ios - 缩放 UIImage 以正确适应 UIImageView

Question

我有以下代码，使用 UIImagePickerController

从照片库中获取图像

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *pickerImg = info[UIImagePickerControllerEditedImage];
    if (pickerImg == nil) {
        pickerImg = info[UIImagePickerControllerOriginalImage];
    }

    NSData *imageData = UIImagePNGRepresentation(pickerImg);
    UIImage *img = [UIImage imageWithData:imageData];

    UIImage *fixedOrientationImage = [UIImage imageWithCGImage:img.CGImage scale:pickerImg.scale orientation:pickerImg.imageOrientation];
    pickerImg = fixedOrientationImage;

    cropView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width,  self.view.bounds.size.height)];
    cropView.backgroundColor = [UIColor darkTextColor];

    [self.navigationController setNavigationBarHidden:YES animated:YES];

    UIImageView * cropImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width,  self.view.bounds.size.height - 60)];
    cropImageView.image = pickerImg;
    cropImageView.contentMode = UIViewContentModeScaleAspectFit;
    cropImageView.clipsToBounds = YES;

    [cropView addSubview:cropImageView];
    [self.view addSubview:cropView];
}

我选择了下面的图片

像这样在 cropImageView 上方显示

Answer 1

尝试在设置内容模式后设置图像或框架

UIImageView * cropImageView = [[UIImageView alloc] init];
cropImageView.contentMode = UIViewContentModeScaleAspectFit;
cropImageView.frame = CGRectMake(0, 0, self.view.bounds.size.width,  self.view.bounds.size.height - 60);
cropImageView.image = pickerImg;
cropImageView.clipsToBounds = YES;