我想从iPhone获取GPS坐标并将这些GPS坐标发送到Web服务。该网络服务将获取我的GPS坐标，并向我发送当前位置最近的ATM的位置。
现在我想分两个阶段进行。
第一阶段，我只想将GPS坐标发送到Web服务，作为回报，我想要ATM位置的地址。
第二阶段，我想将此ATM指向iPhone应用程序中显示的MAP。
我开发了Web服务，它接受2个输入参数：lat和longi。
并以字符串格式向我返回ATM位置的地址。
从第一阶段开始：请帮助我获取GPS坐标并将其发送到Web服务。
这样我就可以在视图上以字符串格式（从Web服务获取结果）显示地址。
最佳答案
苹果提供的示例代码（编辑：链接已移动）：https://developer.apple.com/library/content/samplecode/LocateMe/
您必须征得用户许可，然后将此属性添加到您的plist中：NSLocationWhenInUseUsageDescription
然后，基本上是苹果在viewController中的工作方式（从上面的链接复制）：
/*
Copyright (C) 2014 Apple Inc. All Rights Reserved.
See LICENSE.txt for this sample’s licensing information
*/
#import "GetLocationViewController.h"
#import "LocationDetailViewController.h"
#import "SetupViewController.h"
#import "CLLocation+Strings.h"
@interface GetLocationViewController () <SetupViewControllerDelegate, CLLocationManagerDelegate>
@property (nonatomic, weak) IBOutlet UIButton *startButton;
@property (nonatomic, weak) IBOutlet UILabel *descriptionLabel;
@property (nonatomic, weak) IBOutlet UITableView *tableView;
@property (nonatomic, strong) SetupViewController* setupViewController;
@property (nonatomic, copy) NSString *stateString;
@property (nonatomic, strong) CLLocationManager *locationManager;
@property (nonatomic, strong) NSDateFormatter *dateFormatter;
@property (nonatomic, strong) NSMutableArray *locationMeasurements;
@property (nonatomic, strong) CLLocation *bestEffortAtLocation;
@end
#pragma mark -
@implementation GetLocationViewController
- (void)viewDidLoad {
[super viewDidLoad];
_locationMeasurements = [NSMutableArray array];
}
- (NSDateFormatter *)dateFormatter {
if (_dateFormatter == nil) {
_dateFormatter = [[NSDateFormatter alloc] init];
[_dateFormatter setDateStyle:NSDateFormatterMediumStyle];
[_dateFormatter setTimeStyle:NSDateFormatterLongStyle];
}
return _dateFormatter;
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
UINavigationController *nv = segue.destinationViewController;
_setupViewController = nv.viewControllers[0];
self.setupViewController.delegate = self;
}
#pragma mark - Actions
// The reset method allows the user to repeatedly test the location functionality.
// In addition to discarding all of the location measurements from the previous "run",
// it animates a transition in the user interface between the table which displays location
// data and the start button and description label presented at launch.
//
- (void)reset {
_bestEffortAtLocation = nil;
[self.locationMeasurements removeAllObjects];
// fade in the rest of the UI and fade out the table view
[UIView animateWithDuration:0.6f animations:^(void) {
self.startButton.alpha = 1.0;
self.descriptionLabel.alpha = 1.0;
self.tableView.alpha = 0.0;
[self.navigationItem setLeftBarButtonItem:nil animated:YES];
} completion:^(BOOL finished) {
if (finished) {
//..
}
}];
}
#pragma mark - Location Manager Interactions
// This method is invoked when the user hits "Done" in the setup view controller.
// The options chosen by the user are passed in as a dictionary. The keys for this dictionary
// are declared in SetupViewController.h.
//
- (void)setupViewController:(SetupViewController *)controller didFinishSetupWithInfo:(NSDictionary *)setupInfo {
self.startButton.alpha = 0.0;
self.descriptionLabel.alpha = 0.0;
self.tableView.alpha = 1.0;
// Create the core location manager object
_locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
// This is the most important property to set for the manager. It ultimately determines how the manager will
// attempt to acquire location and thus, the amount of power that will be consumed.
self.locationManager.desiredAccuracy = [setupInfo[kSetupInfoKeyAccuracy] doubleValue];
// Once configured, the location manager must be "started"
//
// for iOS 8, specific user level permission is required,
// "when-in-use" authorization grants access to the user's location
//
// important: be sure to include NSLocationWhenInUseUsageDescription along with its
// explanation string in your Info.plist or startUpdatingLocation will not work.
