前言
在ios上边使用地图库的同学肯定遇到过这样的问题:吹出框只能设置title和subtitle和左右的view,不管是百度地图还是高德地图还是自带的google地图,只提供了这四个属性,如果想添加更多的view,只能自定义。可是,类库只能看到.h文件,.m都看不到,这让新手比较蛋疼,庞大的地图类库一时半会摸不着头脑,从头再学还需要时间,本文就教大家快速制作一个属于自己的 CalloutView!等你一步一步调通后,再回过头来使用系统自带的方法设置callout,就会领悟这个过程。
正文
Xcode版本:4.6.1
SDK版本:6.0
百度地图版本:1.2.2(关于地图不必纠结,无论是百度还是高德还是google都是基于系统的MapKit,都是一样的)
demo模式:非ARC,使用storyboard。
demo资源:
http://download.csdn.net/detail/mad1989/5252037
Step1
创建demo,并添加百度地图的静态类库,helloword能显示mapview
关于这一步我专门写了教程,这里就不再赘述,同样,关于如何使用自带的BMKPointAnnotation添加一个marker,我也不再说了,如果连这个你都不会,那么先去官网看一下基本教程。
Step2
实现三个委托方法:
这个方法类似tableview添加cell,都是创建annotation
- #pragma mark
- #pragma mark - BMKMapview delegate
- -(BMKAnnotationView *)mapView:(BMKMapView *)mapView viewForAnnotation:(id)annotation;
这个方法在点击地图marker时所触发(并显示callout)
- -(void)mapView:(BMKMapView *)mapView didSelectAnnotationView:(BMKAnnotationView *)view;
这个方法在点击地图任意位置,相当于隐藏callout
- -(void)mapView:(BMKMapView *)mapView didDeselectAnnotationView:(BMKAnnotationView *)view;
原理:地图上的marker是在viewForAnnoation里创建的,同时也会隐含的为我们创建一个CalloutView,就是自带的吹出框,只是我们看不到源码。其实这个吹出框(CalloutView)也是一个annotation,也会在viewForAnnotation里被创建,他的坐标应该和这个点的marker坐标一样,只要明白了这一点,就行了,marker和吹出框是两个不同的annotation,他们有同样的coordinate。
Step3
自定义一个Annotation,为了简单方便,我就直接继承了mapview自带的BMKPointAnnotation,这是一个经典的图钉marker。
在这里我添加了一个Dictionary属性,目的是为了自定义的CalloutView吹出框显示内容赋值,一会就明白了。
Step4
添加自定义Annotation到mapview
-
- CLLocationCoordinate2D center = {39.91669,116.39716};
-
- CustomPointAnnotation *pointAnnotation = [[CustomPointAnnotation alloc] init];
- pointAnnotation.title = @"我是中国人";
- pointAnnotation.subtitle = @"我爱自己的祖国";
-
- pointAnnotation.coordinate = center;
- [mymapview addAnnotation:pointAnnotation];
- [pointAnnotation release];
在viewForanntion里,由于我对marker没太大要求,直接使用了
BMKPinAnnotationView(图钉),简单设置image属性为自己需要的图标,如下所示:
展示一个效果图:
显然CalloutView只能设置title和subtitle,无法满足我们的要求,那么继续下一步。
Step5
创建一个(自定义的CalloutView)的Annotation,相当于显示calloutView的annotation。
[注意] 继承自NSObject<BMKAnnotation>
CalloutMapAnnotation.h
- #import
- #import "BMapKit.h"
-
- @interface CalloutMapAnnotation : NSObject
-
-
- @property (nonatomic) CLLocationDegrees latitude;
- @property (nonatomic) CLLocationDegrees longitude;
-
-
- @property(retain,nonatomic) NSDictionary *locationInfo;
-
-
-
- - (id)initWithLatitude:(CLLocationDegrees)lat andLongitude:(CLLocationDegrees)lon;
-
-
-
- @end
CalloutMapAnnotation.m
- #import "CalloutMapAnnotation.h"
-
- @implementation CalloutMapAnnotation
-
-
- @synthesize latitude;
- @synthesize longitude;
- @synthesize locationInfo;
-
- - (id)initWithLatitude:(CLLocationDegrees)lat
- andLongitude:(CLLocationDegrees)lon {
- if (self = [super init]) {
- self.latitude = lat;
- self.longitude = lon;
- }
- return self;
- }
-
-
- -(CLLocationCoordinate2D)coordinate{
-
- CLLocationCoordinate2D coordinate;
- coordinate.latitude = self.latitude;
- coordinate.longitude = self.longitude;
- return coordinate;
-
-
- }
-
-
- @end
这里设置了经纬度的属性,和一个init初始化经纬度的方法(经纬度=marker的经纬度),同样添加了一个Dictionary的属性,为了传递在CalloutView上内容的赋值,继续。
Step6
这一步我们创建自定义的View,想要什么布局就写什么样的布局,想要多少属性就加多少属性,这里我使用了code方式画了一个contentView,里面的子view使用Xib方式创建。
[注意:继承自BMKAnnotationView]
CallOutAnnotationView.h
- #import "BMKAnnotationView.h"
- #import "BusPointCell.h"
-
- @interface CallOutAnnotationView : BMKAnnotationView
-
-
