简单的UIAlertView与NSAttributedString（s）
我正在寻找一个简单的方法来使用一个非常简单的消息框类似于NSAttributedString ：
NSString *new_item = [NSString stringWithFormat:@"<span style=\"font-family: Helvetica Neue; font-size: 12.0\">%@</span>", @"MOTD HTML String downloaded from website"]; NSAttributedString * attrStr = [[NSAttributedString alloc] initWithData:[new_item dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil]; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"MOTD" message:attrStr delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show];
我上面的代码需要一个HTML格式的string，已经从服务器上下载，确保文本大小适合屏幕，然后尝试将NSAttributedString发送到UIAlertView 。 但是UIAlertView不喜欢这个。 这个问题最简单的方法是什么？（非HTML格式的MOTD不是一个选项）
将您的属性string添加到标签，并添加它作为assessoryView警报
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Test Attributed String" message:@"" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:nil, nil]; UILabel *lbl = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 100)]; NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc]initWithString:@"Hello red"]; [attributedStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0,5)]; lbl.attributedText = attributedStr; lbl.textAlignment = NSTextAlignmentCenter; [alert setValue:lbl forKey:@"accessoryView"]; [alert show];
现在一天UIAlertView已被弃用。 你可以使用UIAlertController 。
我只从@AshishKakkad的答案中得到一个想法（+1）。 但是，其UI不可见。 所以我正在向你展示一种使用Javastring格式化消息的方法。
以下是我如何做到这一点：
NSMutableString *message = [NSMutableString string]; NSString *title = @"Message Heading"; [message appendString:title]; [message appendString:@"\n\n• Topic 1"]; [message appendString:@"\n• Topic 2"]; [message appendString:@"\n• Topic 3\n"]; //Important, I have added '\n' at last to have some extra space at bottom. UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Title" message:@"" delegate:self cancelButtonTitle:@"CancelButton" otherButtonTitles:@"OtherButton", nil]; //need to set a label as `accessoryView` of an alert. [alert setValue:[self getLabelWithMessage:message withTitle:title] forKey:@"accessoryView"]; [alert show];
- (UILabel *)getLabelWithMessage:(NSMutableString *)message withTitle:(NSString *)title { NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init]; [paragraphStyle setAlignment:NSTextAlignmentLeft]; paragraphStyle.paragraphSpacing = 2.0f; paragraphStyle.headIndent = 20.0; paragraphStyle.firstLineHeadIndent = 20.0; paragraphStyle.tailIndent = -20.0; NSMutableAttributedString *attribString = [[NSMutableAttributedString alloc]initWithString:message]; [attribString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [message length])]; [attribString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:12.f] range:NSMakeRange(0, [message length])]; [attribString addAttribute:NSFontAttributeName value:[UIFont boldSystemFontOfSize:12.f] range:NSMakeRange(0, [title length])]; UILabel *label = [[UILabel alloc] init]; [label setAttributedText:attribString]; [label setNumberOfLines:0]; [label sizeToFit]; return label; }
不要忘记设置：
lbl.numberOfLines = 0;
当你有多条线路