iOS开发 UIAlertController的 title、message、button的属性更改

本文链接：https://blog.youkuaiyun.com/Sky_zhang2015/article/details/85534767

本文介绍如何使用Swift自定义UIAlertController的标题、消息文本及按钮样式，包括设置字体、颜色、行间距、段间距和对齐方式等，实现美观且功能丰富的警告视图。

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// ------------title ---------
NSMutableAttributedString *attTitleString = [[NSMutableAttributedString alloc] initWithString:titleString];
[_alertController setValue:attTitleString forKey:@"attributedTitle"];

// -----------message --------
NSMutableAttributedString *attMsgString = [[NSMutableAttributedString alloc] initWithString:messageString];
// 设置字体
[attMsgString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:14] range:NSMakeRange(0, attMsgString.length)];
// 设置颜色
[attMsgString addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(0, 10)];

NSMutableParagraphStyle *paragraph = [[NSMutableParagraphStyle alloc] init];
// 设置行间距
[paragraph setLineSpacing:3];
// 设置段间距
[paragraph setParagraphSpacingBefore:5];
// 设置对齐方式
[paragraph setAlignment:NSTextAlignmentLeft];
// 设置书写方向
[paragraph setBaseWritingDirection:NSWritingDirectionLeftToRight];
[attMsgString addAttribute:NSParagraphStyleAttributeName value:paragraph range:NSMakeRange(0, attMsgString.length)];
[_alertController setValue:attMsgString forKey:@"attributedMessage"];

// ----按钮颜色------
NSArray *actionArr = [_alertController actions];
[actionArr.firstObject setTitle:alertTitle];
[actionArr.firstObject setValue:[UIColor orangeColor] forKey:@"titleTextColor"];