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我的應用程序具有帶有帶有mapview和UITableViewController（SecondViewController-稱爲tableVC）的UIViewController（FirstViewController-稱爲mapVC）的tabbarcontroller。該應用程序從Web獲取數據並將其放入CD-db，每個VC執行一次對數據庫的提取。每個實體都被命名爲假日（不要問），它有一個lat和long屬性。如何將MapViewController作爲Datasource設置爲TableViewController以顯示單元格中的距離
這裏是的UITabBarController子類，可以嘗試設置mapVC作爲數據源，以tableVC：
- (void)viewDidLoad{
[super viewDidLoad];
// Do any additional setup after loading the view.
FirstViewController *mapVC;
SecondViewController *tableVC;
for(UIViewController *anyVC in self.viewControllers)
{
if([anyVC.class isKindOfClass:[SecondViewController class]]){
tableVC = (SecondViewController *)anyVC;
} else if ([anyVC.class isKindOfClass:[FirstViewController class]]){
mapVC = (FirstViewController *)anyVC;
}
}
tableVC.tableView.dataSource = mapVC;
tableVC.tableView.delegate = mapVC;
}
這裏是mapVC的相關部分：
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
#import "SecondViewController.h"
#define METERS_PER_MILE 2609.344
@interface FirstViewController : UIViewController <MKMapViewDelegate, UITableViewDataSource, UITableViewDelegate>{
BOOL _doneInitialZoom;
}
@property (strong, nonatomic) IBOutlet MKMapView *_mapView;
@property (strong, nonatomic) IBOutlet UIBarButtonItem *refreshButton;
@property (nonatomic, strong) NSString *entityName;
@property (strong, nonatomic) CLLocation *userLocation;
- (IBAction)refreshTapped:(id)sender;
-(void)showDetailView;
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
@end
及其實施：
#import "FirstViewController.h"
#import "Holiday.h"
#import "MyLocation.h"
#import "SDCoreDataController.h"
#import "MyTabBarController.h"
#import "TableViewCell.h"
- (void)loadRecordsFromCoreData {
[self.managedObjectContext performBlockAndWait:^{
[self.managedObjectContext reset];
NSError *error = nil;
NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:self.entityName];
[request setSortDescriptors:[NSArray arrayWithObject:
[NSSortDescriptor sortDescriptorWithKey:@"date" ascending:YES]]];
self.farSiman = [self.managedObjectContext executeFetchRequest:request error:&error];
}];
NSLog(@"self.farSiman on launch = %@", self.farSiman);
}
- (void)plotStorePositions:(NSString *)responseString {
for (id<MKAnnotation> annotation in _mapView.annotations) {
[_mapView removeAnnotation:annotation];
}
NSLog(@"Dictionary is %@", self.farSiman);
for (Holiday * holidayObject in self.farSiman) {
NSString * latitude = holidayObject.latitude;
NSString * longitude = holidayObject.longitude;
NSString * storeDescription = holidayObject.name;
NSString * address = holidayObject.address;
CLLocationCoordinate2D coordinate;
coordinate.latitude = latitude.doubleValue;
coordinate.longitude = longitude.doubleValue;
MyLocation *annotation = [[MyLocation alloc] initWithName:storeDescription address:address coordinate:coordinate distance:0];
//
CLLocation *pinLocation = [[CLLocation alloc] initWithLatitude:annotation.coordinate.latitude longitude:annotation.coordinate.longitude];
//[(MyLocation*)[view annotation] coordinate].latitude longitude:[(MyLocation*)[view annotation] coordinate].longitude]];
self.userLocation = [[CLLocation alloc] initWithLatitude:self._mapView.userLocation.coordinate.latitude longitude:self._mapView.userLocation.coordinate.longitude];
NSLog(@"PLOT>>userLocation is %@", userLocation);
CLLocationDistance calculatedDistance = [pinLocation distanceFromLocation:self.userLocation];
annotation.distance = calculatedDistance/1000;
NSLog(@"PLOT>>Distance to pin %4.0f", annotation.distance);
//
[_mapView addAnnotation:annotation];
}
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return [self.farSiman count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
TableViewCell *cell = nil;
// Check to see whether the normal table or search results table is being displayed and set the Candy object from the appropriate array
NSLog(@"Already in CFRAIP");
static NSString *CellIdentifier = @"HolidayCell";
if (cell == nil) {
cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
//cell.accessoryType=UITableViewCellAccessoryDetailDisclosureButton;
}
cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
Holiday *holiday = [self.farSiman objectAtIndex:indexPath.row];
cell.nameLabel.text = holiday.name;
//cell.dateLabel.text = holiday.latitude;
cell.dateLabel.text = [[self calculateDistanceForLat:[holiday.latitude doubleValue] Long:[holiday.longitude doubleValue]] stringValue];
if (holiday.image != nil) {
UIImage *image = [UIImage imageWithData:holiday.image];
cell.imageView.image = image;
} else {
cell.imageView.image = nil;
}
return cell;
}
// Add new method above refreshTapped
- (NSNumber*)calculateDistanceForLat:(double)lati Long:(double)longi {
double distancia;
CLLocation *pinLocation = [[CLLocation alloc] initWithLatitude:lati longitude:longi];
CLLocationDistance calculatedDistance = [pinLocation distanceFromLocation:self.userLocation];
//test locations
