iOS 按鈕上的文字添加底線的方法_IOS

問題：實現下圖中右側的按鈕文字效果

方法：

[MyTools createMyImageview:topEditView frame:CGRectMake(widthAll-90, 12, 17, 16) imageName:@"離線課程_下載更多.png"];UIButton *downMoreButton = [MyTools createMyBtn:@"下載更多" 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:@"下載更多"];NSRange titleRange = {0,[title length]};[title addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:titleRange];[downMoreButton setAttributedTitle:titleforState:UIControlStateNormal];[downMoreButton.titleLabel setFont:[UIFont systemFontOfSize:14]];[downMoreButton addTarget:self action:@selector(downMore) forControlEvents:UIControlEventTouchUpInside];

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