iOS开发 自定义UIAlertController的样式

引言:

UIAlertController的基本使用

一个简单的提示框:

    UIAlertController *alert    = [UIAlertController alertControllerWithTitle:@"标题" message:@"正文" preferredStyle:(UIAlertControllerStyleAlert)];

    UIAlertAction *okAction     = [UIAlertAction actionWithTitle:@"确定" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction * _Nonnull action) {

        // 点击确定按钮时 要进行的操作可以写到这里

    }];

    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:(UIAlertActionStyleCancel) handler:^(UIAlertAction * _Nonnull action) {

        // 点击取消按钮时 要进行的操作可以写到这里

    }];

    [alert addAction:cancelAction];

    [alert addAction:okAction];

    [self presentViewController:alert animated:YES completion:nil];

自定义UIAlertController

主要是使用kvc的方式来自定义UIAlertController的样式:

    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"标题" message:@"内容" preferredStyle:UIAlertControllerStyleAlert];

    // 使用富文本来改变alert的title字体大小和颜色

    NSMutableAttributedString *titleText = [[NSMutableAttributedString alloc] initWithString:@"这里是标题"];

    [titleText addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:24] range:NSMakeRange(0, 2)];

    [titleText addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, 2)];

    [alert setValue:titleText forKey:@"attributedTitle"];

    // 使用富文本来改变alert的message字体大小和颜色

    // NSMakeRange(0, 2) 代表:从0位置开始 两个字符

    NSMutableAttributedString *messageText = [[NSMutableAttributedString alloc] initWithString:@"这里是正文信息"];

    [messageText addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:10] range:NSMakeRange(0, 6)];

    [messageText addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, 2)];

    [messageText addAttribute:NSForegroundColorAttributeName value:[UIColor brownColor] range:NSMakeRange(3, 3)];

    [alert setValue:messageText forKey:@"attributedMessage"];

    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];

    // 设置按钮背景图片

    UIImage *accessoryImage = [[UIImage imageNamed:@"selectRDImag.png"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

    [cancelAction setValue:accessoryImage forKey:@"image"];

    // 设置按钮的title颜色

    [cancelAction setValue:[UIColor lightGrayColor] forKey:@"titleTextColor"];

    // 设置按钮的title的对齐方式

    [cancelAction setValue:[NSNumber numberWithInteger:NSTextAlignmentLeft] forKey:@"titleTextAlignment"];

    UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确认" style:UIAlertActionStyleDefault handler:nil];

    [alert addAction:okAction];

    [alert addAction:cancelAction];

    [self presentViewController:alert animated:YES completion:nil];

效果图:

效果图

demo下载地址:CustomAlertControllerDemo

原文链接：http://www.jianshu.com/p/a0785cb0601b