iOS UIView 背景图片

iOS UIView Background Image

提问by Kovu

I want to have a UIImageas a background image on a UIView.

我想有一个UIImage作为背景图片UIView.

Here is my code:

这是我的代码：

UIColor *background = [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"login.png"]];
self.view.backgroundColor = background;
[background release];

The Problem is, that the scale is not okay. It scaled 640 to 480, so I can't tell it 100% sure but it looks like only 300 to 250 is displayed or something like that.

问题是，秤不好。它从 640 缩放到 480，所以我不能 100% 肯定地告诉它，但看起来只显示 300 到 250 或类似的东西。

Is there a fit to scale / fit to UIView / fit to size modus?

是否适合缩放/适合 UIView/适合尺寸模式？

采纳答案by GooKSL

According to the UIColorAPI:

根据UIColorAPI：

You can use pattern colors to set the fill or stroke color just as you would a solid color. During drawing, the image in the pattern color is tiled as necessary to cover the given area.

您可以使用图案颜色来设置填充或描边颜色，就像设置纯色一样。在绘图期间，图案颜色的图像根据需要平铺以覆盖给定区域。

That means it tries to create a pattern out of your image to fill the area. I think the optimal way to do it is so rescale your image to fit exactly the UIViewsize.

这意味着它会尝试从您的图像中创建一个图案来填充该区域。我认为最好的方法是重新调整图像以适应UIView大小。

There is a nice answer here how to resize your image during runtime:

如何在运行时调整图像大小这里有一个很好的答案：

The simplest way to resize an UIImage?

调整 UIImage 大小的最简单方法？

回答by uneakharsh

you are required to process your image before you add it, try this :

您需要在添加图像之前对其进行处理，请尝试以下操作：

UIGraphicsBeginImageContext(self.view.frame.size);
[[UIImage imageNamed:@"image.png"] drawInRect:self.view.bounds];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

self.view.backgroundColor = [UIColor colorWithPatternImage:image];

回答by Dipak Chaudhari

hello try this,

你好试试这个，

     self.view.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:@"login.png"]];

回答by girl_meets_droid

Specify an actual background and send it to the back of your view

指定实际背景并将其发送到视图的后面

//add background
UIImageView *background = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bg.png"]];
[myView addSubview:background];
[myView sendSubviewToBack:background];
myView.contentMode = UIViewContentModeScaleAspectFit;

回答by Zaid Pathan

In Swiftuse this...

在Swift 中使用这个...

    UIGraphicsBeginImageContext(self.view.frame.size)
    UIImage(named: "1.png")?.drawInRect(self.view.bounds)

    var image: UIImage = UIGraphicsGetImageFromCurrentImageContext()

    UIGraphicsEndImageContext()

    self.view.backgroundColor = UIColor(patternImage: image)

回答by Kevin Delord

And if you want to do it in swift:

如果你想快速完成：

self.view.backgroundColor = UIColor(patternImage: UIImage(named:"background.jpg"))

回答by Hossam Ghareeb

I'm using the following extension in Swift:

我在 Swift 中使用以下扩展：

extension UIView{

    func setBackgroundImage(img: UIImage){

        UIGraphicsBeginImageContext(self.frame.size)
        img.drawInRect(self.bounds)
        let patternImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        self.backgroundColor = UIColor(patternImage: patternImage)
    }
}

In code you can use like this:

在代码中，您可以像这样使用：

if let image = UIImage(named: "HomeBg"){
        self.view.setBackgroundImage(image)
    }

回答by Dino Tw

In the Interface Builder, add an Image Viewto Viewand select the image you want to use in Attributes inspector. Finally, make the Image Viewthe very first child of the Viewby dragging the element in Document Outline.

在 Interface Builder 中，添加Image View到View并选择要在 中使用的图像Attributes inspector。最后，通过拖动 中的元素来制作 的Image View第一个子View元素Document Outline。

回答by Zorayr

If the view is going to have the same size, you can place a method in your AppDelegate.mthat scales the background image on first run, and then keeps the scaled image in memory for future use:

如果视图将具有相同的大小，您可以AppDelegate.m在第一次运行时放置一个缩放背景图像的方法，然后将缩放后的图像保留在内存中以备将来使用：

UIImage *backgroundImage = nil;
- (void)setBackground:(UIView *)view
{
    if (backgroundImage == nil)
    {
        UIGraphicsBeginImageContext(view.frame.size);
        [[UIImage imageNamed:@"Background"] drawInRect:view.bounds];
        backgroundImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
    }
    view.backgroundColor = [UIColor colorWithPatternImage:backgroundImage];
}

Thanks to @uneakharsh for his help!

感谢@uneakharsh 的帮助！

回答by Manu P

UIColor *background = [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"image.png"]];
self.view.backgroundColor = background;
[background release];