将UISegmentedControl值从Utility应用程序中的FlipSideViewController传递到mainviewcontroller ... [英] Passing UISegmentedControl values from FlipSideViewController in an Utility application to the mainviewcontroller…

问题描述

例如，如果flipsideviewcontroller中的segmentedcontrol发生变化，我希望Mainviewcontroller中的maptype从satellite变为hybrid？我究竟做错了什么？基本上，我希望mainviewcontroller对flipsideviewcontroller中所做的更改作出反应!!!

For example, I want the maptype in the Mainviewcontroller to change from satellite to hybrid if the segmentedcontrol in the flipsideviewcontroller changes? What am i doing wrong? Basically, I want the mainviewcontroller to react to the changes made in the flipsideviewcontroller!!!

FlipsideViewController.h

FlipsideViewController.h

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <MapKit/MKMapView.h>

@protocol FlipsideViewControllerDelegate;


@interface FlipsideViewController : UIViewController {
            id <FlipsideViewControllerDelegate> delegate;

        IBOutlet UISegmentedControl *mapType_;

    }

    @property (nonatomic, retain) UISegmentedControl *mapType_;

    @end

MainViewController.h

MainViewController.h

@interface MainViewController : UIViewController <XXXX> {
IBOutlet UISegmentedControl *mapType;
}

@property (nonatomic, retain) UISegmentedControl *mapType;

@end

MainViewController.m

MainViewController.m

  -(void)viewDidLoad {
        if(mapType.selectedSegmentIndex==0){
            mapView.mapType=MKMapTypeStandard;
        }

        else if (mapType.selectedSegmentIndex==1){
            mapView.mapType=MKMapTypeSatellite;
        }

        else if (mapType.selectedSegmentIndex==2) {
            mapView.mapType = MKMapTypeHybrid;
        }
    }

有关如何实现这一目标的任何想法？我究竟做错了什么？非常感谢答案！谢谢！

Any ideas of how to make this possible? What am i doing wrong? Would really appreciate an answer! Thanks!

如何实现委托方法（正如phix23所回答的那样）......？

How do I implement the delegate method (as phix23 answered)...?

推荐答案

（1）通过这种新方法扩展 FlipsideViewControllerDelegate 协议：

(1) Extend theFlipsideViewControllerDelegateprotocol by this new method:

-(void)flipsideViewControllerSelectionChangedToIndex:(int)index;

（2）在 FlipsideViewController中添加IBAction 为了重新分配分段控件的ValueChanged-Event：

(2) Add an IBAction in FlipsideViewController in order to resond to the ValueChanged-Event of the segmented control:

-(IBAction) valueChanged {
     [delegate flipsideViewControllerSelectionChangedToIndex: mapType_.selectedSegmentIndex];
}

（3）在 MainViewController 实现委托方法：

(3) In MainViewController implement the delegate method:

-(void)flipsideViewControllerSelectionChangedToIndex:(int)index {
    if (index == 0) mapView.mapType = MKMapTypeStandard;
    if (index == 1) mapView.mapType = MKMapTypeSatellite;
    if (index == 2) mapView.mapType = MKMapTypeHybrid;
}

并删除 MainViewController中的IBOutlet ！

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