//
if ([self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
[self.locationManager requestWhenInUseAuthorization];
}
[self.locationManager startUpdatingLocation];
[self performSelector:@selector(stopUpdatingLocationWithMessage:)
withObject:@"Timed Out"
afterDelay:[setupInfo[kSetupInfoKeyTimeout] doubleValue]];
self.stateString = NSLocalizedString(@"Updating", @"Updating");
[self.tableView reloadData];
}
// We want to get and store a location measurement that meets the desired accuracy.
// For this example, we are going to use horizontal accuracy as the deciding factor.
// In other cases, you may wish to use vertical accuracy, or both together.
//
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
// store all of the measurements, just so we can see what kind of data we might receive
[self.locationMeasurements addObject:newLocation];
// test the age of the location measurement to determine if the measurement is cached
// in most cases you will not want to rely on cached measurements
//
NSTimeInterval locationAge = -[newLocation.timestamp timeIntervalSinceNow];
if (locationAge > 5.0) {
return;
}
// test that the horizontal accuracy does not indicate an invalid measurement
if (newLocation.horizontalAccuracy < 0) {
return;
}
// test the measurement to see if it is more accurate than the previous measurement
if (self.bestEffortAtLocation == nil || self.bestEffortAtLocation.horizontalAccuracy > newLocation.horizontalAccuracy) {
// store the location as the "best effort"
_bestEffortAtLocation = newLocation;
// test the measurement to see if it meets the desired accuracy
//
// IMPORTANT!!! kCLLocationAccuracyBest should not be used for comparison with location coordinate or altitidue
// accuracy because it is a negative value. Instead, compare against some predetermined "real" measure of
// acceptable accuracy, or depend on the timeout to stop updating. This sample depends on the timeout.
//
if (newLocation.horizontalAccuracy <= self.locationManager.desiredAccuracy) {
// we have a measurement that meets our requirements, so we can stop updating the location
//
// IMPORTANT!!! Minimize power usage by stopping the location manager as soon as possible.
//
[self stopUpdatingLocationWithMessage:NSLocalizedString(@"Acquired Location", @"Acquired Location")];
// we can also cancel our previous performSelector:withObject:afterDelay: - it's no longer necessary
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(stopUpdatingLocationWithMessage:) object:nil];
}
}
// update the display with the new location data
[self.tableView reloadData];
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
// The location "unknown" error simply means the manager is currently unable to get the location.
// We can ignore this error for the scenario of getting a single location fix, because we already have a
// timeout that will stop the location manager to save power.
//
if ([error code] != kCLErrorLocationUnknown) {
[self stopUpdatingLocationWithMessage:NSLocalizedString(@"Error", @"Error")];
}
}
- (void)stopUpdatingLocationWithMessage:(NSString *)state {
self.stateString = state;
[self.tableView reloadData];
[self.locationManager stopUpdatingLocation];
self.locationManager.delegate = nil;
UIBarButtonItem *resetItem = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Reset", @"Reset")
style:UIBarButtonItemStylePlain
target:self
action:@selector(reset)];
[self.navigationItem setLeftBarButtonItem:resetItem animated:YES];
}
#pragma mark - UITableViewDataSource
// The table view has three sections. The first has 1 row which displays status information.
// The second has 1 row which displays the most accurate valid location measurement received.
// The third has a row for each valid location object received
// (including the one displayed in the second section) from the location manager.