- @property(nonatomic,retain) UIView *contentView;
-
-
- @property(nonatomic,retain) BusPointCell *busInfoView;
-
-
- @end
BusPointCell是ContentView里的subview,这个view就是显示各个组件,并赋不同的值
CallOutAnnotationView.m
- #import "CallOutAnnotationView.h"
- #import
-
-
- #define Arror_height 6
-
- @implementation CallOutAnnotationView
- @synthesize contentView;
- @synthesize busInfoView;
-
- - (id)initWithFrame:(CGRect)frame
- {
- self = [super initWithFrame:frame];
- if (self) {
- }
- return self;
- }
-
- -(void)dealloc{
- [contentView release];
- [busInfoView release];
- [super dealloc];
- }
-
- -(id)initWithAnnotation:(id)annotation reuseIdentifier:(NSString *)reuseIdentifier{
-
-
- self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier];
- if (self) {
- self.backgroundColor = [UIColor clearColor];
- self.canShowCallout = NO;
- self.centerOffset = CGPointMake(0, -55);
- self.frame = CGRectMake(0, 0, 240, 80);
-
- UIView *_contentView = [[UIView alloc] initWithFrame:CGRectMake(5, 5, self.frame.size.width-15, self.frame.size.height-15)];
- _contentView.backgroundColor = [UIColor clearColor];
- [self addSubview:_contentView];
- self.contentView = _contentView;
- [_contentView release];
- }
- return self;
-
- }
-
- -(void)drawRect:(CGRect)rect{
-
- [self drawInContext:UIGraphicsGetCurrentContext()];
-
- self.layer.shadowColor = [[UIColor blackColor] CGColor];
- self.layer.shadowOpacity = 1.0;
- self.layer.shadowOffset = CGSizeMake(0.0f, 0.0f);
-
-
- }
-
- -(void)drawInContext:(CGContextRef)context
- {
-
- CGContextSetLineWidth(context, 2.0);
- CGContextSetFillColorWithColor(context, [UIColor colorWithRed:255.0/255.0 green:255.0/255.0 blue:255.0/255.0 alpha:1.0].CGColor);
-
- [self getDrawPath:context];
- CGContextFillPath(context);
-
- }
- - (void)getDrawPath:(CGContextRef)context
- {
- CGRect rrect = self.bounds;
- CGFloat radius = 6.0;
-
- CGFloat minx = CGRectGetMinX(rrect),
- midx = CGRectGetMidX(rrect),
- maxx = CGRectGetMaxX(rrect);
- CGFloat miny = CGRectGetMinY(rrect),
-
- maxy = CGRectGetMaxY(rrect)-Arror_height;
- CGContextMoveToPoint(context, midx+Arror_height, maxy);
- CGContextAddLineToPoint(context,midx, maxy+Arror_height);
- CGContextAddLineToPoint(context,midx-Arror_height, maxy);
-
- CGContextAddArcToPoint(context, minx, maxy, minx, miny, radius);
- CGContextAddArcToPoint(context, minx, minx, maxx, miny, radius);
- CGContextAddArcToPoint(context, maxx, miny, maxx, maxx, radius);
- CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius);
- CGContextClosePath(context);
- }
-
-
-
- @end
BusPointCell.h
想要多少label,就可以有多少label
- #import
-
- @interface BusPointCell : UIView
- @property (retain, nonatomic) IBOutlet UILabel *aliasLabel;
- @property (retain, nonatomic) IBOutlet UILabel *speedLabel;
- @property (retain, nonatomic) IBOutlet UILabel *degreeLabel;
- @property (retain, nonatomic) IBOutlet UILabel *nameLabel;
-
- @end
BusPointCell.m
- #import "BusPointCell.h"
-
- @implementation BusPointCell
-
- - (id)initWithFrame:(CGRect)frame
- {
- self = [super initWithFrame:frame];
- if (self) {
-
- }
- return self;
- }
- - (void)dealloc {
- [_aliasLabel release];
- [_speedLabel release];
- [_degreeLabel release];
- [_nameLabel release];
- [super dealloc];
- }
- @end
BusPointCell.xib
Step7
