Question

我有一个视图，并希望UIImage为此视图设置backGroudColor。代码为：

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

问题是：backImage'frame比视图小。如何将UIImage拉伸到我的视野。我知道使用UIImageView可以达到。

有人有好主意吗？

更新

我无法上传一张图片。

像这样：backImge的大小是30 * 30，我的视图大小是1024 * 700，当我使用myview.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"backImage.png"]];

时

结果是myview的backGroup有很多'backImage.png'。我的目标是有一个'backImage.png'充满我的观点。

Answer 1

试一试。

self.layer.contents = (id)[UIImage imageNamed:@"freshBackground.png"].CGImage;

夫特：

self.view.layer.contents = UIImage(named: "freshBackground")!.cgImage

Answer 2

据我所知，您无法直接调整背景图案图像的大小。最简单的方法是更改图像以适合父视图的帧大小。或者，您可以重新绘制图像以适合父视图的大小。

UIView * yourView = [[UIView alloc] initWithFrame:CGRectMake(10.f, 100.f, 300.f, 100.f)];
UIImage * targetImage = [UIImage imageNamed:@"backImage.png"];

// redraw the image to fit |yourView|'s size
UIGraphicsBeginImageContextWithOptions(yourView.frame.size, NO, 0.f);
[targetImage drawInRect:CGRectMake(0.f, 0.f, yourView.frame.size.width, yourView.frame.size.height)];
UIImage * resultImage = UIGraphicsGetImageFromCurrentImageContext();    
UIGraphicsEndImageContext();

[yourView setBackgroundColor:[UIColor colorWithPatternImage:resultImage]];

Answer 3

world000的答案翻译成Swift：

package org.eclipse.jetty.cookbook;

import java.io.File;
import java.nio.file.Path;

import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.webapp.WebAppContext;

public class WebAppContextFromFileSystem
{
    public static void main(String[] args) throws Exception
    {
        Server server = new Server(8080);

        Path warPath = new File("webapps/hello.war").toPath().toRealPath();
        System.err.println("WAR File is " + warPath);

        // A very bare bones example (see other examples for
        // how to use WebAppContext Configurations to enable
        // jndi, annotations, etc ...)
        WebAppContext webapp = new WebAppContext();
        webapp.setContextPath("/");
        webapp.setWar(warPath.toUri().toASCIIString());

        server.setHandler(webapp);

        server.start();
        server.join();
    }
}

Answer 4

根据Kjuly的回答，如果您希望图像在中心正确插入而不是被拉伸，请使用此方法获取新图像：

#pragma mark - Image
+(UIImage*)imageFitInCenterForSize:(CGSize)inSize forSourceImage:(UIImage*)inImage
{
    // redraw the image to fit |yourView|'s size
    CGSize imageOriginalSize = inImage.size;
    UIImage *resultImage = nil;
    if (imageOriginalSize.width<=inSize.width && imageOriginalSize.height<=inSize.height)
    {
        UIGraphicsBeginImageContextWithOptions(inSize, NO, 0.f);
        [inImage drawInRect:CGRectMake((inSize.width-imageOriginalSize.width)/2.0, (inSize.height-imageOriginalSize.height)/2.0, imageOriginalSize.width, imageOriginalSize.height)];
        resultImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
    }
    return resultImage;
}

与重载变体相同：

+(UIImage*)imageFitInCenterForSize:(CGSize)inSize forSourceImage:(UIImage*)inImage xOffset:(CGFloat)inXOffset yOffset:(CGFloat)inYOffset
{
    // http://stackoverflow.com/questions/10629403/ios-colorwithpatternimage-stretch-image-full-screen
    // redraw the image to fit |yourView|'s size
    CGSize imageOriginalSize = inImage.size;
    UIImage *resultImage = nil;
    if (imageOriginalSize.width<=inSize.width && imageOriginalSize.height<=inSize.height)
    {
        UIGraphicsBeginImageContextWithOptions(inSize, NO, 0.f);
        [inImage drawInRect:CGRectMake((inSize.width-imageOriginalSize.width)/2.0+inXOffset, (inSize.height-imageOriginalSize.height)/2.0+inYOffset, imageOriginalSize.width, imageOriginalSize.height)];
        resultImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
    }
    return resultImage;
}

Answer 5

我使用以下方法：

在特定范围内绘制图像（使其缩放）
将生成的图像用作图案。

代码：

UIGraphicsBeginImageContext(self.window.frame.size);
[[UIImage imageNamed:@"background"] drawInRect:self.window.bounds];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.window.backgroundColor = [UIColor colorWithPatternImage:image];

Answer 6

这里基于先前的评论，首先缩放图像，然后按比例填充图像。

func imageScaledToFillSize(size: CGSize, image: UIImage) -> UIImage
{
    let aspect = image.size.width / image.size.height;
    UIGraphicsBeginImageContextWithOptions(size, false, 0)
    if (size.width / aspect <= size.height) {
        let resizedImg = self.imageScaledToSize(CGSize(width: size.height * aspect, height: size.height), image: image)
        resizedImg.drawInRect(CGRectMake((size.width - resizedImg.size.width)/2, 0, resizedImg.size.width, resizedImg.size.height))
    } else {
        let resizedImg = self.imageScaledToSize(CGSize(width: size.width, height: size.width / aspect), image: image)
        resizedImg.drawInRect(CGRectMake(0, (size.height-resizedImg.size.height)/2, resizedImg.size.width, resizedImg.size.height))
    }
    let imageR = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return imageR;
}

func imageScaledToSize(size: CGSize, image: UIImage) -> UIImage {
    UIGraphicsBeginImageContextWithOptions(size, false, 0.0);
    image.drawInRect(CGRectMake(0.0, 0.0, size.width, size.height))
    let imageR = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext();
    return imageR;
}

ios：colorWithPatternImage，全屏拉伸图像

6 个答案:

夫特：