iOS 修改alertViewController弹框的字体颜色及字体的方法

系统默认的字体是黑色，按钮颜色是蓝色或者红色的，我们怎样自定义字体呢

codeing show

uialertcontroller *alertvc = [uialertcontroller alertcontrollerwithtitle:@"提示" message:@"确认退出登录？" preferredstyle:(uialertcontrollerstylealert)];
 uialertaction *cancelaction = [uialertaction actionwithtitle:@"取消" style:uialertactionstylecancel handler:^(uialertaction * _nonnull action) {
 nslog(@"点击了cancel");
 [alertvc dismissviewcontrolleranimated:yes completion:nil];
 }];
 uialertaction *okaction = [uialertaction actionwithtitle:@"确定" style:uialertactionstyledefault handler:^(uialertaction * _nonnull action) {
 nslog(@"点击了ok");
 [[nsuserdefaults standarduserdefaults] setobject:nil forkey:kloginuserkey];
 [alertvc dismissviewcontrolleranimated:yes completion:nil];
 }];
 //修改title
 nsmutableattributedstring *alertcontrollerstr = [[nsmutableattributedstring alloc] initwithstring:@"提示"];
 [alertcontrollerstr addattribute:nsforegroundcolorattributename value:kmaintextcolor range:nsmakerange(0, 2)];
 [alertcontrollerstr addattribute:nsfontattributename value:[uifont systemfontofsize:15] range:nsmakerange(0, 2)];
 [alertvc setvalue:alertcontrollerstr forkey:@"attributedtitle"];
 //修改message
 nsmutableattributedstring *alertcontrollermessagestr = [[nsmutableattributedstring alloc] initwithstring:@"确认退出登录？"];
 [alertcontrollermessagestr addattribute:nsforegroundcolorattributename value:ksubtextcolor range:nsrangefromstring(@"确认退出登录？")];
 [alertcontrollermessagestr addattribute:nsfontattributename value:[uifont systemfontofsize:13] range:nsrangefromstring(@"确认退出登录？")];
 [alertvc setvalue:alertcontrollermessagestr forkey:@"attributedmessage"];
 //修改按钮字体颜色
 [cancelaction setvalue:kgreencolor forkey:@"titletextcolor"];
 [okaction setvalue:kgreencolor forkey:@"titletextcolor"];
 [alertvc addaction:cancelaction];
 [alertvc addaction:okaction];
 [self presentviewcontroller:alertvc animated:yes completion:nil];

这里的kgreencolor 等是我自定义的颜色，换成自己的字体颜色即可

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