ios - UIRefreshControl attributedTitle 多行

Question

是否可以在 UIRefreshControl 标题中使用多行？每当我将\n 添加到 NSAttributedString 时，只会显示第一行。我正在尝试设置标题，并在下一行添加更多文本。那么是否有在 UIRefreshControl 中使用两行文本的解决方法？

这是当前代码，其中仅显示“Title Here”:

self.refreshControl = [[UIRefreshControl alloc] init];

NSString *title = @"Title Here";
NSString *subText = @"Subtext Here";
NSMutableAttributedString *attString=[[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat:@"%@\n%@",title,subText]];

[attString addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Helvetica" size:20.0f] range:NSMakeRange(0, [title length])];
[attString addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Helvetica" size:14.0f] range:NSMakeRange([title length],[subText length])];

[attString addAttribute:NSForegroundColorAttributeName value:[UIColor blackColor] range:NSMakeRange(0, [title length])];
[attString addAttribute:NSForegroundColorAttributeName value:[UIColor lightGrayColor] range:NSMakeRange([title length], [subText length])];

self.refreshControl.attributedTitle = attString;

Answer 1

这里有一个tricky方法:在 UIRefreshControl 中找到 UILabel 并设置 numberOfLines = 0。

UILabel *titleLabel = [[[[self.refreshControl subviews] firstObject] subviews] lastObject];
if (titleLabel) {
    titleLabel.numberOfLines = 0;

    NSString title = @"Pull to Refresh.\nUpdated Time: 09:30"; // \n for new line.
    self.refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:title];
}