//
- (NSInteger)numberOfSectionsInTableView:(UITableView *)table {
return (self.bestEffortAtLocation != nil) ? 3 : 1;
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
NSString *headerTitle = nil;
switch (section) {
case 0: {
headerTitle = NSLocalizedString(@"Status", @"Status");
break;
}
case 1: {
headerTitle = NSLocalizedString(@"Best Measurement", @"Best Measurement");
break;
}
default: {
headerTitle = NSLocalizedString(@"All Measurements", @"All Measurements");
break;
}
}
return headerTitle;
}
- (NSInteger)tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section {
NSInteger numRows = 0;
switch (section) {
case 0: {
numRows = 1;
break;
}
case 1: {
numRows = 1;
break;
}
default: {
numRows = self.locationMeasurements.count;
break;
}
}
return numRows;
}
- (UITableViewCell *)tableView:(UITableView *)table cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = nil;
switch (indexPath.section) {
case 0: {
// The cell for the status row uses the cell style "UITableViewCellStyleValue1", which has a label on the left side of the cell with left-aligned and black text; on the right side is a label that has smaller blue text and is right-aligned. An activity indicator has been added to the cell and is animated while the location manager is updating. The cell's text label displays the current state of the manager.
static NSString * const kStatusCellID = @"StatusCellID";
static NSInteger const kStatusCellActivityIndicatorTag = 2;
UIActivityIndicatorView *activityIndicator = nil;
cell = [table dequeueReusableCellWithIdentifier:kStatusCellID];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:kStatusCellID];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
CGRect frame = activityIndicator.frame;
frame.origin = CGPointMake(290.0, 12.0);
activityIndicator.frame = frame;
activityIndicator.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;
activityIndicator.tag = kStatusCellActivityIndicatorTag;
[cell.contentView addSubview:activityIndicator];
} else {
activityIndicator = (UIActivityIndicatorView *)[cell.contentView viewWithTag:kStatusCellActivityIndicatorTag];
}
cell.textLabel.text = self.stateString;
if ([self.stateString isEqualToString:NSLocalizedString(@"Updating", @"Updating")]) {
if (activityIndicator.isAnimating == NO) {
[activityIndicator startAnimating];
}
} else {
if (activityIndicator.isAnimating) {
[activityIndicator stopAnimating];
}
}
break;
}
case 1: {
// The cells for the location rows use the cell style "UITableViewCellStyleSubtitle", which has a left-aligned label across the top and a left-aligned label below it in smaller gray text. The text label shows the coordinates for the location and the detail text label shows its timestamp.
static NSString * const kBestMeasurementCellID = @"BestMeasurementCellID";
cell = [table dequeueReusableCellWithIdentifier:kBestMeasurementCellID];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:kBestMeasurementCellID];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
cell.textLabel.text = self.bestEffortAtLocation.localizedCoordinateString;
cell.detailTextLabel.text = [self.dateFormatter stringFromDate:self.bestEffortAtLocation.timestamp];
break;
}
default: {
// The cells for the location rows use the cell style "UITableViewCellStyleSubtitle", which has a left-aligned label across the top and a left-aligned label below it in smaller gray text. The text label shows the coordinates for the location and the detail text label shows its timestamp.
static NSString * const kOtherMeasurementsCellID = @"OtherMeasurementsCellID";
cell = [table dequeueReusableCellWithIdentifier:kOtherMeasurementsCellID];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:kOtherMeasurementsCellID];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
CLLocation *location = self.locationMeasurements[indexPath.row];
cell.textLabel.text = location.localizedCoordinateString;
cell.detailTextLabel.text = [self.dateFormatter stringFromDate:location.timestamp];
break;
}
}
return cell;
}
#pragma mark - UITableViewDelegate
// Delegate method invoked before the user selects a row.
// In this sample, we use it to prevent selection in the first section of the table view.
//
- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath {
return (indexPath.section == 0) ? nil : indexPath;
}
// Delegate method invoked after the user selects a row. Selecting a row containing a location object
// will navigate to a new view controller displaying details about that location.
//
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[self.tableView deselectRowAtIndexPath:indexPath animated:YES];
CLLocation *location = self.locationMeasurements[indexPath.row];
LocationDetailViewController *detailVC = [[LocationDetailViewController alloc] initWithStyle:UITableViewStyleGrouped];
detailVC.location = location;
[self.navigationController pushViewController:detailVC animated:YES];
}
@end
关于iphone - 如何使用Objective C在iPhone中获取GPS坐标，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/1789519/