NSLog(@"pinLocations is %@, userLocation is %@", pinLocation, self.userLocation);
distancia = calculatedDistance/1000;
return [NSNumber numberWithDouble:distancia];
}
plotStoreLocations方法是UIButton中唯一的方法調用mapVC工具欄。
至於tableVC（SecondViewController）
#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
@interface SecondViewController : UITableViewController <UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate, UISearchDisplayDelegate>
@property (nonatomic, strong) NSArray *dates;
@property (nonatomic, strong) NSString *entityName;
@property (strong, nonatomic) IBOutlet UIBarButtonItem *refreshButton;
@property (strong,nonatomic) NSMutableArray *filteredResultsArray;
@property (strong,nonatomic) IBOutlet UISearchBar *resultsSearchBar;
@property (strong, nonatomic) CLLocation *userLocation;
- (IBAction)refreshButtonTouched:(id)sender;
及其實施：
- (void)loadRecordsFromCoreData {
[self.managedObjectContext performBlockAndWait:^{
[self.managedObjectContext reset];
NSError *error = nil;
NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:self.entityName];
[request setSortDescriptors:[NSArray arrayWithObject:
[NSSortDescriptor sortDescriptorWithKey:@"date" ascending:YES]]];
self.dates = [self.managedObjectContext executeFetchRequest:request error:&error];
NSLog(@"self.dates==%@",self.dates);
}];
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
if (tableView == self.searchDisplayController.searchResultsTableView) {
return [filteredResultsArray count];
} else {
return [self.dates count];
}
//return [self.dates count];
}
// Add new method above refreshTapped
- (NSNumber*)calculateDistanceForLat:(double)lati Long:(double)longi {
double distancia;
CLLocation *pinLocation = [[CLLocation alloc] initWithLatitude:lati longitude:longi];
CLLocationDistance calculatedDistance = [pinLocation distanceFromLocation:self.userLocation];
//test locations
NSLog(@"pinLocations is %@, userLocation is %@", pinLocation, self.userLocation);
distancia = calculatedDistance/1000;
return [NSNumber numberWithDouble:distancia];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
TableViewCell *cell = nil;
if (tableView == self.searchDisplayController.searchResultsTableView) {
static NSString *CellIdentifier = @"HolidayCell";
if (cell == nil) {
cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
Holiday *holiday = [filteredResultsArray objectAtIndex:indexPath.row];
NSLog(@"the holiday is %@", holiday.name);
cell.nameLabel.text = holiday.name;
} else {
static NSString *CellIdentifier = @"HolidayCell";
if (cell == nil) {
cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
Holiday *holiday = [self.dates objectAtIndex:indexPath.row];
cell.nameLabel.text = holiday.name;
cell.dateLabel.text = [[self calculateDistanceForLat:[holiday.latitude doubleValue] Long:[holiday.longitude doubleValue]] stringValue];
if (holiday.image != nil) {
UIImage *image = [UIImage imageWithData:holiday.image];
cell.imageView.image = image;
} else {
cell.imageView.image = nil;
}
}
return cell;
}
最後MyLocation：
import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
@interface MyLocation : NSObject <MKAnnotation> {
NSString *_name;
NSString *_address;
CLLocationCoordinate2D _coordinate;
}
@property (copy) NSString *name;
@property (copy) NSString *address;
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (assign) float distance;
- (id)initWithName:(NSString*)name address:(NSString*)address coordinate:(CLLocationCoordinate2D)coordinate distance:(float)distance;
@end
#import "MyLocation.h"
@implementation MyLocation
@synthesize name = _name;
@synthesize address = _address;
@synthesize coordinate = _coordinate;
@synthesize distance = _distance;
- (id)initWithName:(NSString*)name address:(NSString*)address coordinate:(CLLocationCoordinate2D)coordinate distance:(float)distance{
if ((self = [super init])) {
_name = [name copy];
_address = [address copy];
_coordinate = coordinate;
_distance = distance;
}
return self;
}
- (NSString *)title {
if ([_name isKindOfClass:[NSNull class]])
return @"Unknown charge";
else
return _name;
}
- (NSString *)subtitle {
return [NSString stringWithFormat:@"A %0.2f Kms", _distance];
//return _address;
}
具體的問題：
1）如果我加入mapVC（新數據源）中的cFRAIP（noris & nosit）方法是否需要將其從tableVC中移除？ 2）如果我從tableVC刪除cFRAIP和其他2（noris和nosit）方法，它會因爲沒有數據源而崩潰。所以數據源的tabbarcontroller分配似乎沒有工作。 3）最後，如果我不得不從tableVC中刪除cFRAIP，我將失去使用UISearchBar tableview的能力。或者我錯了？
當我運行應用程序時，mapVC是所選的vc。調用mapVC中plotStoreLocations的工具欄中的UIButton會變灰，直到Web抓取完成。此時控制檯會記錄作爲假日實體的self.farsiman位置。我可以看到所有的實體登錄到控制檯。
當我單擊繪圖按鈕時，userLocation按照plotStorePositions中指定的正確記錄，並且每個註釋的距離值都是正確的。所以每個MKAnnotation的距離都可以正確計算。
當我切換到tableVC選項卡，新self.dates陣列被記錄在控制檯（因爲我目前擁有的tableVC做另一張CD-DB獲取和我得到這個每個引腳的位置：
已經在CFRAIP pinLocations是< + 15.50288611，-88.02716389> +/- 0.00m（速度-1.00 mps /當然-1.00）@ 1/24/13，8:20:39 PM Central Standard Time，userLocation是（ null）
它是由CFRAIP調用的calculateDistanceForLat調用的。細胞細節中的每個距離都是-0.001。
我可能會誤導你開始一個新的問題。我認爲你的委託和數據源正在工作，你想要的只是幫助cFRAIP，以便每個單元顯示正確的MyLocation的數據。 – Craig