问题：实现下图中右侧的按钮文字效果
方法：
[MyTools createMyImageview:topEditView frame:CGRectMake(widthAll-90, 12, 17, 16) imageName:@"离线课程_下载更多.png"]; UIButton *downMoreButton = [MyTools createMyBtn:@"下载更多" frame:CGRectMake(widthAll-70, 10, 60, 20) uiview:topEditView uifont:14 color:[UIColor colorWithRed:92/255.0 green:218/255.0 blue:231/255.0 alpha:1]]; NSMutableAttributedString *title = [[NSMutableAttributedString alloc] initWithString:@"下载更多"]; NSRange titleRange = {0,[title length]}; [title addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:titleRange]; [downMoreButton setAttributedTitle:title forState:UIControlStateNormal]; [downMoreButton.titleLabel setFont:[UIFont systemFontOfSize:14]]; [downMoreButton addTarget:self action:@selector(downMore) forControlEvents:UIControlEventTouchUpInside];
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