iOS之改變UIAlertViewController字體的顏色

NSString *message = @"請確認信息是否正確?";
NSString *title = @"提示";
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleActionSheet];
//改變title的大小和顏色
NSMutableAttributedString *titleAtt = [[NSMutableAttributedString alloc] initWithString:title];
[titleAtt addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:16] range:NSMakeRange(0, title.length)];
[titleAtt addAttribute:NSForegroundColorAttributeName value:[UIColor orangeColor] range:NSMakeRange(0, title.length)];
[alertController setValue:titleAtt forKey:@"attributedTitle"];
//改變message的大小和顏色
NSMutableAttributedString *messageAtt = [[NSMutableAttributedString alloc] initWithString:message];
[messageAtt addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:13] range:NSMakeRange(0, message.length)];
[messageAtt addAttribute:NSForegroundColorAttributeName value:[UIColor yellowColor] range:NSMakeRange(0, message.length)];
[alertController setValue:messageAtt forKey:@"attributedMessage"];
 [self presentViewController:alertController animated:YES completion:nil];

上面的是修改UIAlertViewController的title和message字體的大小和顏色，采用的是修改attributedString其中的NSForegroundColorAttributeName顏色屬性和NSFontAttributeName字體大小屬性。UIAlertViewController中的標題的key:@"attributedTitle"，標題中提示信息的key:@"attributedMessage"。

UIAlertAction *alertAction = [UIAlertAction actionWithTitle:@"知道了" style:UIAlertActionStyleDefault handler:nil];
[alertAction setValue:[UIColor purpleColor] forKey:@"_titleTextColor"];
//    alertController.view.tintColor = [UIColor greenColor];
[alertController addAction:alertAction];
UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
/*取消按鈕的顏色*/
[cancel setValue:[UIColor redColor] forKey:@"_titleTextColor"];
[alertController addAction:cancel];

修改UIAlertViewController中修改所有按鈕的顏色使用下面這個方法:

alertController.view.tintColor = [UIColor greenColor];

修改單個UIAlertAction按鈕的字體顏色使用下面這個方法:

[cancel setValue:[UIColor redColor] forKey:@"_titleTextColor"];