修改原生UIAlertController的样式

先上个效果图

实现代码

-(void)alertWithTitle:(NSString*)title andMessage:(NSString*)message{

    UIAlertController * alertContorller = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:(UIAlertControllerStyleAlert)];
    
    UIView *subView1 = alertContorller.view.subviews[0];
    UIView *subView2 = subView1.subviews[0];
    UIView *subView3 = subView2.subviews[0];
    UIView *subView4 = subView3.subviews[0];
    UIView *subView5 = subView4.subviews[0];
    //设置title的对齐方式
    UILabel * titleLab = subView5.subviews[0];
    titleLab.textAlignment = NSTextAlignmentLeft;
    //设置内容的对齐方式
    UILabel *mes= subView5.subviews[1];
    mes.textAlignment = NSTextAlignmentRight;
    
    //设置 title 的字体颜色 大小
    NSDictionary* dic=@{NSForegroundColorAttributeName:[UIColor orangeColor],
                        NSFontAttributeName:[UIFont systemFontOfSize:28],
                        NSExpansionAttributeName:@(0.2),
                        };
    NSMutableAttributedString*attributedStr=[[NSMutableAttributedString  alloc]initWithString:title attributes:dic];
    [alertContorller setValue:attributedStr forKey:@"attributedTitle"];
    
    
    //设置 message 的字体颜色 大小
    NSDictionary* messageDic=@{NSForegroundColorAttributeName:[UIColor redColor],
                        NSFontAttributeName:[UIFont systemFontOfSize:12],
                        NSExpansionAttributeName:@(0.2),
                        };
    NSMutableAttributedString* attributedMesStr=[[NSMutableAttributedString  alloc]initWithString:message attributes:messageDic];
    [alertContorller setValue:attributedMesStr forKey:@"attributedMessage"];
    
    
    
    UIAlertAction * cancelAction = [UIAlertAction actionWithTitle:@"返回" style:(UIAlertActionStyleCancel) handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"返回");
    }];
    //设置字体颜色
    [cancelAction setValue:[UIColor purpleColor] forKey:@"titleTextColor"];
    
    UIAlertAction * sureAction = [UIAlertAction actionWithTitle:@"继续选择" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"继续");
    }];
    //设置字体颜色
    [sureAction setValue:[UIColor magentaColor] forKey:@"titleTextColor"];
    
    [alertContorller addAction:cancelAction];
    [alertContorller addAction:sureAction];
    [self presentViewController:alertContorller animated:YES completion:nil];
}