自定义的CalloutView都准备妥当,现在就是要实现他们的部分了,简单说一下原理,在didSelectAnnotationView函数里创建并添加calloutview的annotation(CalloutMapAnnotation),然后在viewForAnnotation函数内实例化要显示的calloutview(CallOutAnnotationView)
首先声明一个局部变量CalloutMapAnnotation *_calloutMapAnnotation;
在didSelectAnnotationView函数内添加如下代码:
-
- CustomPointAnnotation *annn = (CustomPointAnnotation*)view.annotation;
-
-
- if ([view.annotation isKindOfClass:[CustomPointAnnotation class]]) {
-
-
- if (_calloutMapAnnotation.coordinate.latitude == view.annotation.coordinate.latitude&&
- _calloutMapAnnotation.coordinate.longitude == view.annotation.coordinate.longitude) {
- return;
- }
-
- if (_calloutMapAnnotation) {
- [mapView removeAnnotation:_calloutMapAnnotation];
- _calloutMapAnnotation=nil;
-
- }
-
- _calloutMapAnnotation = [[[CalloutMapAnnotation alloc] initWithLatitude:view.annotation.coordinate.latitude andLongitude:view.annotation.coordinate.longitude] autorelease];
-
-
- _calloutMapAnnotation.locationInfo = annn.pointCalloutInfo;
-
- [mapView addAnnotation:_calloutMapAnnotation];
-
-
-
- [mapView setCenterCoordinate:view.annotation.coordinate animated:YES];
-
- }
其次,要在viewForAnnotation里创建我们的calloutview(CallOutAnnotationView),添加如下代码:
- else if ([annotation isKindOfClass:[CalloutMapAnnotation class]]){
-
-
- CalloutMapAnnotation *ann = (CalloutMapAnnotation*)annotation;
-
-
- CallOutAnnotationView *calloutannotationview = (CallOutAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:@"calloutview"];
-
-
- if (!calloutannotationview) {
- calloutannotationview = [[[CallOutAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"calloutview"] autorelease];
-
- BusPointCell *cell = [[[NSBundle mainBundle] loadNibNamed:@"BusPointCell" owner:self options:nil] objectAtIndex:0];
-
- [calloutannotationview.contentView addSubview:cell];
- calloutannotationview.busInfoView = cell;
- }
-
-
- calloutannotationview.busInfoView.aliasLabel.text = [ann.locationInfo objectForKey:@"alias"];
- calloutannotationview.busInfoView.speedLabel.text = [ann.locationInfo objectForKey:@"speed"];
- calloutannotationview.busInfoView.degreeLabel.text =[ann.locationInfo objectForKey:@"degree"];
- calloutannotationview.busInfoView.nameLabel.text = [ann.locationInfo objectForKey:@"name"];
-
- return calloutannotationview;
-
- }
[注意]在添加marker的判断里一定要设置marker
annotation.canShowCallout =NO; 否则点击marker会默认显示系统的吹出框
Step8
calloutview的annotation也创建和添加了,接下来我们就设置一下marker对应吹出框的数据:
然后运行一下:
哈哈!搞定了吧,具体布局可以自己通过code方式,或xib方式设计,目前点击marker能显示了,可是点击其它区域还是无法显示,所以我们在didDeselectAnnotationView方法里还需要判断一下,remove掉。
- -(void)mapView:(BMKMapView *)mapView didDeselectAnnotationView:(BMKAnnotationView *)view{
-
- if (_calloutMapAnnotation&&![view isKindOfClass:[CallOutAnnotationView class]]) {
-
- if (_calloutMapAnnotation.coordinate.latitude == view.annotation.coordinate.latitude&&
- _calloutMapAnnotation.coordinate.longitude == view.annotation.coordinate.longitude) {
- [mapView removeAnnotation:_calloutMapAnnotation];
- _calloutMapAnnotation = nil;
- }
-
-
- }
-
- }
最后
之所以在显示marker的annotation[本文为CustomPointAnnotation]和显示calloutview的annotation[本文为CalloutMapAnnotation]里各添加一个Dictionary,就是要在点击时通过marker传递数据,添加时通过calloutview的annotation实例来设置每一个属性的数据,已达到不同的maker,显示不同的数据。
可能我的过程不是太清晰,自己仔细研究一下这三个函数和mapview自带的callout调用过程,便会明白。
dmeo地址:http://download.csdn.net/detail/mad1989/5252037