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UIAlertController 用 KVC 和富文本自定义 标题和信息 的颜色和字体

//富文本属性 
NSMutableAttributedString *attributedTitle = [[NSMutableAttributedString alloc] initWithString:@"提交成功!" 
attributes:
@{NSFontAttributeName:[UIFont systemFontOfSize:12],NSForegroundColorAttributeName:[UIColor darkGrayColor]}];

//富文本属性 
NSMutableAttributedString *attributedMessage = [[NSMutableAttributedString alloc]
initWithString:@"结算钱款会在2到3个工作日内转到您的收款帐号,请您注意查收哦!"
attributes:
@{NSFontAttributeName:[UIFont systemFontOfSize:12],NSForegroundColorAttributeName:[UIColor darkGrayColor]}];

// 在 viewDidLoad 中创建
self.alertVC = [UIAlertController alertControllerWithTitle: 
attributedTitle.string 
message:attributedMessage.string 
preferredStyle:UIAlertControllerStyleAlert];

// 用 KVC 修改其 没有暴露出来的 
[self.alertVC setValue:attributedTitle forKey:@"attributedTitle"];
[self.alertVC setValue:attributedMessage forKey:@"attributedMessage"];
[self.alertVC addAction:[UIAlertAction actionWithTitle:@"知道了" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
      //用控制器  跳转到下一个控制器
      // Attempting to load the view of a view controller while it is deallocating is not allowed and may result in undefined behavior
 }]];
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