iphone - uibutton onclick 不调用/打开网页

Question

我定义了两个按钮。其中一个单击时必须打开撰写邮件屏幕，而另一个单击时必须调用。我的定义如下。但是当按下按钮时，它也不会打开

-(IBAction) phoneButtonPressed:(id) sender{
    NSString *phoneNumber = [[NSString alloc] initWithString:@"4216483330"];

    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:phoneNumber]];
}

-(IBAction) mailButtonPressed:(id) sender{

        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto:<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="5435273f35383d362635263d353a1439353d387a243d20207a313021" rel="noreferrer noopener nofollow">[email protected]</a>?subject=ULS Library"]];  
}

Answer 1

对于电话#，网址应以“tel:”为前缀，如下所示:

NSString *phoneNumber = [[NSString alloc] initWithString:@"tel:4216483330"];

对于邮件，问题是 url 字符串(在“ULS 库”中)中有一个空格，在将其提供给 NSURL 之前需要对其进行转义:

NSString *urlString = @"mailto:<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e081938b818c898292819289818ea08d81898cce90899494ce858495" rel="noreferrer noopener nofollow">[email protected]</a>?subject=ULS Library";
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:[urlString 
        stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]; 

请参阅Apple URL Scheme Reference .