阿权的书房

sudo discoveryutil udnsflushcaches

dscacheutil -flushcache; sudo killall -HUP mDNSResponder

sudo killall -HUP mDNSResponder

sudo dscacheutil -flushcache

ipconfig /flushdns

/etc/init.d/named restart
/etc/init.d/nscd restart

    if (![MFMailComposeViewController canSendMail]) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"请配置邮件"
                                                        message:@"你的设备不支持发邮件，需要你配置你的设备"
                                                       delegate:self
                                              cancelButtonTitle:@"好"
                                              otherButtonTitles:nil,nil];
        [alert show];
        return;
    }

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.headIndent = 15; // <--- indention if you need it
paragraphStyle.firstLineHeadIndent = 15; //首行缩进
paragraphStyle.lineSpacing = 7; // <--- magic line spacing here! 行间距
UIFont *font = xxx //
NSDictionary *attrsDictionary =
@{ NSFontAttributeName: font, //<-- if you need; & there are many more attrs
   NSParagraphStyleAttributeName: paragraphStyle};

self.textView.attributedText = [[NSAttributedString alloc]
initWithString:@"Hello World over many lines!" attributes:attrsDictionary];

        UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
        PhotoAlbumViewController *initViewController = [storyBoard instantiateViewControllerWithIdentifier:@"PhotoAlbum"];
        [self.navigationController pushViewController:initViewController animated:YES];