这里我有两个观点:
- WallViewController
- TableViewController
WallViewController 包含 MKMapView，TableViewController 是 PFQueryTableViewController 的子类，显示与 墙 View Controller 。 TableViewController 作为 subview 添加到 WallViewController 中，因此这两个 View 一起显示。 现在，当我点击 map 上的注释针时， 中的 TableView TableViewController 将滚动到与成功选择的注释 pin 相关联的行。 但我想做的是也有一个相反的 Action ，所以当我点击一行时，与该行关联的注释图钉将被选中，并且它的标注也会被显示。
下面我提供了相关代码:
WallViewController.h
@interface WallViewController : UIViewController <MKMapViewDelegate, CLLocationManagerDelegate>
@property (nonatomic, strong) IBOutlet MKMapView *mapView;
@end
@protocol WallViewControllerHighlight <NSObject>
- (void)highlightCellForPost:(PAWPost *)post;
- (void)unhighlightCellForPost:(PAWPost *)post;
@end
WallViewController.m
- (void)viewDidLoad {
[super viewDidLoad];
self.tableViewController = [[TableViewController alloc] initWithStyle:UITableViewStylePlain];
[self addChildViewController:self.tableViewController];
self.tableViewController.view.frame = CGRectMake(6.0f, 215.0f, 308.0f, self.view.bounds.size.height - 215.0f);
[self.view addSubview:self.tableViewController.view];
self.wallPostsTableViewController.wallViewController = self;
....
}
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view {
id<MKAnnotation> annotation = [view annotation];
if ([annotation isKindOfClass:[PAWPost class]]) {
PAWPost *post = [view annotation];
[PostsTableViewController highlightCellForPost:post];
} else if ([annotation isKindOfClass:[MKUserLocation class]]) {
// Center the map on the user's current location:
AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
MKCoordinateRegion newRegion = MKCoordinateRegionMakeWithDistance(appDelegate.currentLocation.coordinate, appDelegate.filterDistance * 2, appDelegate.filterDistance * 2);
[self.mapView setRegion:newRegion animated:YES];
self.mapPannedSinceLocationUpdate = NO;
}
}
TableViewController.h
@interface TableViewController : PFQueryTableViewController <WallViewControllerHighlight>
@property (nonatomic, strong) PAWWallViewController *wallViewController;
- (void)highlightCellForPost:(PAWPost *)post;
- (void)unhighlightCellForPost:(PAWPost *)post;
@end
TableViewController.m
....
@synthesize wallViewController;
....
- (void)highlightCellForPost:(PAWPost *)post {
// Find the cell matching this object.
for (PFObject *object in [self objects]) {
PAWPost *postFromObject = [[PAWPost alloc] initWithPFObject:object];
if ([post equalToPost:postFromObject]) {
// We found the object, scroll to the cell position where this object is.
NSUInteger index = [[self objects] indexOfObject:object];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:index inSection:kTableViewMainSection];
[self.tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
[self.tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionNone];
return;
}
}
// Don't scroll for posts outside the search radius.
if ([post.title compare:kWallCantViewPost] != NSOrderedSame) {
// We couldn't find the post, so scroll down to the load more cell.
NSUInteger rows = [self.tableView numberOfRowsInSection:kTableViewMainSection];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:(rows - 1) inSection:kTableViewMainSection];
[self.tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];
[self.tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionNone];
[self.tableView deselectRowAtIndexPath:indexPath animated:YES];
}
}
- (void)unhighlightCellForPost:(PAWPost *)post {
// Deselect the post's row.
for (PFObject *object in [self objects]) {
PAWPost *postFromObject = [[PAWPost alloc] initWithPFObject:object];
if ([post equalToPost:postFromObject]) {
NSUInteger index = [[self objects] indexOfObject:object];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:index inSection:0];
[self.tableView deselectRowAtIndexPath:indexPath animated:YES];
return;
}
}
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// call super because we're a custom subclass.
[super tableView:tableView didSelectRowAtIndexPath:indexPath];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
// highlight annotation pin on map - my problem is here ????
NSLog(@"tap row --> %i", indexPath.row); //******1*****
NSLog(@"annotation count --> %i", [self.objects count]); //*****2*****
UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];
UILabel *textLabel = (UILabel*) [selectedCell.contentView viewWithTag:kPAWCellTextLabelTag];
NSLog(@"textlabel at the table row tapped --> %@", textLabel.text); //*****3*****
for (NSInteger i = 0; i < [self.objects count]; i++) {
PFObject *object = [self.objects objectAtIndex:i];
PAWPost *postFromObject = [[PAWPost alloc] initWithPFObject:object];
NSString *text = postFromObject.title;
NSLog(@"text retrieved from PAWPost --> %@", text); //*****4*****
if ([text isEqualToString:textLabel.text]) {
NSLog(@"found matching at %i", i); //*****5*****
[wallViewController.mapView selectAnnotation:[[wallViewController.mapView annotations] objectAtIndex:i] animated:YES];
NSLog(@"wallViewController --> %@", wallViewController); //*****6*****
NSLog(@"wallViewController mapView --> %@", wallViewController.mapView); //*****7*****
}
}
}
我的问题出在 TableViewController.m 中的最后一个方法 (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 中。现在我有了你看到的代码，使用:
[wallViewController.mapView selectAnnotation:[[wallViewController.mapView annotations] objectAtIndex:i] animated:YES];
但是好像不行。这里一定有问题，但我不知道它是什么。
点击表格的第一行后，我在这里提供了我的日志输出:
2015-01-28 11:24:31.886 Test[8097:60b] tap row --> 0
2015-01-28 11:24:31.888 Test[8097:60b] annotation count --> 40
2015-01-28 11:24:31.890 Test[8097:60b] textlabel at the table row tapped --> Asddsdtest
2015-01-28 11:24:31.890 Test[8097:60b] text retrieved from PAWPost --> ...(40 texts here)
2015-01-28 11:24:31.897 Test[8097:60b] found matching at 0
2015-01-28 11:24:31.899 Test[8097:60b] wallViewController --> (null)
2015-01-28 11:24:31.900 Test[8097:60b] wallViewController mapView --> (null)
附言我找到了 this question但答案和评论似乎没有为像我这样的初学者提供足够的细节。
添加了附加信息
PAWPost.h
@interface PAWPost : NSObject <MKAnnotation>
//@protocol MKAnnotation <NSObject>
// Center latitude and longitude of the annotion view.
