDegrees minLatitude;
    CLLocationDegrees maxLatitude;
    CLLocationDegrees minLongitude;
    CLLocationDegrees maxLongitude;
} LocationBounds;

@interface MapViewController : UIViewController<MKMapViewDelegate, OverlaySelectionViewDelegate> {
    LocationBounds searchBounds;
    UIBarButtonItem* areaButton;

而在我MapViewController.m，该areaSelected方法是我进行触摸的坐标转换与地理坐标convertPoint:toCoordinateFromView: 

#pragma mark - OverlaySelectionViewDelegate

- (void) areaSelected: (CGRect)screenArea
{       
    self.areaButton.style = UIBarButtonItemStyleBordered;
    self.areaButton.title = @"Area";

    CGPoint point = screenArea.origin;
    // we must account for upper nav bar height!
    point.y -= 44;
    CLLocationCoordinate2D upperLeft = [mapView convertPoint: point toCoordinateFromView: mapView];
    point.x += screenArea.size.width;
    CLLocationCoordinate2D upperRight = [mapView convertPoint: point toCoordinateFromView: mapView];
    point.x -= screenArea.size.width;
    point.y += screenArea.size.height;
    CLLocationCoordinate2D lowerLeft = [mapView convertPoint: point toCoordinateFromView: mapView];
    point.x += screenArea.size.width;
    CLLocationCoordinate2D lowerRight = [mapView convertPoint: point toCoordinateFromView: mapView];

    searchBounds.minLatitude = MIN(lowerLeft.latitude, lowerRight.latitude);
    searchBounds.minLongitude = MIN(upperLeft.longitude, lowerLeft.longitude);
    searchBounds.maxLatitude = MAX(upperLeft.latitude, upperRight.latitude);
    searchBounds.maxLongitude = MAX(upperRight.longitude, lowerRight.longitude);

    // TODO: comment out to keep search rectangle on screen
    [[self.view.subviews lastObject] removeFromSuperview];

    [self performSelectorInBackground: @selector(lookupHistoryByArea) withObject: nil];
}

// this action is triggered when user selects the Area button to start selecting area
// TODO: connect this to areaButton yourself (I did it in Interface Builder)
- (IBAction) selectArea: (id) sender
{
    PoliteAlertView* message = [[PoliteAlertView alloc] initWithTitle: @"Information"
                                                              message: @"Select an area to search by dragging your finger across the map"
                                                             delegate: self
                                                              keyName: @"swipe_msg_read"
                                                    cancelButtonTitle: @"Ok"
                                                    otherButtonTitles: nil];
    [message show];
    [message release];

    OverlaySelectionView* overlay = [[OverlaySelectionView alloc] initWithFrame: self.view.frame];
    overlay.delegate = self;
    [self.view addSubview: overlay];
    [overlay release];

    self.areaButton.style = UIBarButtonItemStyleDone;
    self.areaButton.title = @"Swipe";
}

你会发现，我MapViewController有一个属性， areaButton 。 这是我的工具栏，通常所说区上的按钮。 在用户按下它之后，他们在区域选择模式，此时，按钮标签将更说刷卡提醒他们刷卡（也许不是最好的UI，但是这就是我）。

还要注意，当用户按下区进入区域选择模式，我告诉他们，告诉他们，他们需要刷卡警报。 因为这可能只是他们需要看到一次的提醒，我用我自己的PoliteAlertView ，这是一个自定义UIAlertView ，用户可以抑制（不再显示警报）。

我lookupHistoryByArea仅仅是搜索我的位置的数据库，通过保存的方法searchBounds （背景），然后在地图找到的位置上绘制新的叠加。 这显然会为您的应用程序不同。

限制

  • 由于这是让用户选择近似的地方，我没有考虑地理精度是至关重要的。 这听起来并不像它应该是在你的应用程序，无论是。 因此，我刚刚绘制矩形以90度角，不占地球曲率等，对于只有几英里的地方，这应该是罚款。

