EDITED：MapKit注释标注。调整UIPopoverController的大小

Question

对不起，我已经阅读了一堆教程如何为MapKit注释创建自定义标注。它适用于NSLog，但我无法在标注中显示信息。

我在地图上有两种类型的图标。这是我的viewForAnnotation方法：

-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation { 

    if (! [annotation isKindOfClass:[IGAMapAnnotation class]]) { 
     return nil; 
    } 

    IGAMapAnnotation *myLocation = (IGAMapAnnotation *) annotation; 

    self.typeIsFix = [myLocation.navaidType isEqualToString:@"FIX"]; 
    self.typeIsPort = [myLocation.navaidType isEqualToString:@"PORT"]; 

    int planeImageViewTag = 42; 

    NSString *reuseId; 

    if (self.typeIsPort) 
     reuseId = @"IGAMapAnnotationPort"; 

    else if (self.typeIsFix) 
     reuseId = @"IGAMapAnnotationFix"; 

    else 
     reuseId = @"IGAMapAnnotationOther"; 


    MKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:reuseId]; 

    if (annotationView == nil) 
    { 
     annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:reuseId]; 
     annotationView.enabled = YES; 

     UIButton *annotationInfo = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; 
     annotationView.rightCalloutAccessoryView = annotationInfo; 
     annotationView.canShowCallout = YES; 


     if (self.typeIsPort) 
     { 
      annotationView.image = [UIImage imageNamed:@"mapPORT.png"]; 
      annotationView.centerOffset = CGPointMake(0, 0); 

     } 

     else if (self.typeIsFix) 
     { 
      annotationView.image = [UIImage imageNamed:@"mapFIX.png"]; 
      annotationView.centerOffset = CGPointMake(0, 0); 

     } 

     else 
      return nil; 
    } 

    else 
    { 
     annotationView.annotation = annotation; 
    } 

    return annotationView; 
} 

然后，我有一个calloutAccessoryControlTapped方法

- (void)mapView:(MKMapView *)mapview annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control 
{ 
    IGAAnnotationInfoViewController *popOverCallout = [[IGAAnnotationInfoViewController alloc]init]; 

    UIPopoverController *popOver = [[UIPopoverController alloc] initWithContentViewController:popOverCallout]; 

    popOver.popoverContentSize = CGSizeMake(300, 200); 

    [popOver presentPopoverFromRect:view.bounds 
          inView:view 
      permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES]; 
} 

我也创建了我分配到UIPopoverController一个UIViewController。

现在，当我点击我的注释按钮时，我看到一个文本的空白区域。大。如果我将文本分配到的UIViewController一个标签，它也是伟大工程（以下是我的UIViewController.m）：

- (void)viewDidLoad { 
    [super viewDidLoad]; 

    txtCallout = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, 300, 200) ]; 
    txtCallout.font = [UIFont fontWithName:@"Arial Rounded MT Bold" size:(14.0)]; 
    txtCallout.numberOfLines = 0; 
    txtCallout.clipsToBounds = YES; 
    txtCallout.backgroundColor = [UIColor clearColor]; 
    txtCallout.textColor = [UIColor blackColor]; 
    txtCallout.textAlignment = NSTextAlignmentLeft; 
    txtCallout.text = @"text\ntext\ntext"; 
    [self.view addSubview:txtCallout]; 
} 

但是我怎么插入来自我的标注方法的文本？此外，文本必须根据图标类型而不同，例如@“PORT，PORT”或@“FIX，FIX”。我该怎么做？

编辑：

我设法显示标注与必要的信息传递。我的最后一个问题是，有时我的标注是3行，有时是 - 多达15行。怎样才能使标注自动调整到我的字符串中的行数？我应该在UIViewController中修改我的popoverContentSize或我的标签大小吗？

太谢谢你了！

Answer 1

我已经想出了如何将MK Annotation标注调整到UILabel。

@implementation IGAAnnotationInfoViewController 

@synthesize calloutInformation,txtCallout; 

-(IGAAnnotationInfoViewController*) initWithText : (NSString*) calloutText { 
    self = [super init]; 

    if (self) { 
     calloutInformation = calloutText; 

     // Creating a label that will display the callout information (passed from IGAAcarasViewController - Map Annotation) 
     txtCallout = [[IGACalloutLabel alloc] initWithFrame:CGRectMake(20, 20, 0, 0)]; 

     txtCallout.lineBreakMode = NSLineBreakByWordWrapping; 
     txtCallout.numberOfLines=0; 
     txtCallout.backgroundColor = [UIColor clearColor]; 
     txtCallout.textColor=[UIColor blueColor]; 
     txtCallout.text = calloutInformation; 
     [txtCallout drawTextInRect:CGRectMake(10,10,0,0)]; 

     [txtCallout sizeToFit]; 
     [self.view addSubview:txtCallout]; 
    } 

    return self; 
} 

最后落实calloutAccessoryControlTapped方法

- (void)mapView:(MKMapView *)mapview annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control 
{ 
    // OPTIONAL: Deselecting Annotation View when Callout is tapped 
    //[mapview deselectAnnotation:view.annotation animated:YES]; 

    NSString *calloutDetails; 

    IGAMapAnnotation *annotationTapped = (IGAMapAnnotation *)view.annotation; 

    calloutDetails = [NSString stringWithFormat:@"YOUR TEXT:\nYOURTEXT\n"]; 

    // Declare and initialize the UIViewController that has the label to contain the callout information 
    IGAAnnotationInfoViewController *detailViewController = [[IGAAnnotationInfoViewController alloc]initWithText:calloutDetails]; 

    UIPopoverController *popOver = [[UIPopoverController alloc] initWithContentViewController:detailViewController]; 

    // Size of the UIPopoverController = size of the label + 40 pts 
    popOver.popoverContentSize = CGSizeMake(detailViewController.txtCallout.frame.size.width+40,detailViewController.txtCallout.frame.size.height+40); 

    // Show popover controller 
    [popOver presentPopoverFromRect:view.bounds 
          inView:view 
      permittedArrowDirections:UIPopoverArrowDirectionAny 
          animated:YES]; 
} 

现在，IGAAnnotationInfoViewController.h

@interface IGAAnnotationInfoViewController : UIViewController { 
    CGRect calloutSize; 
} 

@property (strong,nonatomic) NSString *calloutInformation; 
@property (strong,nonatomic) IGACalloutLabel *txtCallout; 

-(IGAAnnotationInfoViewController*) initWithText : (NSString*) calloutText; 

IGAAnnotationInfoViewController.m，子类UILabel类：

implementation IGACalloutLabel 

@synthesize topInset, leftInset, bottomInset, rightInset; 

- (void)drawTextInRect:(CGRect)rect 
{ 
    UIEdgeInsets insets = {topInset,leftInset,bottomInset,rightInset}; 

    return [super drawTextInRect:UIEdgeInsetsInsetRect(rect, insets)]; 
} 

Regards，