// The implementation of this property must be KVO compliant.
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
// @optional
// Title and subtitle for use by selection UI.
@property (nonatomic, readonly, copy) NSString *title;
@property (nonatomic, readonly, copy) NSString *subtitle;
// @end
// Other properties:
@property (nonatomic, readonly, strong) PFObject *object;
@property (nonatomic, readonly, strong) PFGeoPoint *geopoint;
@property (nonatomic, readonly, strong) PFUser *user;
@property (nonatomic, assign) BOOL animatesDrop;
@property (nonatomic, readonly) MKPinAnnotationColor pinColor;
// Designated initializer.
- (id)initWithCoordinate:(CLLocationCoordinate2D)coordinate andTitle:(NSString *)title andSubtitle:(NSString *)subtitle;
- (id)initWithPFObject:(PFObject *)object;
- (BOOL)equalToPost:(PAWPost *)aPost;
- (void)setTitleAndSubtitleOutsideDistance:(BOOL)outside;
@end
PAWPost.m
@interface PAWPost ()
// Redefine these properties to make them read/write for internal class accesses and mutations.
@property (nonatomic, assign) CLLocationCoordinate2D coordinate;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *subtitle;
@property (nonatomic, strong) PFObject *object;
@property (nonatomic, strong) PFGeoPoint *geopoint;
@property (nonatomic, strong) PFUser *user;
@property (nonatomic, assign) MKPinAnnotationColor pinColor;
@end
@implementation PAWPost
- (id)initWithCoordinate:(CLLocationCoordinate2D)aCoordinate andTitle:(NSString *)aTitle andSubtitle:(NSString *)aSubtitle {
self = [super init];
if (self) {
self.coordinate = aCoordinate;
self.title = aTitle;
self.subtitle = aSubtitle;
self.animatesDrop = NO;
}
return self;
}
- (id)initWithPFObject:(PFObject *)anObject {
self.object = anObject;
self.geopoint = [anObject objectForKey:kPAWParseLocationKey];
self.user = [anObject objectForKey:kPAWParseUserKey];
[anObject fetchIfNeeded];
CLLocationCoordinate2D aCoordinate = CLLocationCoordinate2DMake(self.geopoint.latitude, self.geopoint.longitude);
NSString *aTitle = [anObject objectForKey:kPAWParseTextKey];
NSString *aSubtitle = [[anObject objectForKey:kPAWParseUserKey] objectForKey:kPAWParseUsernameKey];
return [self initWithCoordinate:aCoordinate andTitle:aTitle andSubtitle:aSubtitle];
}
- (BOOL)equalToPost:(PAWPost *)aPost {
if (aPost == nil) {
return NO;
}
if (aPost.object && self.object) {
// We have a PFObject inside the PAWPost, use that instead.
if ([aPost.object.objectId compare:self.object.objectId] != NSOrderedSame) {
return NO;
}
return YES;
} else {
// Fallback code:
if ([aPost.title compare:self.title] != NSOrderedSame ||
[aPost.subtitle compare:self.subtitle] != NSOrderedSame ||
aPost.coordinate.latitude != self.coordinate.latitude ||
aPost.coordinate.longitude != self.coordinate.longitude ) {
return NO;
}
return YES;
}
}
- (void)setTitleAndSubtitleOutsideDistance:(BOOL)outside {
if (outside) {
self.subtitle = nil;
self.title = kPAWWallCantViewPost;
self.pinColor = MKPinAnnotationColorRed;
} else {
self.title = [self.object objectForKey:kPAWParseTextKey];
//self.subtitle = [[self.object objectForKey:kPAWParseUserKey] objectForKey:kPAWParseUsernameKey];
self.subtitle = [NSString stringWithFormat:@"@%@",[[self.object objectForKey:kPAWParseUserKey] objectForKey:kPAWParseUsernameKey]];
self.pinColor = MKPinAnnotationColorGreen;
}
}
@end
最佳答案
您可以使用 PFObject.objectId 来查找您想要的注释。
PFObject *selectedObject = [self.objects objectAtIndex:i];
for (id annotation in wallViewController.mapView.annotations)
{
if ([annotation isKindOfClass:[PAWPost class]])
{
PAWPost *post = (PAWPost*)annotation;
if ([post.object.objectId isEqualToString:selectedObject.objectId])
{
[wallViewController.mapView selectAnnotation:annotation animated:YES];
break;
}
}
}
关于ios - 点击与之关联的表格行时如何选择 map 图钉？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28144466/