  • 我不得不做出有关短语基于触摸的绘图一些假设。 我决定，无论是最简单的方法来实现应用程序，最简单的触摸屏用户使用，是简单地确定一个单一的刷卡区。 绘制与触摸矩形将需要4个刷卡，而不是一个，引进非闭合矩形的复杂性，产量马虎的形状，而且可能得不到什么，他们甚至想用户。 所以，我试图保持用户界面简单。 如果你真的希望用户在地图上绘制 ， 看到这个相关的答案，这是否 。

  • 此应用ARC之前写的，而不是改变ARC。

  • 在我的应用程序，实际上我使用互斥锁的主（UI）线程访问一些变量， 并在后台（搜索）线程。 我把代码出了这个例子。 根据您的数据库搜索的工作原理，以及如何选择运行搜索（GCD等），你应该确保审核自己的线程安全。



Answer 2:

这是我的路怎么我的触摸转换为CLLocation上MKMapView 。

它的工作原理与谷歌地图和苹果地图 ，以及： 

- (void)viewDidLoad {
    // ...

    // ... where the _customMapView is a MKMapView object;

    // find the gesture recogniser of the map
    UIGestureRecognizer *_factoryDoubleTapGesture = nil;
    NSArray *_gestureRecognizersArray = [_customMapView gestureRecognizers];
    for (UIGestureRecognizer *_tempRecogniser in _gestureRecognizersArray) {
        if ([_tempRecogniser isKindOfClass:[UITapGestureRecognizer class]]) {
            if ([(UITapGestureRecognizer *)_tempRecogniser numberOfTapsRequired] == 2) {
                _factoryDoubleTapGesture = _tempRecogniser;
                break;
            }
        }
    }

    // my tap gesture recogniser
    UITapGestureRecognizer *_locationTapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(mapLocationTouchedUpInside:)];
    if (_factoryDoubleTapGesture) [_locationTapGesture requireGestureRecognizerToFail:_factoryDoubleTapGesture];
    [_customMapView addGestureRecognizer:_locationTapGesture];

    // ...
}

和... 

- (void)mapLocationTouchedUpInside:(UITapGestureRecognizer *)sender {
    CGPoint _tapPoint = [sender locationInView:_customMapView];
    CLLocationCoordinate2D _coordinates = [_customMapView convertPoint:_tapPoint toCoordinateFromView:_customMapView];

    // ... do whatever you'd like with the coordinates
}


Answer 3:

ViewController.h 

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

ViewController.m 

#import "ViewController.h"
#import <MapKit/MapKit.h>

@interface ViewController () <MKMapViewDelegate>
@property (weak, nonatomic) IBOutlet MKMapView *mapView;
@property (nonatomic, weak) MKPolyline *polyLine;
@property (nonatomic, strong) NSMutableArray *coordinates;
@property (weak, nonatomic) IBOutlet UIButton *drawPolygonButton;
@property (nonatomic) BOOL isDrawingPolygon;
@end

@implementation ViewController
@synthesize coordinates = _coordinates;

- (NSMutableArray*)coordinates
{
    if(_coordinates == nil) _coordinates = [[NSMutableArray alloc] init];
    return _coordinates;
}

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

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

- (IBAction)didTouchUpInsideDrawButton:(UIButton*)sender
{
    if(self.isDrawingPolygon == NO) {

        self.isDrawingPolygon = YES;
        [self.drawPolygonButton setTitle:@"done" forState:UIControlStateNormal];
        [self.coordinates removeAllObjects];
        self.mapView.userInteractionEnabled = NO;

