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我是 iOS 编程新手，在视图控制器之间传递数据时遇到了麻烦。

我有一个视图控制器，它对地图视图上的注释进行地理编码，并将地址设置为注释视图的标题。注释视图有一个标注按钮，可将另一个视图推送到堆栈，该堆栈有一个标签，我希望地理编码的地址显示为标签。这是一些代码：

这是我放下别针的地方：

-(void)press:(UILongPressGestureRecognizer *)recognizer
{
    CGPoint touchPoint = [recognizer locationInView:worldView];
    CLLocationCoordinate2D touchMapCoordinate = [worldView convertPoint:touchPoint toCoordinateFromView:worldView];

    geocoder = [[CLGeocoder alloc]init];
    CLLocation *location = [[CLLocation alloc]initWithCoordinate:touchMapCoordinate
                                                    altitude:CLLocationDistanceMax
                                          horizontalAccuracy:kCLLocationAccuracyBest
                                            verticalAccuracy:kCLLocationAccuracyBest
                                                   timestamp:[NSDate date]];
    [geocoder reverseGeocodeLocation:location
                   completionHandler:^(NSArray *placemarks, NSError *error) {
                       NSLog(@"reverseGeocoder:completionHandler: called");
                       if (error) {
                          NSLog(@"Geocoder failed with error: %@", error);
                       }
                       if (placemarks && placemarks.count > 0)
                       {
                           CLPlacemark *place = [placemarks objectAtIndex:0];
                           _address = [NSString stringWithFormat:@"%@ %@, %@ %@", [place subThoroughfare], [place thoroughfare], [place locality], [place administrativeArea]];

                           if (UIGestureRecognizerStateBegan == [recognizer state]) {
                               _addressPin = [[MapPoint alloc]initWithCoordinate:touchMapCoordinate
                                                                        title:_address];
                           [worldView addAnnotation:_addressPin];
                       }
                   }
               }];
}

这是我希望显示地址的视图的代码：

#import <UIKit/UIKit.h>
@class MapPoint;

@interface PinViewController : UIViewController <UINavigationControllerDelegate,     UIImagePickerControllerDelegate,UITextFieldDelegate>

{
    __weak IBOutlet UILabel *addressLabel;
}

@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@property (strong, nonatomic) MapPoint *pin;

-(void)takePicture:(id)sender;
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;

@end

#import "PinViewController.h"
#import "MapPoint.h"

@interface PinViewController ()

@end

@implementation PinViewController

@synthesize imageView, pin;
-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    [addressLabel setText:[pin title]];

}

MapPoint 类具有 title 属性和 subtitle 属性。当 PinViewController 被推到堆栈顶部时，我尝试将标签的文本设置为引脚的标题，但标签不显示任何文本。有人可以帮助我并告诉我我错过了什么吗？非常感谢您的帮助。

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2 回答 2

2

您必须为此问题分享更多代码块:)。而不是你必须更多地了解面向对象程序中的通信

您可以在此处阅读有关在视图类之间传递数据的好教程

在此处阅读在两个视图之间传递对象的最佳方法

我在 Developer.apple 中找到了一个关于CommunicatingWithObjects的好文档

您也可以在这里观看精彩的视频

于 2012-10-17T06:12:08.753 回答
1

只需为标签创建属性并从标注点击方法传递标签文本

- (void)mapView:(MKMapView *)mapView annotationView:(MKPinAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {

    Details *det=[[Details alloc]init];
    det.label.text=annotation.title;
    [self.navigationController pushViewController:det animated:YES];
    [det release];
}
于 2012-10-17T06:29:50.920 回答