Question

我刚刚从Xcode模板创建了一个新的实用程序应用程序，我遇到了- (void)flipsideViewControllerDidFinish:(FlipsideViewController *)controller方法未被调用的问题。当我使用触控板上的三指点按来定义它时，它表示该方法是在MainViewController.m中定义的，当它肯定在Flip协议中时。

MainVC.h

#import "FlipsideViewController.h"

@interface MainViewController : UIViewController <FlipsideViewControllerDelegate, UIPopoverControllerDelegate>

@property (strong, nonatomic) UIPopoverController *flipsidePopoverController;
@property (weak, nonatomic) IBOutlet UIView *backgroundView;

@end

的.m

#import "MainViewController.h"

@interface MainViewController ()

@end

@implementation MainViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    _backgroundView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"Background.jpg"]];
    _backgroundView.contentMode = UIViewContentModeCenter;

    [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Flipside View Controller

- (void)flipsideViewControllerDidFinish:(FlipsideViewController *)controller
{
    //width
    if (controller.widthSegmentedControl.selectedSegmentIndex == 0) {
        //number of icons

    } else {
        //icon space
    }

    NSLog(@"b"); // not called
    [self.flipsidePopoverController dismissPopoverAnimated:YES];
}

- (void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController
{
    self.flipsidePopoverController = nil;
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"showAlternate"]) {
        [[segue destinationViewController] setDelegate:self];
        UIPopoverController *popoverController = [(UIStoryboardPopoverSegue *)segue popoverController];
        self.flipsidePopoverController = popoverController;
        self.flipsidePopoverController.delegate = self;
    }
}

- (IBAction)togglePopover:(id)sender
{
    if (self.flipsidePopoverController) {
        [self.flipsidePopoverController dismissPopoverAnimated:YES];
        self.flipsidePopoverController = nil;
    } else {
        [self performSegueWithIdentifier:@"showAlternate" sender:sender];
    }
}

@end

FlipVC.h

#import <UIKit/UIKit.h>

@class FlipsideViewController;

@protocol FlipsideViewControllerDelegate
- (void)flipsideViewControllerDidFinish:(FlipsideViewController *)controller;
@end

@interface FlipsideViewController : UIViewController
@property (weak, nonatomic) IBOutlet UISegmentedControl *widthSegmentedControl;
@property (weak, nonatomic) IBOutlet UITextField *widthNumberOfIcons;
@property (weak, nonatomic) IBOutlet UITextField *widthIconSpace;

@property (weak, nonatomic) IBOutlet UISegmentedControl *heightSegmentedControl;
@property (weak, nonatomic) IBOutlet UITextField *heightNumberOfIcons;
@property (weak, nonatomic) IBOutlet UITextField *heightIconSpace;

@property (weak, nonatomic) id <FlipsideViewControllerDelegate> delegate;

- (IBAction)done:(id)sender;

@end

的.m

#import "FlipsideViewController.h"

@interface FlipsideViewController ()

@end

@implementation FlipsideViewController

- (void)awakeFromNib
{
    self.preferredContentSize = CGSizeMake(320.0, 480.0);
    [super awakeFromNib];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Actions

- (IBAction)done:(id)sender
{
    NSLog(@"a"); //this is called
    [self.delegate flipsideViewControllerDidFinish:self];
}

@end

其中有两个NSLog，一个用于按下完成按钮的方法（a），另一个用于应该调用didFinish方法的方法（b）。问题是当我按下翻转控制器上的完成按钮时没有任何反应（尽管“a”被记录）。

Answer 1

我发现了问题。我删除了默认的按钮栏信息项，并用普通按钮替换它。问题是segue需要锚定到该按钮并连接到MainViewController.m文件中的togglePopover方法。

Xcode认为委托方法实际上是一个被声明的新方法

1 个答案: