UIPopover问题

Question

我有一个包含tableview.This表格视图的视图控制器，它显示在UIPopover控制器的父视图中。我想要在父视图的UITextField中设置popover控制器中选定单元格的文本，并且希望在选择后关闭popover。我无法实现这一点。

popover控制器的代码

.h文件

#import <UIKit/UIKit.h>

@protocol SelectLocationViewControllerDelegate <NSObject>

- (void)locationSelected:(NSString *)location;

@end

@interface SelectLocationViewController : UIViewController <UITableViewDataSource, UITableViewDelegate> {
    IBOutlet UITableView *locationTableView;
    NSArray *locationtypes;
    id delegate;


}

@property (nonatomic, retain) UITableView * locationTableView;
@property (nonatomic, retain) NSArray * locationtypes;
@property (nonatomic, assign) id<SelectLocationViewControllerDelegate> delegate;


@end

弹出窗口的.m文件

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    NSInteger row = [indexPath row];

    NSString *locationSelected = [self.dwellingTypes objectAtIndex:row];

    [self.delegate locationSelected: locationSelected];  // This don't gets invoked.

}

父类

- (void) locationSelected:(NSString *)location {

    ----Here i set the the text for text field and dismiss the popover----
    [popoverController dismissPopoverAnimated:YES];
}

父类中存在的locationselected方法不会被调用。

请任何人帮我解决这个问题。

谢谢

我创建的popover是否正确？

.h file

#import <UIKit/UIKit.h>
#import "SelectLocationViewController.h"
@interface SearchViewController : UIViewController<SelectLocationViewControllerDelegate,UIPopoverControllerDelegate>{

    SelectLocationViewController * selectLocationViewController;
    UIPopoverController * locationpopover;
    IBOutlet UITextField *locationSelectedField;

}
@property (nonatomic, retain) UIPopoverController * locationpopover;
@property (nonatomic, retain) SelectLocationViewController * selectLocationViewController;



.m file

- (void)viewDidLoad {

selectLocationViewController=[[SelectLocationViewController alloc]init];  //The class which i am displaying inside the popover
selectLocationViewController.delegate=self;
UINavigationController *navigationcontroller=[[UINavigationController alloc]initWithRootViewController: selectLocationViewController];

locationpopover = [[UIPopoverController alloc] initWithContentViewController:navigationcontroller]; 
[locationpopover setPopoverContentSize:CGSizeMake(290,410) animated:YES];
[locationpopover setDelegate:self];

}

- (void)itemSelected:(NSString *)dwelling //This is the method which is called from the other class when a row is selected from the tableview in SelectLocationViewController class
{    

    locationSelectedField.text= dwelling;
    NSLog(@"DwellingSelectedField iside tap:%@",dwelling);   //I get the text printed here
    [locationpopover dismissPopoverAnimated:YES];

}

Answer 1

我相信它不会被调用，因为你没有设置你的委托属性。您应该检查这部分代码。或者，如果可以，请将其添加到您的帖子中。

Answer 2

问题出在委托上。我将方法调用从

[self.delegate locationSelected: locationSelected]

其中，location locationSelected是保存所选单元格中的字符串的NSString。

至

[delegate locationSelected: locationSelected]; 

例如，如果我创建了一个协议，比如

@protocol locationControllerDelegate <NSObject>

- (void)locationSelected:(NSString *)location;

@end

并且在声明协议的类的接口中，它应该采用以下方式

 @interface SelectLocationViewController : UIViewController <UITableViewDataSource, UITableViewDelegate,locationControllerDelegate> {

.
.
 id delegate;


}

@property (nonatomic, assign) id<locationControllerDelegate> delegate;


@end

在didSelectForRowAtIndexPath方法中

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    NSInteger row = [indexPath row];

    NSString *locationSelected = [locationTypes objectAtIndex:row];

    [delegate locationSelected: locationSelected]; 

}

在接口的.h文件中实现方法的类中，应该像使用其他委托(UISCrollViewDelegate等)一样继承协议，而在.m文件中，就像实现正常的方法实现一样，我们可以实现协议中定义的方法

因此，只要在TableView中选择了一行，就会调用此方法，并将字符串设置为您希望设置文本的标签或文本字段