将 UIImage 添加到 UIAlertView 未按预期工作

Posted 2023-02-23

【中文标题】将 UIImage 添加到 UIAlertView 未按预期工作

【英文标题】：Adding UIImage to UIAlertView is not working as expected

【发布时间】：2017-02-27 11:36:53

【问题描述】：

我正在开发一个应用程序。我尝试使用以下代码将 UIIMage 添加到 UIAlertView，

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Instruction"
                                                    message:@"Please TAP on Screen to Continue."
                                                   delegate:self
                                          cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(220, 50, 32, 32)];
UIImage *img = [UIImage imageNamed:@"pendingImg.png"];
[imageView setImage:img];
if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_ios_6_1) 
    [alert setValue:imageView forKey:@"accessoryView"];
else
    [alert addSubview:imageView];

[alert show];

我的图像尺寸为 32 × 32 像素。我收到如图所示的警报，

我应该为此图像添加约束吗？还是要做什么？

【问题讨论】：

您通常不应该乱用 UIAlertView 的视图继承。创建自己的警报样式视图会更安全，更不用说更好了。

尝试将 imageView 的内容模式更改为宽高比匹配。

检查它是否与 UIImageView 的 contentMode UIViewContentModeScaleAspectFit 一起工作

看到这个***.com/questions/2323557/…

@Anbu.Karthik 我的问题是让图像看起来正常，上面的帖子是添加图像到 UIAlertView

【参考方案1】：

您可以将imageView contentMode 设置为UIViewContentModeScaleAspectFit，

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Instruction"
                                                    message:@"Please TAP on Screen to Continue."
                                                   delegate:self
                                          cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(220, 50, 32, 32)];
UIImage *img = [UIImage imageNamed:@"pendingImg.png"];
 imageView.contentMode = UIViewContentModeScaleAspectFit;

[imageView setImage:img];
if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_6_1) 
    [alert setValue:imageView forKey:@"accessoryView"];
else
    [alert addSubview:imageView];

[alert show];

可能Anbu.Karthik建议的链接评论对您也有帮助。

【讨论】：

如果您使用较大的尺寸，它会自动适合图像视图

imageView.contentMode = UIViewContentModeScaleAspectFit;是罪魁祸首:)

【参考方案2】：

试试这个

 UIAlertView* alert = [UIAlertView alloc] initWithTitle: @"Instruction" message: @"Please TAP on Screen to Continue." delegate:nil cancelButtonTitle:@"no" otherButtonTitles:@"yes", nil];

    UIImage* img = [UIImage imageNamed:@"pendingImg.png"];
    UIImageView* imgview = [UIImageView alloc] initWithFrame:CGRectMake(0, 0, img.size.width, img.size.height)];
    [img setImage:imgMyImage];

    [alert setValue: imgview forKey:@"accessoryView"];
    [alert show];

【讨论】：

它只是将图像添加到 UIAlertVIew，不知何故我用我的代码得到了它。

【参考方案3】：

UIAlertView* alert = [[UIAlertView alloc] initWithTitle: @"Instruction" message: @"Please TAP on Screen to Continue." delegate:nil cancelButtonTitle:@"no" otherButtonTitles:@"yes", nil];

   UIImage* img = [UIImage imageNamed:@"add.png"];
    UIImageView* imgview = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, img.size.width, img.size.height)];
    [imgview setImage:img];
    [alert setValue: imgview forKey:@"accessoryView"];
    [alert show];