    } else {

        NSInteger numberOfPoints = [self.coordinates count];

        if (numberOfPoints > 2)
        {
            CLLocationCoordinate2D points[numberOfPoints];
            for (NSInteger i = 0; i < numberOfPoints; i++)
                points[i] = [self.coordinates[i] MKCoordinateValue];
            [self.mapView addOverlay:[MKPolygon polygonWithCoordinates:points count:numberOfPoints]];
        }

        if (self.polyLine)
            [self.mapView removeOverlay:self.polyLine];

        self.isDrawingPolygon = NO;
        [self.drawPolygonButton setTitle:@"draw" forState:UIControlStateNormal];
        self.mapView.userInteractionEnabled = YES;

    }
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    if (self.isDrawingPolygon == NO)
        return;

    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInView:self.mapView];
    CLLocationCoordinate2D coordinate = [self.mapView convertPoint:location toCoordinateFromView:self.mapView];

    [self addCoordinate:coordinate];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    if (self.isDrawingPolygon == NO)
        return;

    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInView:self.mapView];
    CLLocationCoordinate2D coordinate = [self.mapView convertPoint:location toCoordinateFromView:self.mapView];

    [self addCoordinate:coordinate];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    if (self.isDrawingPolygon == NO)
        return;

    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInView:self.mapView];
    CLLocationCoordinate2D coordinate = [self.mapView convertPoint:location toCoordinateFromView:self.mapView];

    [self addCoordinate:coordinate];
    [self didTouchUpInsideDrawButton:nil];

}

- (void)addCoordinate:(CLLocationCoordinate2D)coordinate
{
    [self.coordinates addObject:[NSValue valueWithMKCoordinate:coordinate]];

    NSInteger numberOfPoints = [self.coordinates count];
    if (numberOfPoints > 2) {
        MKPolyline *oldPolyLine = self.polyLine;
        CLLocationCoordinate2D points[numberOfPoints];
        for (NSInteger i = 0; i < numberOfPoints; i++) {
            points[i] = [self.coordinates[i] MKCoordinateValue];
        }
        MKPolyline *newPolyLine = [MKPolyline polylineWithCoordinates:points count:numberOfPoints];
        [self.mapView addOverlay:newPolyLine];

        self.polyLine = newPolyLine;
        if (oldPolyLine) {
            [self.mapView removeOverlay:oldPolyLine];
        }
    }
}

#pragma mark - MKMapViewDelegate

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
    MKOverlayPathView *overlayPathView;

    if ([overlay isKindOfClass:[MKPolygon class]])
    {
        overlayPathView = [[MKPolygonView alloc] initWithPolygon:(MKPolygon*)overlay];

        overlayPathView.fillColor = [[UIColor cyanColor] colorWithAlphaComponent:0.2];
        overlayPathView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.7];
        overlayPathView.lineWidth = 3;

        return overlayPathView;
    }

    else if ([overlay isKindOfClass:[MKPolyline class]])
    {
        overlayPathView = [[MKPolylineView alloc] initWithPolyline:(MKPolyline *)overlay];

        overlayPathView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.7];
        overlayPathView.lineWidth = 3;

        return overlayPathView;
    }

    return nil;
}

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
    if ([annotation isKindOfClass:[MKUserLocation class]])
        return nil;

    static NSString * const annotationIdentifier = @"CustomAnnotation";

    MKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:annotationIdentifier];

    if (annotationView)
    {
        annotationView.annotation = annotation;
    }
    else
    {
        annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:annotationIdentifier];
        annotationView.image = [UIImage imageNamed:@"annotation.png"];
        annotationView.alpha = 0.5;
    }

    annotationView.canShowCallout = NO;

    return annotationView;
}

@end

或者你可以在这里找到整个项目： https://github.com/tazihosniomar/MapKitDrawing

我希望它会帮助你。



Answer 4:

尝试MKOverlayPathView。 在按图纸上的MKMapView的路径表示一个区域的问题是，除非你知道缩放比例，你不知道多少。 所以，你必须跟踪。



文章来源: iOS + MKMapView user touch based drawing
标签： ios uiview touch mapkit
举报

收藏的人(0)

Ta的文章 更多文章
登录 后发表评论
0条评论
还没有人评论过~