iOS仿系統指南針

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高仿系統指南針,方向數據是地磁航向數據,有定位地理位置信息和地磁方向信息,可以和系統的指南針對比看一看。

一、運行效果

iOS仿系統指南針
iOS仿系統指南針

二、實現過程

1.繼承於UIView創建一個帶刻度標註的視圖ScaleView,利用UIBezierPath和CAShapeLayer、UILabel,默認0刻度(北)在最上方。

//化刻度表
- (void)paintingScale{
CGFloat perAngle = M_PI/(90);
NSArray *array = @[@"北",@"東",@"南",@"西"];
//畫圓環,每隔2°畫一個弧線,總共180條
for (int i = 0; i < 180; i++) {
CGFloat startAngle = (-(M_PI_2+M_PI/180/2)+perAngle*i);
CGFloat endAngle = startAngle+perAngle/2;
UIBezierPath *bezPath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(self.frame.size.width/2, self.frame.size.height/2)
radius:(self.frame.size.width/2 - 50)
startAngle:startAngle
endAngle:endAngle
clockwise:YES];
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
//每隔30°畫一個白條刻度
if (i%15 == 0) {
shapeLayer.strokeColor = [[UIColor whiteColor] CGColor];
shapeLayer.lineWidth = 20;
}else{
shapeLayer.strokeColor = [[UIColor grayColor] CGColor];
shapeLayer.lineWidth = 10;
}
shapeLayer.path = bezPath.CGPath;
shapeLayer.fillColor = [UIColor clearColor].CGColor;
[_backgroundView.layer addSublayer:shapeLayer];
//每隔30°畫一個刻度的標註 0 30 60...
if (i % 15 == 0){
NSString *tickText = [NSString stringWithFormat:@"%d",i * 2];
CGFloat textAngel = startAngle+(endAngle-startAngle)/2;
CGPoint point = [self calculateTextPositonWithArcCenter:CGPointMake(self.frame.size.width/2, self.frame.size.height/2)
Angle:textAngel andScale:1.2];
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(point.x, point.y, 30, 15)];
label.center = point;
label.text = tickText;
label.textColor = [UIColor whiteColor];
label.font = [UIFont systemFontOfSize:15];
label.textAlignment = NSTextAlignmentCenter;
[_backgroundView addSubview:label];
//標註 北 東 南 西
if (i%45 == 0){
tickText = array[i/45];
CGPoint point2 = [self calculateTextPositonWithArcCenter:CGPointMake(self.frame.size.width/2, self.frame.size.height/2)
Angle:textAngel andScale:0.8];
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(point2.x, point2.y, 30, 20)];
label.center = point2;
label.text = tickText;
label.textColor = [UIColor whiteColor];
label.font = [UIFont systemFontOfSize:20];
label.textAlignment = NSTextAlignmentCenter;
if ([tickText isEqualToString:@"北"]) {
UILabel * markLabel = [[UILabel alloc]initWithFrame:CGRectMake(point.x, point.y, 8, 8)];
markLabel.center = CGPointMake(point.x, point.y + 12);
markLabel.clipsToBounds = YES;
markLabel.layer.cornerRadius = 4;
markLabel.backgroundColor = [UIColor redColor];
[_backgroundView addSubview:markLabel];   
}
[_backgroundView addSubview:label];
}
}
} 
//畫十字線,參照線
UIView *  levelView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width/2/2, 1)];
levelView.center = CGPointMake(self.frame.size.width/2, self.frame.size.height/2);
levelView.backgroundColor = [UIColor whiteColor];
[self addSubview:levelView];
UIView *  verticalView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1, self.frame.size.width/2/2)];
verticalView.center = CGPointMake(self.frame.size.width/2, self.frame.size.height/2);
verticalView.backgroundColor = [UIColor whiteColor];
[self addSubview:verticalView];
UIView * lineView = [[UIView alloc] initWithFrame:CGRectMake(self.frame.size.width/2 -1.5, self.frame.size.height/2 - (self.frame.size.width/2 - 50) - 50, 3, 30 + 30)];
lineView.backgroundColor = [UIColor whiteColor];
[self addSubview:lineView];
}

2、利用CLLocationManager初始化定位裝置,並設置代理 ,記得在info.plist中加入隱私定位權限關鍵字 Privacy – Location When In Use Usage Description

