Question

XCode 5中的一个示例项目名为“Utility Application”。它有一个主视图和一个备用视图，并设置一个Info按钮将主视图翻转到备用视图。它使用viewcontroller委托和协议定义从翻转视图切换回主视图。在XCode 6中它不再存在。

当我在XCode 6中运行这个简单的XCode 5示例应用程序时，我会在下面的方法中收到警告：

 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"showAlternate"]) {
        [[segue destinationViewController] setDelegate:self]; //<<<< Here is where the warning appears
    }
}

警告是：将'MainViewController * const_strong'发送到不兼容类型'id'的参数

这是什么？一个bug？该应用程序在模拟器和iOS设备上运行良好。以下是整个代码。任何帮助将不胜感激。

**//  MainViewController.h

#import "FlipsideViewController.h"

@interface MainViewController : UIViewController <FlipsideViewControllerDelegate>

@end

//  MainViewController.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.
}

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

#pragma mark - Flipside View

- (void)flipsideViewControllerDidFinish:(FlipsideViewController *)controller
{
    [self dismissViewControllerAnimated:YES completion:nil];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"showAlternate"]) {
        [[segue destinationViewController] setDelegate:self]; //<<<< Here is where the warning appears
    }
}

@end


//  FlipsideViewController.h

#import <UIKit/UIKit.h>

@class FlipsideViewController;

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

@interface FlipsideViewController : UIViewController

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

- (IBAction)done:(id)sender;

@end


//  FlipsideViewController.m

#import "FlipsideViewController.h"

@interface FlipsideViewController ()

@end

@implementation FlipsideViewController

- (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
{
    [self.delegate flipsideViewControllerDidFinish:self];
}

@end**

Answer 1

您可能已经想到了这一点......只是想发布一个链接，以便找到那些绊脚石：getting a warning setting up delegate for a custom protocol

xcode 6 Beta - ViewPort代表的奇怪警告

1 个答案: