UIAlertController的使用及其自定义

UIAlertController的正常用法

// 上传

- (void)btnClick{

    /* preferredStyle有且只有这两种枚举类型

     *     UIAlertControllerStyleActionSheet  在屏幕底部弹出

     *     UIAlertControllerStyleAlert  在屏幕中间弹出

     */

//    UIAlertController *alertControl = [UIAlertController alertControllerWithTitle:@"标题" message:@"副标题" preferredStyle:UIAlertControllerStyleAlert];    

    UIAlertController *alertControl = [UIAlertController alertControllerWithTitle:@"标题" message:@"副标题" preferredStyle:UIAlertControllerStyleActionSheet];    

    UIAlertAction *Action1 = [UIAlertAction actionWithTitle:@"普通按钮" style:UIAlertActionStyleDefault handler:^(UIAlertAction *_Nonnull action) {

        //普通按钮

        NSLog(@"普通按钮是蓝色的");

    }];    

    UIAlertAction *Action2 = [UIAlertAction actionWithTitle:@"警告按钮" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *_Nonnull action) {

        //普通按钮

        NSLog(@"带有警告意味的按钮是红色的");

    }];    

    UIAlertAction *Action3 = [UIAlertAction actionWithTitle:@"取消按钮" style:UIAlertActionStyleCancel handler:^(UIAlertAction *_Nonnull action) {

        //普通按钮

        NSLog(@"取消按钮也是蓝色的，并且始终在最下面");

    }];

    

//    //如果是UIAlertControllerStyleActionSheet不能使用添加输入框的方法

//    [alertControl addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {

//        //添加输入框(已经自动add，不需要手动)

//        

//        textField.text = @"可以在这里写textfield的一些属性";

//        

//        //监听

//        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(listening:) name:UITextFieldTextDidChangeNotification object:textField];

//        }];

    

    [alertControl addAction:Action1];

    [alertControl addAction:Action2];

    [alertControl addAction:Action3];    

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

}

//// 监听输入框的输入

//- (void)listening:(NSNotification *)noti{

//    NSLog(@"%@", noti.object);

//}

UIAlertControllerStyleAlert  在屏幕中间弹出UIAlertControllerStyleActionSheet  在屏幕底部弹出

   

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UIAlertController的自定义（利用富文本与kvc）

    UIAlertController *alertControl = [UIAlertController alertControllerWithTitle:@"标题" message:@"副标题" preferredStyle:UIAlertControllerStyleAlert];

    // 自定义标题

    NSMutableAttributedString *title = [[NSMutableAttributedString alloc] initWithString:@"这是标题"];

    [title addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:17] range:NSMakeRange(0,4)];

    [title addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(0,4)];

    [alertControl setValue:title forKey:@"attributedTitle"];   

    // 自定义副标题

    NSMutableAttributedString *subTitle = [[NSMutableAttributedString alloc] initWithString:@"这是副标题"];

    [subTitle addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:13] range:NSMakeRange(0,5)];

    [subTitle addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(0,5)];

    [alertControl setValue:subTitle forKey:@"attributedMessage"];

    // 自定义取消按钮

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

    // 设置按钮背景图片

    UIImage *image = [[UIImage imageNamed:@"icon_182"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

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

    // 设置按钮的title颜色

    [cancelAction setValue:[UIColor orangeColor] 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];

    [alertControl addAction:okAction];

    [alertControl addAction:cancelAction];    

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

效果图：