原始地址：iOS 6苹果地图应用（MapKit）－内置开发

本文是苹果案例RegionDefiner的注释。

#import "ViewController.h"
#import "MyAnnotation.h"
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.mainMapView = [[MKMapView alloc] init];
self.mainMapView.delegate = self;
[self.mainMapView setUserInteractionEnabled: YES];
[self.mainMapView setScrollEnabled: YES];
UIToolbar *toolbar = [[UIToolbar alloc] init];
toolbar.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth;
[toolbar sizeToFit];
CGSize containerSize = self.view.bounds.size;
CGSize toolbarSize = toolbar.bounds.size;
UIBarButtonItem *resetButton = [[UIBarButtonItem alloc] initWithTitle:@"Reset"
style: UIBarButtonItemStyleBordered
target: self
action: @selector(removePins)];
UIBarButtonItem *flexibleSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
UIBarButtonItem *share = [[UIBarButtonItem alloc] initWithTitle: @"Log"
style: UIBarButtonItemStyleBordered
target: self
action: @selector(tappedShare)];
toolbar.frame = CGRectMake(0, containerSize.height - toolbarSize.height, containerSize.width, toolbarSize.height);
self.mainMapView.frame = CGRectMake(0, 0, containerSize.width, containerSize.height - toolbarSize.height);
[self.view addSubview:self.mainMapView];
[self.view addSubview:toolbar];
//工具条上添加"重置按钮","空白","日志按钮"
[toolbar setItems:@[ resetButton, flexibleSpace, share ]];
[self setUpGesture];
self.itemsArray = [[NSMutableArray alloc] init];
}
- (void)viewDidUnload
{
[self setMainMapView:nil];
[super viewDidUnload];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
} else {
return YES;
}
}
#pragma mark -
#pragma mark Dropping pins
//添加长按手势
- (void)setUpGesture
{
self.longPress = [[UILongPressGestureRecognizer alloc] initWithTarget: self
action: @selector(handleLongPress:)];
self.longPress.delegate = self;
[self.view addGestureRecognizer:self.longPress];
}
//处理长按手势
- (void)handleLongPress:(UILongPressGestureRecognizer *)recognizer
{
if (recognizer.state == UIGestureRecognizerStateBegan)
{
CGPoint longPressPoint = [recognizer locationInView:self.view];
//在此点绘制大头针
[self dropPinAtPoint:longPressPoint];
}
}
- (void)updatePolygon
{
CLLocationCoordinate2D *points = malloc(sizeof(CLLocationCoordinate2D) * self.itemsArray.count);
NSUInteger i = 0;
for (MyAnnotation *pin in self.itemsArray)
{
//添加所有坐标的经纬度
points[i] = pin.coordinate;
i++;
}
//清除地图上上次绘制的图形
[self.mainMapView removeOverlay:self.polygon];
//绘制多边形
self.polygon = [MKPolygon polygonWithCoordinates:points count:self.itemsArray.count];
[self.mainMapView addOverlay:self.polygon];
}
- (void) dropPinAtPoint: (CGPoint) pointToConvert
{
//把视图上的点转换成经纬度
CLLocationCoordinate2D convertedPoint = [self.mainMapView convertPoint: pointToConvert toCoordinateFromView: self.view];
//大头针的标题
NSString *pinTitle = [NSString stringWithFormat: @"Pin number %i", self.itemsArray.count];
//大头针的子标题，显示经纬度
NSString *subCoordinates = [NSString stringWithFormat: @"%f, %f", convertedPoint.latitude, convertedPoint.longitude];
MyAnnotation *droppedPin = [[MyAnnotation alloc] initWithCoordinate: convertedPoint title: pinTitle subtitle: subCoordinates];
//在地图上添加这个标记
[self.mainMapView addAnnotation:droppedPin];
//加入数组
[self.itemsArray addObject:droppedPin];
//更新多边形
[self updatePolygon];
}
- (void)removePins
{
//移除标记
[self.mainMapView removeAnnotations:self.mainMapView.annotations];
//重置
[self.itemsArray removeAllObjects];
//清除绘制的多边形
[self.mainMapView removeOverlay:self.polygon];
//更新多边形
[self updatePolygon];
}
#pragma mark - Output
//操作日志
- (void)tappedShare
{
NSLog(@"%@", [self coordinates]);
}
- (NSString *)coordinates
{
//绘制多边形至少需要三个点
if (self.itemsArray.count < 3)
{
return @"Minimum of 3 vertices requried to make polygon.";
}
NSString *masterString = @"\n{ \"type\": \"MultiPolygon\",\n \"coordinates\": [\n[[";
for (MyAnnotation *pin in self.itemsArray)
{
masterString = [masterString stringByAppendingFormat: @"[%f, %f],\n", pin.coordinate.longitude, pin.coordinate.latitude];
}
// GeoJSON requires that the first and last vertices be identical
MyAnnotation *firstPin = [self.itemsArray objectAtIndex:0];
masterString = [masterString stringByAppendingFormat: @"[%f, %f],\n", firstPin.coordinate.longitude, firstPin.coordinate.latitude];
masterString = [masterString stringByAppendingString: @"]]\n]\n}\n"];
masterString = [masterString stringByReplacingOccurrencesOfString: @"],\n]]" withString: @"]]]"];
return masterString;
}
#pragma mark - MKMapViewDelegate
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay
{
if (self.polygonView && self.polygonView.polygon == self.polygon)
return self.polygonView;
self.polygonView = [[MKPolygonView alloc] initWithPolygon:self.polygon];
//填充色
self.polygonView.fillColor = [UIColor colorWithRed:0 green:1 blue:0 alpha:0.3f];
//边界颜色
self.polygonView.strokeColor = [UIColor colorWithRed:0 green:1 blue:0 alpha:0.9f];
//边线宽度
self.polygonView.lineWidth = 1.0f;
return self.polygonView;
}
@end