如何缩放所选图像iPhone sdk？

Question

假设我从图像选择器中选择了图像，现在我想缩放该图像，并希望在按钮或任何图像视图中设置该缩放图像。

Answer 1

您是否看过contentMode的{​​{1}}属性。

UIImageView

Answer 2

当您从选择器中选择图像时，它应返回UIImage类型。只需将其设置为任何UIView子类的图像（按钮也是UIView子类）：

[yourUIImageView setImage:UIImageFronUIPicker];
[yourUIButton setBackgroundImage:UIImageFronUIPicker];

依旧......

Answer 3

在视图控制器中实现UIImagePickerControllerDelegate并实现下面的委托方法

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo {

    [selectedImageBtn setImage:image forState:UIControlStateNormal];
    [[imagePicker parentViewController] dismissModalViewControllerAnimated:YES];

}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [[imagePicker parentViewController] dismissModalViewControllerAnimated:YES];
}