ios - 可达性没有可见的@interface 声明选择器 startNotifier

Question

我得到这个错误:可达性没有可见的@interface 声明选择器 startNotifier

我已经包含了 Reachability.h 和 .m 文件。我对 Objective-C 非常陌生，错误可能真的很小!但任何帮助都会很棒!

我的 helloworldViewController.m

#import "helloworldViewController.h"
#import "Reachability.h"
#import <SystemConfiguration/SystemConfiguration.h>


@interface helloworldViewController ()

@end

@implementation helloworldViewController
@synthesize networkstatus;
@synthesize reach;



#pragma mark Reachability changed


- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
        // Check network
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];
    self.reach = [Reachability reachabilityWithHostName:@"www.apple.com"];
    [self.reach startNotifer];

}

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

- (void)reachabilityChanged:(NSNotification*)note
{
    Reachability* r = [note object];
    NetworkStatus ns = r.currentReachabilityStatus;

    if (ns == NotReachable)
    {
        NSString* msg = @"Network problems have rendered the iTunes store inaccessible; please try again later.";
        UIAlertView* av = [[UIAlertView alloc] initWithTitle:nil
                                                     message:msg
                                                    delegate:self
                                           cancelButtonTitle:@"Ok"
                                           otherButtonTitles:nil];
        [av show];
        //[av release];
    }
}


@end

这是我的 helloworldViewController.h

#import <UIKit/UIKit.h>
#import "Reachability.h"

@interface helloworldViewController : UIViewController{


    Reachability* reach;
    IBOutlet UILabel *networkstatus;

}
@property(strong,nonatomic) UILabel *networkstatus;
@property (nonatomic, retain) Reachability* reach;

@end

Answer 1

您拼错了方法。更改此行:

[self.reach startNotifer];

到:

[self.reach startNotifier];

由于你是新手，这里还有一些建议:

• 将.h文件中的#import "Reachability.h"替换为@class Reachability。
• 去掉显式的ivars 和显式的@synthesize 行。让编译器为您生成这些。这假设您使用的是最新的编译器/Xcode。
• 您的属性不一致。一个是strong，另一个是retain。如果您使用的是 ARC，请对两者都使用 strong。如果您正在使用 MRC，请为两者使用 retain。
• 标准惯例是类名以大写字母开头，方法和变量以小写字母开头。两者都应该使用 CamelCase。将您的类更改为 HelloWorldViewController。将 networkstatus 更改为 networkStatus。