ios 网络图片不变形处理

最新推荐文章于 2020-12-15 15:38:27 发布

原创最新推荐文章于 2020-12-15 15:38:27 发布 · 639 阅读

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本文介绍如何使用UIImageView在iOS应用中加载网络图片，并通过裁剪调整图片大小以适应指定视图尺寸。代码示例展示了如何使用SDWebImage库进行异步加载，并在加载完成后裁剪图片。

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    UIImageView *imageView =[[UIImageView alloc] initWithFrame:CGRectMake(20, 100, 176, 136)];

    [self.view addSubview:imageView];

    

    NSString *path = @"http://photocdn.sohu.com/20090420/Img263501893.jpg";

    [imageView sd_setImageWithURL:[NSURL URLWithString:path] placeholderImage:[UIImage imageNamed:@"deafult.png"] completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {

        imageView.image = [self cutImage:image imgViewWidth:176 imgViewHeight:136];

    }];

//裁剪图片
- (UIImage *)cutImage:(UIImage*)image imgViewWidth:(CGFloat)width imgViewHeight:(CGFloat)height{
    //压缩图片
    CGSize newSize;CGImageRef imageRef = nil;
    if ((image.size.width / image.size.height) < (width / height)) {
        newSize.width = image.size.width;
        newSize.height = image.size.width * height /width;
        imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(0, fabs(image.size.height - newSize.height) / 2, newSize.width, newSize.height));
        
    } else {
        newSize.height = image.size.height;newSize.width = image.size.height * width / height;
        imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(fabs(image.size.width - newSize.width) / 2, 0, newSize.width, newSize.height));
        
    }
    return [UIImage imageWithCGImage:imageRef];
}