无论如何，这两种方法同时被调用，如何解决？

Posted 2023-02-23

【中文标题】无论如何，这两种方法同时被调用，如何解决？

【英文标题】：Both methods being called at the same time no matter what, how to fix it?

【发布时间】：2014-02-19 18:37:16

【问题描述】：

.h

- (void)checkForWIFIConnection;

.m

- (void)checkForWIFIConnection 
    Reachability* wifiReach = [Reachability reachabilityForLocalWiFi];
    NetworkStatus netStatus = [wifiReach currentReachabilityStatus];
    if (netStatus!=ReachableViaWiFi)
    
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"No WIFI available!", @"AlertView")
                                                            message:NSLocalizedString(@"You have no wifi connection available. Please connect to a WIFI network.", @"AlertView")
                                                           delegate:self
                                                  cancelButtonTitle:NSLocalizedString(@"Cancel", @"AlertView")
                                                  otherButtonTitles:NSLocalizedString(@"Open settings", @"AlertView"), nil];
        [alertView show];
    




- (void)viewDidLoad 
    [super viewDidLoad];

    [self checkForWIFIConnection]; // this does not show an alert...
    [self parseXML]; // ...if this is here, but if i remove this line i get the UIALert saying no INTERNET

...

如果 checkForInternetConnection 没有失败，我如何让他只解析？

我认为这就像 if self Checkforwifi... do this else do that

但是我的 checkforwifi 是无效的，并且不返回 BOOL，我尝试更改方法，但由于我有点新，所以我失败了。

有什么帮助吗？

干杯

【参考方案1】：

- (BOOL)checkForWIFIConnection 
    Reachability* wifiReach = [Reachability reachabilityForLocalWiFi];
    NetworkStatus netStatus = [wifiReach currentReachabilityStatus];
    if (netStatus!=ReachableViaWiFi)
    
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"No WIFI available!", @"AlertView")
                                                            message:NSLocalizedString(@"You have no wifi connection available. Please connect to a WIFI network.", @"AlertView")
                                                           delegate:self
                                                  cancelButtonTitle:NSLocalizedString(@"Cancel", @"AlertView")
                                                  otherButtonTitles:NSLocalizedString(@"Open settings", @"AlertView"), nil];
        [alertView show];
        return NO:
    
    return YES;


- (void)viewDidLoad 
    [super viewDidLoad];

    if([self checkForWIFIConnection]) 
        [self parseXML]; // ...if this is here, but if i remove this line i get the UIALert saying no INTERNET
    

返回状态（一个 BOOL）并在调用 parseXML 之前检查它，如上所示。

【参考方案2】：

在您的 .h 中，将其更改为：

- (BOOL)checkForWIFIConnection;

在你的 .m 中，将其更改为：

- (BOOL)checkForWIFIConnection

然后也在.m文件中，在方法的最后，添加：

return netStatus == ReachableViaWiFi;

然后您可以在viewDidLoad 方法中设置您的if 语句。

【参考方案3】：

简单。让您的 checkForWIFIConnection 方法返回结果：

- (BOOL)checkForWIFIConnection 
    Reachability* wifiReach = [Reachability reachabilityForLocalWiFi];
    NetworkStatus netStatus = [wifiReach currentReachabilityStatus];
    if (netStatus!=ReachableViaWiFi)
    
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"No WIFI available!", @"AlertView")
                                                            message:NSLocalizedString(@"You have no wifi connection available. Please connect to a WIFI network.", @"AlertView")
                                                           delegate:self
                                                  cancelButtonTitle:NSLocalizedString(@"Cancel", @"AlertView")
                                                  otherButtonTitles:NSLocalizedString(@"Open settings", @"AlertView"), nil];
        [alertView show];

        return NO;
     else 
        return YES:
    


- (void)viewDidLoad 
    [super viewDidLoad];

    if ([self checkForWIFIConnection]) 
        [self parseXML];
    

    ...

而且您不需要在 .h 文件中声明 checkForWIFIConnection。这是其他类不需要的私有方法。