  // 注意開啟手機的定位服務,隱私那裡的
self.locationManager = [[CLLocationManager alloc]init];
self.locationManager.delegate=self;
//  定位頻率,每隔多少米定位一次
// 距離過濾器,移動了幾米之後,才會觸發定位的代理函數
self.locationManager.distanceFilter = 0;
// 定位的精度,越精確,耗電量越高
self.locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;//導航
//請求允許在前臺獲取用戶位置的授權
[self.locationManager requestWhenInUseAuthorization];
//允許後臺定位更新,進入後臺後有藍條閃動
self.locationManager.allowsBackgroundLocationUpdates = YES;
//判斷定位設備是否能用和能否獲得導航數據
if ([CLLocationManager locationServicesEnabled]&&[CLLocationManager headingAvailable]){
[self.locationManager startUpdatingLocation];//開啟定位服務
[self.locationManager startUpdatingHeading];//開始獲得航向數據
}
else{
NSLog(@"不能獲得航向數據");
}

通過實現定位裝置的代理方法:
-(void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading 來獲得地理和地磁航向數據,從而轉動地理刻度表以及表上的文字標註;
方法-(BOOL)locationManagerShouldDisplayHeadingCalibration:(CLLocationManager *)manager返回Yes是為了受到外來磁場干擾時,設備會自動進行校驗。

#pragma mark - CLLocationManagerDelegate
//獲得地理和地磁航向數據,從而轉動地理刻度表
-(void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading{
//獲得當前設備
UIDevice *device =[UIDevice currentDevice];
//   判斷磁力計是否有效,負數時為無效,越小越精確
if (newHeading.headingAccuracy>0)
{
//地磁航向數據-》magneticHeading
float magneticHeading =[self heading:newHeading.magneticHeading fromOrirntation:device.orientation];
//地理航向數據-》trueHeading
float trueHeading =[self heading:newHeading.trueHeading fromOrirntation:device.orientation];
//地磁北方向
float heading = -1.0f *M_PI *newHeading.magneticHeading /180.0f;
_angleLabel.text = [NSString stringWithFormat:@"%3.1f°",magneticHeading];
//旋轉變換
[_scaView resetDirection:heading]; 
//返回當前手機(攝像頭)朝向方向
[self updateHeading:newHeading]; 
}
}
//判斷設備是否需要校驗,受到外來磁場干擾時
-(BOOL)locationManagerShouldDisplayHeadingCalibration:(CLLocationManager *)manager
{
return YES;
}
//旋轉重置刻度標誌的方向
- (void)resetDirection:(CGFloat)heading{
_backgroundView.transform = CGAffineTransformMakeRotation(heading);
for (UILabel * label in _backgroundView.subviews) {
label.transform = CGAffineTransformMakeRotation(-heading);
}
}

3、通過代理方法獲得經緯度以及海拔數據,然後利用經緯度進行地理反編碼獲得地理位置信息。

// 定位成功之後的回調方法,只要位置改變,就會調用這個方法
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
self.currLocation = [locations lastObject];
//維緯度
NSString * latitudeStr = [NSString stringWithFormat:@"%3.2f",
_currLocation.coordinate.latitude];
//經度
NSString * longitudeStr  = [NSString stringWithFormat:@"%3.2f",
_currLocation.coordinate.longitude];
//高度
NSString * altitudeStr  = [NSString stringWithFormat:@"%3.2f",
_currLocation.altitude];
NSLog(@"緯度 %@  經度 %@  高度 %@", latitudeStr, longitudeStr, altitudeStr);
_latitudlongitudeLabel.text = [NSString stringWithFormat:@"緯度:%@  經度:%@  海拔:%@", latitudeStr, longitudeStr, altitudeStr];
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
[geocoder reverseGeocodeLocation:self.currLocation
completionHandler:^(NSArray *placemarks, NSError *error) {
if ([placemarks count] > 0) {
CLPlacemark *placemark = placemarks[0];
NSDictionary *addressDictionary =  placemark.addressDictionary;
NSString *street = [addressDictionary
objectForKey:(NSString *)kABPersonAddressStreetKey];
street = street == nil ? @"": street;
NSString *country = placemark.country;
NSString * subLocality = placemark.subLocality;
NSString *city = [addressDictionary
objectForKey:(NSString *)kABPersonAddressCityKey];
city = city == nil ? @"": city;
NSLog(@"%@",[NSString stringWithFormat:@"%@ \n%@ \n%@  %@ ",country, city,subLocality ,street]);
_positionLabel.text = [NSString stringWithFormat:@" %@\n %@ %@%@ " ,country, city,subLocality ,street];
}
}];
}

iOS仿系統指南針

示例Github:iOS 仿系統指南針

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iOS仿系統指南針

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iOS仿系統指南針

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