如何通过单击不透明按钮来调整 url 中的图像大小？
我对 Objective 还很陌生，我正在尝试增强 iPhone 应用程序（由其他人完成的编码）。我正在尝试从互联网上提取图像并将其显示为缩略图。
这个想法是让用户单击按钮（其后面的图像不透明）并将其调整为完整尺寸 - 覆盖整个屏幕。
这是我的按钮操作的 .m 文件代码：
-(IBAction)changeFullSize{
test.text = @"YOU HAVE CLICKED!";
// grab the original image
CGSize newSize = CGSizeMake(320, 480);
UIGraphicsBeginImageContext(newSize);
[urlImage.image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
我认为调整大小之类的事情很容易，但由于某种原因我无法做到正确。谢谢！
I'm pretty new to objective and I'm trying to enhance an iPhone app (coding done by someone else). I'm trying to pull an image from the internet and its displayed as a thumbnail.
The idea is to have the user click the button (opaque with the image behind it) and have it resize to full size - covering the whole screen.
This is my .m file code for the button action:
-(IBAction)changeFullSize{
test.text = @"YOU HAVE CLICKED!";
// grab the original image
CGSize newSize = CGSizeMake(320, 480);
UIGraphicsBeginImageContext(newSize);
[urlImage.image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
I thought something like resizing would be easy but I just can't get it right for some reason. Thanks!
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你不能将图像放入 UIImageView 并将内容模式设置为 UIViewContentModeScaleToFill 吗？然后点击按钮时将 UIImageview 的大小调整为全屏？
can't you just put your image into a UIImageView and set the content mode to UIViewContentModeScaleToFill? Then just resize the UIImageview to full screen when the button is tapped?