iphone - 防止从 iphone sdk 中的 uiimage 拉伸图像

Question

代码片段

        self.newsImage = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,300,130)];
        //set placeholder image or cell won't update when image is loaded
        self.newsImage.image = [UIImage imageNamed:@"newsDetail.png"];
        //load the image
        self.newsImage.imageURL = [NSURL URLWithString:imageBig];
        [imageBack addSubview:self.newsImage];

我有一张 40*40 大小的图像，但图像视图大小为 300*130。如何避免拉伸图像。

我想要 UIImageview 的中心。

提前致谢 ！！！！

Answer 1

只需将内容居中：

self.newsImage.contentMode = UIViewContentModeCenter;

Answer 2

您必须将 CGSize 设置为您的图像宽度和高度，以便图像不会拉伸并且它安排在中间。

- (UIImage )imageWithImage:(UIImage )image scaledToFillSize:(CGSize)size
{
    CGFloat scale = MAX(size.width/image.size.width, size.height/image.size.height);
    CGFloat width = image.size.width * scale;
    CGFloat height = image.size.height * scale;
    CGRect imageRect = CGRectMake((size.width - width)/2.0f,
                                  (size.height - height)/2.0f,
                                  width,
                                  height);

    UIGraphicsBeginImageContextWithOptions(size, NO, 0);
    [image drawInRect:imageRect];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}