iOS 按钮上的文字添加下划线的方法

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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